Pub Date : 2024-03-01DOI: 10.1088/0256-307x/41/3/037103
Jianzhi Chen, Aoqian Shi, Yuchen Peng, Peng Peng, Jianjun Liu
Hybrid skin-topological effect (HSTE) in non-Hermitian systems exhibits both the skin effect and topological protection, offering a novel mechanism for localization of topological edge states (TESs) in electrons, circuits, and photons. However, it remains unclear whether the HSTE can be realized in quasicrystals, and the unique structure of quasicrystals with multi-site cells may provide novel localization phenomena for TESs induced by the HSTE. We propose an eight-site cell in two-dimensional quasicrystals and realize the HSTE with eight-site nonreciprocal intracell hoppings. Furthermore, we can arbitrarily adjust the eigenfield distributions of the TESs and discover domain walls associated with effective dissipation and their correlation with localization. We present a new scheme to precisely adjust the energy distribution in non-Hermitian quasicrystals with arbitrary polygonal outer boundaries.
{"title":"Hybrid Skin-Topological Effect Induced by Eight-Site Cells and Arbitrary Adjustment of the Localization of Topological Edge States","authors":"Jianzhi Chen, Aoqian Shi, Yuchen Peng, Peng Peng, Jianjun Liu","doi":"10.1088/0256-307x/41/3/037103","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/037103","url":null,"abstract":"Hybrid skin-topological effect (HSTE) in non-Hermitian systems exhibits both the skin effect and topological protection, offering a novel mechanism for localization of topological edge states (TESs) in electrons, circuits, and photons. However, it remains unclear whether the HSTE can be realized in quasicrystals, and the unique structure of quasicrystals with multi-site cells may provide novel localization phenomena for TESs induced by the HSTE. We propose an eight-site cell in two-dimensional quasicrystals and realize the HSTE with eight-site nonreciprocal intracell hoppings. Furthermore, we can arbitrarily adjust the eigenfield distributions of the TESs and discover domain walls associated with effective dissipation and their correlation with localization. We present a new scheme to precisely adjust the energy distribution in non-Hermitian quasicrystals with arbitrary polygonal outer boundaries.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"21 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1088/0256-307x/41/3/037302
Zhi-Wen Chang, Wei-Chang Hao, Miguel Bustamante, Xin Liu
We propose a method to construct Hopf insulators based on the study of topological defects from the geometric perspective of Hopf invariant I. Firstly, we prove two types of topological defects naturally inhering in the inner differential structure of the Hopf mapping. One type is the four-dimensional point defects, which lead to a topological phase transition occurring at the Dirac points. The other type is the three-dimensional merons, whose topological charges give the evaluations of I. Then, we show two ways to establish the Hopf insulator models. One approach is to modify the locations of merons, thereby the contributions of charges to I will change. The other is related to the number of defects. It is found that I will decrease if the number reduces, while increase if additional defects are added. The method developed in this study is expected to provide a new perspective for understanding the topological invariants, which opens a new door in exploring and designing novel topological materials in three dimensions.
