Manipulating magnetic domain structure plays a key role in advanced spintronics devices. Theoretical rationale is that the labyrinthine domain structure, normally appearing in ferromagnetic thin films with strong magnetic anisotropy, shows a great potential to increase data storage density for designing magnetic nonvolatile memory and logic devices. However, an electrical control of labyrinthine domain structure remains elusive. Here, we demonstrate the gate-driven evolution of labyrinthine domain structures in an itinerant ferromagnet Cr7Te8. By combining electric transport measurements and micromagnetic finite difference simulations, we found that the hysteresis loop of anomalous Hall effect in Cr7Te8 samples shows distinct features corresponding to the generation of labyrinthine domain structures. The labyrinthine domain structures are found to be electrically tunable via Li-electrolyte gating, and such gate-driven evolution in Cr7Te8 originates from the reduction of the magnetic anisotropic energy with gating, revealed by our micromagnetic simulations. Our results on the gate control of anomalous Hall effect in an itinerant magnetic material provide an opportunity to understand the formation and evolution of labyrinthine domain structures, paving a new route towards electric-field driven spintronics.
{"title":"Gate Tunable Labyrinth Domain Structures in a van der Waals Itinerant Ferromagnet Cr7Te8","authors":"Kui Meng, Zeya Li, Yicheng Shen, Xiangyu Bi, Junhao Rao, Yuting Qian, Zhansheng Gao, Peng Chen, Caiyu Qiu, Feng Qin, Jinxiong Wu, Feng Luo, Junwei Huang, Hongtao Yuan","doi":"10.1088/0256-307x/41/9/097501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/9/097501","url":null,"abstract":"\u0000 Manipulating magnetic domain structure plays a key role in advanced spintronics devices. Theoretical rationale is that the labyrinthine domain structure, normally appearing in ferromagnetic thin films with strong magnetic anisotropy, shows a great potential to increase data storage density for designing magnetic nonvolatile memory and logic devices. However, an electrical control of labyrinthine domain structure remains elusive. Here, we demonstrate the gate-driven evolution of labyrinthine domain structures in an itinerant ferromagnet Cr7Te8. By combining electric transport measurements and micromagnetic finite difference simulations, we found that the hysteresis loop of anomalous Hall effect in Cr7Te8 samples shows distinct features corresponding to the generation of labyrinthine domain structures. The labyrinthine domain structures are found to be electrically tunable via Li-electrolyte gating, and such gate-driven evolution in Cr7Te8 originates from the reduction of the magnetic anisotropic energy with gating, revealed by our micromagnetic simulations. Our results on the gate control of anomalous Hall effect in an itinerant magnetic material provide an opportunity to understand the formation and evolution of labyrinthine domain structures, paving a new route towards electric-field driven spintronics.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"31 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141927189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1088/0256-307x/41/8/084203
Zhen-Tao Ju, Zhi-Zeng Si, Xin Yan, Chao-Qing Dai
The carbon black (CB) is introduced to manufacture CB/graphene oxide (GO) composite material to mitigate limitations of GO as a saturable absorber with the excellent performance in ultrafast fiber lasers. At a central wavelength of 1555.5 nm, the stable mode-locked pulse with the width of 656 fs, a repetition rate of 20.16 MHz, and a high signal-to-noise ratio of 82.07 dB is experimentally obtained. Additionally, experimental observations for pulsation phenomena of vector biperiodic solitons combining period-1 and period-17, period-2 and period-32, period-3 and period-36, are verified through simulations.