我们从霍普夫不变量 I 的几何视角出发，提出了一种基于拓扑缺陷研究的霍普夫绝缘体构造方法。首先，我们证明了霍普夫映射的内微分结构中自然继承的两类拓扑缺陷。一种是四维点缺陷，它导致在狄拉克点发生拓扑相变。另一类是三维梅龙子，其拓扑电荷给出了 I 的估值。一种方法是改变梅龙子的位置，从而改变电荷对 I 的贡献。另一种方法与缺陷数量有关。研究发现，如果缺陷数量减少，I 会减小，而如果缺陷数量增加，I 会增大。本研究开发的方法有望为理解拓扑不变量提供一个新的视角，为探索和设计新型三维拓扑材料打开一扇新的大门。
{"title":"Constructing Hopf Insulator from Geometric Perspective of Hopf Invariant","authors":"Zhi-Wen Chang, Wei-Chang Hao, Miguel Bustamante, Xin Liu","doi":"10.1088/0256-307x/41/3/037302","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/037302","url":null,"abstract":"We propose a method to construct Hopf insulators based on the study of topological defects from the geometric perspective of Hopf invariant <italic toggle=\"yes\">I</italic>. Firstly, we prove two types of topological defects naturally inhering in the inner differential structure of the Hopf mapping. One type is the four-dimensional point defects, which lead to a topological phase transition occurring at the Dirac points. The other type is the three-dimensional merons, whose topological charges give the evaluations of <italic toggle=\"yes\">I</italic>. Then, we show two ways to establish the Hopf insulator models. One approach is to modify the locations of merons, thereby the contributions of charges to <italic toggle=\"yes\">I</italic> will change. The other is related to the number of defects. It is found that <italic toggle=\"yes\">I</italic> will decrease if the number reduces, while increase if additional defects are added. The method developed in this study is expected to provide a new perspective for understanding the topological invariants, which opens a new door in exploring and designing novel topological materials in three dimensions.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"128 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We report a high-average-power acousto-optic (AO) Q-switched intracavity frequency-doubled red laser based on a high-efficiency light-emitting-diode (LED) pumped two-rod Nd,Ce:YAG laser module. Under quasi-continuous wave operation conditions, a maximum output power of 1319.08 nm wavelength was achieved at 11.26 W at a repetition rate of 100 Hz, corresponding to a maximum optical efficiency of 13.9% and a slope efficiency of 17.9%. In the active Q-switched regime, the pulse energy of the laser was as high as 800 μJ at a repetition rate of 10 kHz with a pulse width of 1.5 μs. Under non-critical phase-matched KTP crystal conditions, an average power of 2.03 W of 658.66 nm through intracavity frequency-doubling was obtained at a repetition frequency of 10 kHz with a duration of 1.3 μs, and the M2 factor was measured to be about 5.8. To the best of our knowledge, this is the highest average power of an LED-pumped AO Q-switched 1319 nm laser and intracavity frequency-doubled red laser reported to date.
{"title":"An LED-Side-Pumped Intracavity Frequency-Doubled Nd,Ce:YAG Laser Producing a 2W Q-Switched Red Beam","authors":"Jianping Shen, Shaocong Xu, Peng LU, Rongrong Jiang, Wei Wang, Siwei Zhang, Fengyang Xing, Yang Chen, Liang Chen","doi":"10.1088/0256-307x/41/3/034201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/034201","url":null,"abstract":"We report a high-average-power acousto-optic (AO) Q-switched intracavity frequency-doubled red laser based on a high-efficiency light-emitting-diode (LED) pumped two-rod Nd,Ce:YAG laser module. Under quasi-continuous wave operation conditions, a maximum output power of 1319.08 nm wavelength was achieved at 11.26 W at a repetition rate of 100 Hz, corresponding to a maximum optical efficiency of 13.9% and a slope efficiency of 17.9%. In the active Q-switched regime, the pulse energy of the laser was as high as 800 μJ at a repetition rate of 10 kHz with a pulse width of 1.5 μs. Under non-critical phase-matched KTP crystal conditions, an average power of 2.03 W of 658.66 nm through intracavity frequency-doubling was obtained at a repetition frequency of 10 kHz with a duration of 1.3 μs, and the <italic toggle=\"yes\">M</italic>\u0000<sup>2</sup> factor was measured to be about 5.8. To the best of our knowledge, this is the highest average power of an LED-pumped AO Q-switched 1319 nm laser and intracavity frequency-doubled red laser reported to date.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"8 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1088/0256-307x/41/3/037104
Bo Li, Xu-Tao Zeng, Qianhui Xu, Fan Yang, Junsen Xiang, Hengyang Zhong, Sihao Deng, Lunhua He, Juping Xu, Wen Yin, Xingye Lu, Huiying Liu, Xian-Lei Sheng, Wentao Jin
Determination of the magnetic structure and confirmation of the presence or absence of inversion (P) and time reversal (T) symmetry is imperative for correctly understanding the topological magnetic materials. Here high-quality single crystals of the layered manganese pnictide CaMnSb2 are synthesized using the self-flux method. De Haas–van Alphen oscillations indicate a nontrivial Berry phase of ∼ π and a notably small cyclotron effective mass, supporting the Dirac semimetal nature of CaMnSb2. Neutron diffraction measurements identify a C-type antiferromagnetic structure below TN = 303(1) K with the Mn moments aligned along the a axis, which is well supported by the density functional theory (DFT) calculations. The corresponding magnetic space group is Pn′m′a′, preserving a P×T symmetry. Adopting the experimentally determined magnetic structure, band crossings near the Y point in momentum space and linear dispersions of the Sb 5py, z bands are revealed by the DFT calculations. Furthermore, our study predicts the possible existence of an intrinsic second-order nonlinear Hall effect in CaMnSb2, offering a promising platform to study the impact of topological properties on nonlinear electrical transports in antiferromagnets.