{"title":"Solitons and Their Biperiodic Pulsation in Ultrafast Fiber Lasers Based on CB/GO","authors":"Zhen-Tao Ju, Zhi-Zeng Si, Xin Yan, Chao-Qing Dai","doi":"10.1088/0256-307x/41/8/084203","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/084203","url":null,"abstract":"\u0000 The carbon black (CB) is introduced to manufacture CB/graphene oxide (GO) composite material to mitigate limitations of GO as a saturable absorber with the excellent performance in ultrafast fiber lasers. At a central wavelength of 1555.5 nm, the stable mode-locked pulse with the width of 656 fs, a repetition rate of 20.16 MHz, and a high signal-to-noise ratio of 82.07 dB is experimentally obtained. Additionally, experimental observations for pulsation phenomena of vector biperiodic solitons combining period-1 and period-17, period-2 and period-32, period-3 and period-36, are verified through simulations.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"60 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141643537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-16DOI: 10.1088/0256-307x/41/8/081401
Jean-Marc Richard
We review the predictions of quark models for multiquark configurations that are bound or resonant states, and compare different methods for estimating the properties of resonances.
我们回顾了夸克模型对束缚态或共振态多夸克构型的预测，并比较了估算共振特性的不同方法。
{"title":"Bound and resonating multiquark configurations","authors":"Jean-Marc Richard","doi":"10.1088/0256-307x/41/8/081401","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/081401","url":null,"abstract":"\u0000 We review the predictions of quark models for multiquark configurations that are bound or resonant states, and compare different methods for estimating the properties of resonances.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"1 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141642704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-10DOI: 10.1088/0256-307x/41/8/087402
Yidian Li, Xian Du, Yantao Cao, C. Pei, Mingxin Zhang, Wenxuan Zhao, Kaiyi Zhai, R. Xu, Zhongkai Liu, Zhiwei Li, Jinkui Zhao, Gang Li, Y. Qi, Hanjie Guo, Yulin Chen, Lexian Yang
High-temperature superconductivity (HTSC) remains one of the most challenging and fascinating mysteries in condensed matter physics. Recently, superconductivity with transition temperature exceeding liquid-nitrogen temperature is discovered in La3Ni2O7 at high pressure, which provides a new platform to explore the unconventional HTSC. In this work, using high-resolution angle-resolved photoemission spectroscopy and ab-initio calculation, we systematically investigate the electronic structures of La3Ni2O7 at ambient pressure. Our experiments are in nice agreement with ab-initio calculations after considering an orbital-dependent band renormalization effect. The strong electron correlation effect pushes a flat band of d z 2 orbital component below the Fermi level (E F), which is predicted to locate right at E F under high pressure. Moreover, the d x 2-y 2 band shows a pseudogap-like behavior with suppressed spectral weight and diminished quasiparticle peak near E F. Our findings provide important insights into the electronic structure of La3Ni2O7, which will shed light on the understanding of the unconventional superconductivity in nickelates.
高温超导（HTSC）仍然是凝聚态物理学中最具挑战性和最迷人的谜团之一。最近，在高压下的 La3Ni2O7 中发现了转变温度超过液氮温度的超导电性，这为探索非常规 HTSC 提供了一个新平台。在这项工作中，我们利用高分辨率角度分辨光发射光谱和原子量计算，系统地研究了常压下 La3Ni2O7 的电子结构。在考虑了轨道相关的能带重正化效应后，我们的实验结果与常量计算结果非常吻合。强电子相关效应将 d z 2 轨道分量的平带推至费米级（E F）以下，预计在高压下该平带将位于 E F 处。此外，d x 2-y 2 带显示出类似伪缺口的行为，其光谱重量被抑制，准粒子峰值在 E F 附近减小。我们的发现为了解 La3Ni2O7 的电子结构提供了重要启示，这将有助于理解镍酸盐的非传统超导性。
{"title":"Electronic Correlation and Pseudogap-like Behavior of High-Temperature Superconductor La3Ni2O7","authors":"Yidian Li, Xian Du, Yantao Cao, C. Pei, Mingxin Zhang, Wenxuan Zhao, Kaiyi Zhai, R. Xu, Zhongkai Liu, Zhiwei Li, Jinkui Zhao, Gang Li, Y. Qi, Hanjie Guo, Yulin Chen, Lexian Yang","doi":"10.1088/0256-307x/41/8/087402","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/087402","url":null,"abstract":"\u0000 High-temperature superconductivity (HTSC) remains one of the most challenging and fascinating mysteries in condensed matter physics. Recently, superconductivity with transition temperature exceeding liquid-nitrogen temperature is discovered in La3Ni2O7 at high pressure, which provides a new platform to explore the unconventional HTSC. In this work, using high-resolution angle-resolved photoemission spectroscopy and ab-initio calculation, we systematically investigate the electronic structures of La3Ni2O7 at ambient pressure. Our experiments are in nice agreement with ab-initio calculations after considering an orbital-dependent band renormalization effect. The strong electron correlation effect pushes a flat band of d\u0000 \u0000 z\u0000 2\u0000 orbital component below the Fermi level (E\u0000 F), which is predicted to locate right at E\u0000 F under high pressure. Moreover, the d\u0000 \u0000 x\u0000 2-y\u0000 2\u0000 band shows a pseudogap-like behavior with suppressed spectral weight and diminished quasiparticle peak near E\u0000 F. Our findings provide important insights into the electronic structure of La3Ni2O7, which will shed light on the understanding of the unconventional superconductivity in nickelates.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"47 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141660096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The discovery of ferroelectricity in HfO2-based materials with high dielectric constant has inspired tremendous research interest for next-generation electronic devices. Importantly, films structure and strain are key factors in the exploration of ferroelectricity in the fluorite-type oxide HfO2 films. Here we have investigated the structures and strain-induced ferroelectric transition in the different phases of few-layer HfO2 films (layer number N=1-5). It is found that HfO2 films for all phases are more stable with increasing films thickness. Among them, the Pmn2 1 (110)-oriented film is the most stable, and the films of N=4, 5 occur a P2 1 ferroelectric transition under tensile strain, resulting in polarization about 11.8 μC/cm2 along in-plane a-axis. The ferroelectric transition is caused by the strain, which induces the displacement of Hf and O atoms on the surface to non-centrosymmetric positions away from the original paraelectric positions, accompanied by the change of surface Hf-O bond lengths. More importantly, three new stable HfO2 2D structures are discovered, together with computed electronic structures, mechanical, and dielectric properties analyses. This work provides guidance for theoretical and experimental study of the new structures and strain-tuned ferroelectricity in freestanding HfO2 films.
{"title":"Structural and ferroelectric transition in few-layer HfO2 films from first principles","authors":"Ruiling Gao, Chao Liu, Bowen Shi, Yongchang Li, Bing Luo, Rui Chen, Wen-Ze Ouyang, Heng Gao, Shunbo Hu, Yin Wang, Dongdong Li, Wei Ren","doi":"10.1088/0256-307x/41/8/087701","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/087701","url":null,"abstract":"\u0000 The discovery of ferroelectricity in HfO2-based materials with high dielectric constant has inspired tremendous research interest for next-generation electronic devices. Importantly, films structure and strain are key factors in the exploration of ferroelectricity in the fluorite-type oxide HfO2 films. Here we have investigated the structures and strain-induced ferroelectric transition in the different phases of few-layer HfO2 films (layer number N=1-5). It is found that HfO2 films for all phases are more stable with increasing films thickness. Among them, the Pmn2\u0000 \u0000 1\u0000 (110)-oriented film is the most stable, and the films of N=4, 5 occur a P2\u0000 \u0000 1\u0000 ferroelectric transition under tensile strain, resulting in polarization about 11.8 μC/cm2 along in-plane a-axis. The ferroelectric transition is caused by the strain, which induces the displacement of Hf and O atoms on the surface to non-centrosymmetric positions away from the original paraelectric positions, accompanied by the change of surface Hf-O bond lengths. More importantly, three new stable HfO2 2D structures are discovered, together with computed electronic structures, mechanical, and dielectric properties analyses. This work provides guidance for theoretical and experimental study of the new structures and strain-tuned ferroelectricity in freestanding HfO2 films.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"45 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141664819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-09DOI: 10.1088/0256-307x/41/8/080501
T. Belyaeva, V. Serkin