要正确理解拓扑磁性材料，就必须确定磁性结构并确认是否存在反转（P）和时间反转（T）对称性。在此，我们采用自流式方法合成了层状锰锑化合物 CaMnSb2 的高质量单晶体。德哈斯-范阿尔芬振荡表明，CaMnSb2 的贝里相为 ∼ π，而且回旋有效质量非常小，这支持了 CaMnSb2 的狄拉克半金属性质。中子衍射测量确定了低于 TN = 303(1) K 的 C 型反铁磁结构，锰矩沿 a 轴排列，密度泛函理论（DFT）计算也很好地支持了这一点。相应的磁性空间群为 Pn′m′a′，保持 P×T 对称性。采用实验确定的磁结构，DFT 计算揭示了动量空间 Y 点附近的带交叉和 Sb 5py、z 带的线性色散。此外，我们的研究还预测了 CaMnSb2 中可能存在的内在二阶非线性霍尔效应，为研究拓扑特性对反铁磁体中非线性电传输的影响提供了一个前景广阔的平台。
{"title":"C-Type Antiferromagnetic Structure of Topological Semimetal CaMnSb2","authors":"Bo Li, Xu-Tao Zeng, Qianhui Xu, Fan Yang, Junsen Xiang, Hengyang Zhong, Sihao Deng, Lunhua He, Juping Xu, Wen Yin, Xingye Lu, Huiying Liu, Xian-Lei Sheng, Wentao Jin","doi":"10.1088/0256-307x/41/3/037104","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/037104","url":null,"abstract":"Determination of the magnetic structure and confirmation of the presence or absence of inversion (<inline-formula>\u0000<tex-math>\u0000<?CDATA $mathcal{P}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi mathvariant=\"script\">P</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_3_037104_ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>) and time reversal (<inline-formula>\u0000<tex-math>\u0000<?CDATA $mathcal{T}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi mathvariant=\"script\">T</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_3_037104_ieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>) symmetry is imperative for correctly understanding the topological magnetic materials. Here high-quality single crystals of the layered manganese pnictide CaMnSb<sub>2</sub> are synthesized using the self-flux method. De Haas–van Alphen oscillations indicate a nontrivial Berry phase of ∼ <italic toggle=\"yes\">π</italic> and a notably small cyclotron effective mass, supporting the Dirac semimetal nature of CaMnSb<sub>2</sub>. Neutron diffraction measurements identify a C-type antiferromagnetic structure below <italic toggle=\"yes\">T</italic>\u0000<sub>N</sub> = 303(1) K with the Mn moments aligned along the <italic toggle=\"yes\">a</italic> axis, which is well supported by the density functional theory (DFT) calculations. The corresponding magnetic space group is <italic toggle=\"yes\">Pn</italic>′<italic toggle=\"yes\">m</italic>′<italic toggle=\"yes\">a</italic>′, preserving a <inline-formula>\u0000<tex-math>\u0000<?CDATA $mathcal{P}timesmathcal{T}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:mi mathvariant=\"script\">P</mml:mi><mml:mo>×</mml:mo><mml:mi mathvariant=\"script\">T</mml:mi></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_3_037104_ieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> symmetry. Adopting the experimentally determined magnetic structure, band crossings near the <italic toggle=\"yes\">Y</italic> point in momentum space and linear dispersions of the Sb 5p<sub>\u0000<italic toggle=\"yes\">y</italic>, <italic toggle=\"yes\">z</italic>\u0000</sub> bands are revealed by the DFT calculations. Furthermore, our study predicts the possible existence of an intrinsic second-order nonlinear Hall effect in CaMnSb<sub>2</sub>, offering a promising platform to study the impact of topological properties on nonlinear electrical transports in antiferromagnets.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"141 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1088/0256-307x/41/3/037101
Wenxin Ding, Rong Yu
We construct a new U(1) slave-spin representation for the single-band Hubbard model in the large-U limit. The mean-field theory in this representation is more amenable to describe both the spin-charge-separation physics of the Mott insulator at half-filling and the strange metal behavior at finite doping. By employing a dynamical Green’s function theory for slave spins, we calculate the single-particle spectral function of electrons. The result is comparable to that in dynamical mean field theories. We then formulate a dynamical t/U expansion for the doped Hubbard model that reproduces the mean-field results at the lowest order of expansion. To the next order of expansion, it naturally yields an effective low-energy theory of a t–J model for spinons self-consistently coupled to an XXZ model for the slave spins. We show that the superexchange J is renormalized by doping, in agreement with the Gutzwiller approximation. Surprisingly, we find a new ferromagnetic channel of exchange interactions which survives in the infinite U limit, as a manifestation of the Nagaoka ferromagnetism.
{"title":"Dynamical t/U Expansion of the Doped Hubbard Model","authors":"Wenxin Ding, Rong Yu","doi":"10.1088/0256-307x/41/3/037101","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/037101","url":null,"abstract":"We construct a new <italic toggle=\"yes\">U</italic>(1) slave-spin representation for the single-band Hubbard model in the large-<italic toggle=\"yes\">U</italic> limit. The mean-field theory in this representation is more amenable to describe both the spin-charge-separation physics of the Mott insulator at half-filling and the strange metal behavior at finite doping. By employing a dynamical Green’s function theory for slave spins, we calculate the single-particle spectral function of electrons. The result is comparable to that in dynamical mean field theories. We then formulate a dynamical <italic toggle=\"yes\">t</italic>/<italic toggle=\"yes\">U</italic> expansion for the doped Hubbard model that reproduces the mean-field results at the lowest order of expansion. To the next order of expansion, it naturally yields an effective low-energy theory of a <italic toggle=\"yes\">t</italic>–<italic toggle=\"yes\">J</italic> model for spinons self-consistently coupled to an <italic toggle=\"yes\">XXZ</italic> model for the slave spins. We show that the superexchange <italic toggle=\"yes\">J</italic> is renormalized by doping, in agreement with the Gutzwiller approximation. Surprisingly, we find a new <italic toggle=\"yes\">ferromagnetic</italic> channel of exchange interactions which survives in the infinite <italic toggle=\"yes\">U</italic> limit, as a manifestation of the Nagaoka ferromagnetism.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"45 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311140","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1088/0256-307x/41/3/033201
Yiwen Han, Wei Yi
We demonstrate the flexible tunability of excitation transport in Rydberg atoms, under the interplay of controlled dissipation and interaction-induced synthetic flux. Considering a minimum four-site setup, i.e., a triangular configuration with an additional output site, we study the transport of a single excitation, injected into a vertex of the triangle, through the structure. While the long-range dipole-dipole interactions between the Rydberg atoms lead to geometry-dependent Peierls phases in the hopping amplitudes of excitations, we further introduce on-site dissipation to a vertex of the triangle. As a result, both the chirality and destination of the transport can be manipulated through the flux and dissipation. In particular, we illustrate a parameter regime where our Rydberg-ring structure may serve as a switch for transporting the injected excitation through to the output site. The underlying mechanism is then analyzed by studying the chiral trajectory of the excitation and the time-dependent dissipation. The switchable excitation transport reported here offers a flexible tool for quantum control in Rydberg atoms, and holds interesting potentials for applications in quantum simulation and quantum information.