The main goal of our article is to reveal unexpected but intriguing analogies arising between optical solitons and nuclear physics, which still remain hidden from us. We consider the main cornerstones of the concept of nonlinear optics of nuclear reactions and the well-dressed repulsive-core solitons. On the base of this model, we reveal the most intriguing properties of the nonlinear tunneling of nucleus-like solitons and the soliton selfinduced sub-barrier transparency effect. We describe novel interesting and stimulating analogies between the interaction of nucleus-like solitons on the repulsive barrier and nuclear sub-barrier reactions. The main finding of our study concerns the conservation of total number of nucleons (or the baryon number) in nuclear-like soliton reactions. We show that inelastic interactions among well-dressed repulsive-core solitons arise only when a “cloud” of “dressing” spectral side-bands appears in the frequency spectra of the solitons. This property of nucleus-like solitons is directly related to the nuclear density distribution described by the dimensionless small shape-squareness parameter. Thus the Fourier spectra of nucleus-like solitons are similar to the nuclear form factors. We show that the nuclear-like reactions between well-dressed solitons are realized by “exchange” between “particle-like” side-bands in their spectra.
{"title":"Nonlinear-optical analogies in nuclear-like soliton reactions: selection rules, nonlinear tunneling and sub-barrier fusion-fission","authors":"T. Belyaeva, V. Serkin","doi":"10.1088/0256-307x/41/8/080501","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/080501","url":null,"abstract":"\u0000 The main goal of our article is to reveal unexpected but intriguing analogies arising between optical solitons and nuclear physics, which still remain hidden from us. We consider the main cornerstones of the concept of nonlinear optics of nuclear reactions and the well-dressed repulsive-core solitons. On the base of this model, we reveal the most intriguing properties of the nonlinear tunneling of nucleus-like solitons and the soliton selfinduced sub-barrier transparency effect. We describe novel interesting and stimulating analogies between the interaction of nucleus-like solitons on the repulsive barrier and nuclear sub-barrier reactions. The main finding of our study concerns the conservation of total number of nucleons (or the baryon number) in nuclear-like soliton reactions. We show that inelastic interactions among well-dressed repulsive-core solitons arise only when a “cloud” of “dressing” spectral side-bands appears in the frequency spectra of the solitons. This property of nucleus-like solitons is directly related to the nuclear density distribution described by the dimensionless small shape-squareness parameter. Thus the Fourier spectra of nucleus-like solitons are similar to the nuclear form factors. We show that the nuclear-like reactions between well-dressed solitons are realized by “exchange” between “particle-like” side-bands in their spectra.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"119 46","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141665297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-05DOI: 10.1088/0256-307x/41/8/085201
Changzhi Jiang, Shunwen Wang, Zhenyu Zhou, Di Hu, Bo Li, Jorek team
Tokamak plasmas with elongated cross-sections are susceptible to Vertical Displacement Events (VDEs), which can damage the first wall via heat flux or electromagnetic (EM) forces. We present a 3D nonlinear reduced MHD simulation of CFETR plasma during a cold VDE following the thermal quench, focusing on the relationship between the EM force, plasma displacement, and the n = 1 mode. The dominant mode, identified as m/n = 2/1, becomes destabilized when most of the current is contracted within the q = 2 surface. The displacement of the plasma current centroid is less than that of the magnetic axis due to the presence of SOL current in the open field line region. Hence, the symmetric component of the induced vacuum vessel current is significantly mitigated. The direction of the sideways force keeps a constant phase approximately compared with the asymmetric component of the vacuum vessel current and the SOL current, which in turn keep in-phase with the dominant 2/1 mode, respectively. Their amplitudes are also closely associated with the growth of the dominant mode. These findings provide insights into potential methods for controlling the phase and amplitude of sideways forces during VDEs in the future.