{"title":"Tuning Excitation Transport in a Dissipative Rydberg Ring","authors":"Yiwen Han, Wei Yi","doi":"10.1088/0256-307x/41/3/033201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/033201","url":null,"abstract":"We demonstrate the flexible tunability of excitation transport in Rydberg atoms, under the interplay of controlled dissipation and interaction-induced synthetic flux. Considering a minimum four-site setup, i.e., a triangular configuration with an additional output site, we study the transport of a single excitation, injected into a vertex of the triangle, through the structure. While the long-range dipole-dipole interactions between the Rydberg atoms lead to geometry-dependent Peierls phases in the hopping amplitudes of excitations, we further introduce on-site dissipation to a vertex of the triangle. As a result, both the chirality and destination of the transport can be manipulated through the flux and dissipation. In particular, we illustrate a parameter regime where our Rydberg-ring structure may serve as a switch for transporting the injected excitation through to the output site. The underlying mechanism is then analyzed by studying the chiral trajectory of the excitation and the time-dependent dissipation. The switchable excitation transport reported here offers a flexible tool for quantum control in Rydberg atoms, and holds interesting potentials for applications in quantum simulation and quantum information.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Semiconductor nanowires coupled to a superconductor provide a powerful testbed for quantum device physics such as Majorana zero modes and gate-tunable hybrid qubits. The performance of these quantum devices heavily relies on the quality of the induced superconducting gap. A hard gap, evident as vanishing subgap conductance in tunneling spectroscopy, is both necessary and desired. A hard gap has been achieved and extensively studied before in III–V semiconductor nanowires (InAs and InSb). In this study, we present the observation of a hard superconducting gap in PbTe nanowires coupled to a superconductor Pb. The gap size Δ is ∼ 1 meV (maximally 1.3 meV in one device). Additionally, subgap Andreev bound states can also be created and controlled through gate tuning. Tuning a device into the open regime can reveal Andreev enhancement of the subgap conductance. These results pave the way for diverse superconducting quantum devices based on PbTe nanowires.
{"title":"Hard Superconducting Gap in PbTe Nanowires","authors":"Yichun Gao, Wenyu Song, Shuai Yang, Zehao Yu, Ruidong Li, Wentao Miao, Yuhao Wang, Fangting Chen, Zuhan Geng, Lining Yang, Zezhou Xia, Xiao Feng, Yunyi Zang, Lin Li, Runan Shang, Qi-Kun Xue, Ke He, Hao Zhang","doi":"10.1088/0256-307x/41/3/038502","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/038502","url":null,"abstract":"Semiconductor nanowires coupled to a superconductor provide a powerful testbed for quantum device physics such as Majorana zero modes and gate-tunable hybrid qubits. The performance of these quantum devices heavily relies on the quality of the induced superconducting gap. A hard gap, evident as vanishing subgap conductance in tunneling spectroscopy, is both necessary and desired. A hard gap has been achieved and extensively studied before in III–V semiconductor nanowires (InAs and InSb). In this study, we present the observation of a hard superconducting gap in PbTe nanowires coupled to a superconductor Pb. The gap size <italic toggle=\"yes\">Δ</italic> is ∼ 1 meV (maximally 1.3 meV in one device). Additionally, subgap Andreev bound states can also be created and controlled through gate tuning. Tuning a device into the open regime can reveal Andreev enhancement of the subgap conductance. These results pave the way for diverse superconducting quantum devices based on PbTe nanowires.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"142 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1088/0256-307x/41/3/031301
Pan-Pan Shi, Vadim Baru, Feng-Kun Guo, Christoph Hanhart, Alexey Nefediev
In 2021, the Belle collaboration reported the first observation of a new structure in the ψ(2S)γ final state produced in the two-photon fusion process. In the hadronic molecule picture, this new structure can be associated with the shallow isoscalar D*D¯* bound state and as such is an excellent candidate for the spin-2 partner of the X(3872) with the quantum numbers JPC = 2++ conventionally named X2. In this work we evaluate the electronic width of this new state and argue that its nature is sensitive to its total width, the experimental measurement currently available being unable to distinguish between different options. Our estimates demonstrate that the planned Super τ-Charm Facility offers a promising opportunity to search for and study this new state in the invariant mass distributions for the final states J/ψγ and ψ(2S)γ.
{"title":"Production of the X(4014) as the Spin-2 Partner of X(3872) in e + e − Collisions","authors":"Pan-Pan Shi, Vadim Baru, Feng-Kun Guo, Christoph Hanhart, Alexey Nefediev","doi":"10.1088/0256-307x/41/3/031301","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/031301","url":null,"abstract":"In 2021, the Belle collaboration reported the first observation of a new structure in the <italic toggle=\"yes\">ψ</italic>(2<italic toggle=\"yes\">S</italic>)<italic toggle=\"yes\">γ</italic> final state produced in the two-photon fusion process. In the hadronic molecule picture, this new structure can be associated with the shallow isoscalar <inline-formula>\u0000<tex-math>\u0000<?CDATA ${D}^{* }{overline{D}}^{* }$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msup><mml:mi>D</mml:mi><mml:mo>*</mml:mo></mml:msup><mml:msup><mml:mover accent=\"true\"><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo>*</mml:mo></mml:msup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_3_031301_ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> bound state and as such is an excellent candidate for the spin-2 partner of the <italic toggle=\"yes\">X</italic>(3872) with the quantum numbers <italic toggle=\"yes\">J</italic>\u0000<sup>PC</sup> = 2<sup>++</sup> conventionally named <italic toggle=\"yes\">X</italic>\u0000<sub>2</sub>. In this work we evaluate the electronic width of this new state and argue that its nature is sensitive to its total width, the experimental measurement currently available being unable to distinguish between different options. Our estimates demonstrate that the planned Super <italic toggle=\"yes\">τ</italic>-Charm Facility offers a promising opportunity to search for and study this new state in the invariant mass distributions for the final states <italic toggle=\"yes\">J</italic>/<italic toggle=\"yes\">ψγ</italic> and <italic toggle=\"yes\">ψ</italic>(2<italic toggle=\"yes\">S</italic>)<italic toggle=\"yes\">γ</italic>.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.1088/0256-307x/41/3/037303
Zhe Sun, Donglai Feng
Synchrotron radiation has transformed the role of x-rays as a mainstream tool for probing the atomic and electronic structure of materials. Synchrotron-based x-ray sciences have been widely used to study the microscopic structure, electronic states, chemical composition, and other properties of materials in fields such as quantum materials, soft matter, energy storage, catalysis, biology, and electronics.
同步辐射改变了 X 射线的角色，使其成为探测材料原子和电子结构的主流工具。基于同步加速器的 X 射线科学已被广泛用于研究材料的微观结构、电子状态、化学成分和其他特性，涉及领域包括量子材料、软物质、能量存储、催化、生物和电子学。
{"title":"Opportunities of Advanced Physical Studies at the Hefei Advanced Light Facility","authors":"Zhe Sun, Donglai Feng","doi":"10.1088/0256-307x/41/3/037303","DOIUrl":"https://doi.org/10.1088/0256-307x/41/3/037303","url":null,"abstract":"Synchrotron radiation has transformed the role of x-rays as a mainstream tool for probing the atomic and electronic structure of materials. Synchrotron-based x-ray sciences have been widely used to study the microscopic structure, electronic states, chemical composition, and other properties of materials in fields such as quantum materials, soft matter, energy storage, catalysis, biology, and electronics.","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140311342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.1088/0256-307x/41/2/021302
Cheng Chen, Bing Yan, Ju-Jun Xie
Within the extended vector meson dominance model, we investigate the <inline-formula> <tex-math> <?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?> </tex-math> <mml:math overflow="scroll"><mml:mrow><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msubsup><mml:mover accent="true"><mml:mi>Λ</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>c</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:mrow></mml:math> <inline-graphic xlink:href="cpl_41_2_021302_ieqn5.gif" xlink:type="simple"></inline-graphic> </inline-formula> reaction and the electromagnetic form factors of the charmed baryon <inline-formula> <tex-math> <?CDATA ${varLambda }_{c}^{+}$?