具有细长横截面的托卡马克等离子体很容易受到垂直位移事件（VDE）的影响，这种事件会通过热通量或电磁（EM）力损坏第一壁。我们介绍了热淬火后冷 VDE 期间 CFETR 等离子体的三维非线性还原 MHD 仿真，重点研究了电磁力、等离子体位移和 n = 1 模式之间的关系。当大部分电流收缩在 q = 2 表面内时，主导模式（m/n = 2/1）会变得不稳定。由于开放场线区域存在 SOL 电流，等离子体电流中心点的位移小于磁轴的位移。因此，诱导真空容器电流的对称分量明显减弱。与真空容器电流和 SOL 电流的非对称分量相比，侧向力的方向保持近似恒定的相位。它们的振幅也与主导模式的增长密切相关。这些发现为今后控制 VDE 期间侧向力的相位和振幅的潜在方法提供了启示。
{"title":"Simulation of rotating asymmetric sideways forces during Vertical Displacement Events in CFETR","authors":"Changzhi Jiang, Shunwen Wang, Zhenyu Zhou, Di Hu, Bo Li, Jorek team","doi":"10.1088/0256-307x/41/8/085201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/085201","url":null,"abstract":"\u0000 Tokamak plasmas with elongated cross-sections are susceptible to Vertical Displacement Events (VDEs), which can damage the first wall via heat flux or electromagnetic (EM) forces. We present a 3D nonlinear reduced MHD simulation of CFETR plasma during a cold VDE following the thermal quench, focusing on the relationship between the EM force, plasma displacement, and the n = 1 mode. The dominant mode, identified as m/n = 2/1, becomes destabilized when most of the current is contracted within the q = 2 surface. The displacement of the plasma current centroid is less than that of the magnetic axis due to the presence of SOL current in the open field line region. Hence, the symmetric component of the induced vacuum vessel current is significantly mitigated. The direction of the sideways force keeps a constant phase approximately compared with the asymmetric component of the vacuum vessel current and the SOL current, which in turn keep in-phase with the dominant 2/1 mode, respectively. Their amplitudes are also closely associated with the growth of the dominant mode. These findings provide insights into potential methods for controlling the phase and amplitude of sideways forces during VDEs in the future.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 40","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141675925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-07-04DOI: 10.1088/0256-307x/41/8/087101
Dengfeng Wang, Yingda Chen, ZhiChuan Niu, W. Lou, Kai Chang
Based on the Gross-Pitaevskii equation, we theoretically investigate exciton Bose-Einstein condensation (BEC) in transition metal dichalcogenide monolayers (TMDC-MLs) under in-plane magnetic fields. We observe that the in-plane magnetic fields exert a strong influence on the exciton BEC wave functions in TMDC-MLs because of the mixing of the bright and dark exciton states via Zeeman effect. This leads to the brightening of the dark exciton BEC states. The competition between the dipole-dipole interactions (DDI) caused by the long-range Coulomb interaction and the Zeeman effect induced by the in-plane magnetic fields can effectively regulate dark exciton BEC states. Our findings emphasize the utility of TMD-MLs as platforms for investigating collective phenomenon involving excited states.