> </tex-math> <mml:math overflow="scroll"><mml:mrow><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:mrow></mml:math> <inline-graphic xlink:href="cpl_41_2_021302_ieqn6.gif" xlink:type="simple"></inline-graphic> </inline-formula>. The model parameters are determined by fitting them to the cross sections of the process <inline-formula> <tex-math> <?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?> </tex-math> <mml:math overflow="scroll"><mml:mrow><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msubsup><mml:mover accent="true"><mml:mi>Λ</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>c</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:mrow></mml:math> <inline-graphic xlink:href="cpl_41_2_021302_ieqn7.gif" xlink:type="simple"></inline-graphic> </inline-formula> and the magnetic form factor |<italic toggle="yes">G</italic> <sub>M</sub>| of <inline-formula> <tex-math> <?CDATA ${varLambda }_{c}^{+}$?> </tex-math> <mml:math overflow="scroll"><mml:mrow><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:mrow></mml:math> <inline-graphic xlink:href="cpl_41_2_021302_ieqn8.gif" xlink:type="simple"></inline-graphic> </inline-formula>. By considering four charmonium-like states, called <italic toggle="yes">ψ</italic>(4500), <italic toggle="yes">ψ</italic>(4660), <italic toggle="yes">ψ</italic>(4790), and <italic toggle="yes">ψ</italic>(4900), we can well describe the current data on the <inline-formula> <tex-math> <?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?> </tex-math> <mml:math overflow="scroll"><mml:mrow><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msubsup><mml:mover accent="true"><mml:mi>Λ</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>c</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:mrow>
{"title":"e+e−→Λc+Λ¯c− Cross Sections and the Λc+ Electromagnetic Form Factors within the Extended Vector Meson Dominance Model","authors":"Cheng Chen, Bing Yan, Ju-Jun Xie","doi":"10.1088/0256-307x/41/2/021302","DOIUrl":"https://doi.org/10.1088/0256-307x/41/2/021302","url":null,"abstract":"Within the extended vector meson dominance model, we investigate the <inline-formula>\u0000<tex-math>\u0000<?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msubsup><mml:mover accent=\"true\"><mml:mi>Λ</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>c</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_2_021302_ieqn5.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> reaction and the electromagnetic form factors of the charmed baryon <inline-formula>\u0000<tex-math>\u0000<?CDATA ${varLambda }_{c}^{+}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_2_021302_ieqn6.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. The model parameters are determined by fitting them to the cross sections of the process <inline-formula>\u0000<tex-math>\u0000<?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msubsup><mml:mover accent=\"true\"><mml:mi>Λ</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>c</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_2_021302_ieqn7.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> and the magnetic form factor |<italic toggle=\"yes\">G</italic>\u0000<sub>M</sub>| of <inline-formula>\u0000<tex-math>\u0000<?CDATA ${varLambda }_{c}^{+}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup></mml:mrow></mml:math>\u0000<inline-graphic xlink:href=\"cpl_41_2_021302_ieqn8.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. By considering four charmonium-like states, called <italic toggle=\"yes\">ψ</italic>(4500), <italic toggle=\"yes\">ψ</italic>(4660), <italic toggle=\"yes\">ψ</italic>(4790), and <italic toggle=\"yes\">ψ</italic>(4900), we can well describe the current data on the <inline-formula>\u0000<tex-math>\u0000<?CDATA ${e}^{+}{e}^{-}to {varLambda }_{c}^{+}{bar{varLambda }}_{c}^{-}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mrow><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msubsup><mml:mover accent=\"true\"><mml:mi>Λ</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>c</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:mrow>","PeriodicalId":10344,"journal":{"name":"Chinese Physics Letters","volume":"176 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139762292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：