{"title":"Exciton Bose-Einstein condensation in transition metal dichalcogenide monolayer under in-plane magnetic fields","authors":"Dengfeng Wang, Yingda Chen, ZhiChuan Niu, W. Lou, Kai Chang","doi":"10.1088/0256-307x/41/8/087101","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/087101","url":null,"abstract":"\u0000 Based on the Gross-Pitaevskii equation, we theoretically investigate exciton Bose-Einstein condensation (BEC) in transition metal dichalcogenide monolayers (TMDC-MLs) under in-plane magnetic fields. We observe that the in-plane magnetic fields exert a strong influence on the exciton BEC wave functions in TMDC-MLs because of the mixing of the bright and dark exciton states via Zeeman effect. This leads to the brightening of the dark exciton BEC states. The competition between the dipole-dipole interactions (DDI) caused by the long-range Coulomb interaction and the Zeeman effect induced by the in-plane magnetic fields can effectively regulate dark exciton BEC states. Our findings emphasize the utility of TMD-MLs as platforms for investigating collective phenomenon involving excited states.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141678055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Terahertz heterodyne receivers with high sensitivity and spectral resolution are crucial for various applications. Here, we present a room-temperature atomic terahertz heterodyne receiver that achieves ultrahigh sensitivity and frequency resolution. At a signal frequency of 338.7 GHz, we obtained a sensitivity of 2.88±0.09 µVcm-1Hz-1/2 for electric field measurements. The calibrated linear dynamical range spans approximately 89 dB, ranging from -110 dBV/cm to -21 dBV/cm. We demodulate a 400 symbol stream encoded in 4-state phase-shift keying, demonstrating excellent phase detection capability. By scanning the frequency of the local oscillator, we realized a terahertz spectrometer with Hz level frequency resolution. This resolution is more than two orders of magnitude higher than that of existing terahertz spectrometers. The demonstrated terahertz heterodyne receiver holds promising potential for working across the entire terahertz spectrum, significantly advancing its practical applications.
{"title":"Rydberg-atom terahertz heterodyne receiver with ultrahigh spectral resolution","authors":"Zhen-Yue She, Xiaojie Zhu, Ya-Yi Lin, Xianzhe Li, Xiaolin Yang, Yanfei Shang, Yuqin Teng, Haitao Tu, Kaiyu Liao, Caixia Zhang, Xiaohong Liu, Jiehua Chen, Wei Huang","doi":"10.1088/0256-307x/41/8/084201","DOIUrl":"https://doi.org/10.1088/0256-307x/41/8/084201","url":null,"abstract":"\u0000 Terahertz heterodyne receivers with high sensitivity and spectral resolution are crucial for various applications. Here, we present a room-temperature atomic terahertz heterodyne receiver that achieves ultrahigh sensitivity and frequency resolution. At a signal frequency of 338.7 GHz, we obtained a sensitivity of 2.88±0.09 µVcm-1Hz-1/2 for electric field measurements. The calibrated linear dynamical range spans approximately 89 dB, ranging from -110 dBV/cm to -21 dBV/cm. We demodulate a 400 symbol stream encoded in 4-state phase-shift keying, demonstrating excellent phase detection capability. By scanning the frequency of the local oscillator, we realized a terahertz spectrometer with Hz level frequency resolution. This resolution is more than two orders of magnitude higher than that of existing terahertz spectrometers. The demonstrated terahertz heterodyne receiver holds promising potential for working across the entire terahertz spectrum, significantly advancing its practical applications.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":" 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141678049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Exploration of exotic phenomena in magnetic topological systems is at the frontier of condensed matter physics, holding a significant promise for the applications in topological spintronics. However, complex magnetic structures carrying nontrivial topological properties hinder its progresses. Here, we investigate the pressure effect on the novel topological kagome magnets GdV6Sn6 and TbV6Sn6 to dig out the interplay between magnetic Gd/Tb layers and nonmagnetic V-based kagome sublattice. The pressure-tuned magnetic transition temperature T m in both compounds exhibit a turning point at the critical pressure P c, accompanying with a sign reversal in anomalous Hall effect (AHE). The separation of intrinsic and extrinsic contributions using the TYJ scaling model suggests that the intrinsic mechanism originating from the electronic Berry curvature holds the priority in the competition with extrinsic mechanism in AHE. Above findings can be attributed to the combined effect of pressure-tuned band topology and magnetic interaction in segregated layers. Our results provide a practical route to design and manipulate the intrinsic AHE in magnetic topological materials.
探索磁拓扑系统中的奇异现象是凝聚态物理学的前沿领域，为拓扑自旋电子学的应用带来了巨大希望。然而，带有非对称拓扑特性的复杂磁结构阻碍了它的发展。在此，我们研究了压力对新型拓扑卡戈米磁体 GdV6Sn6 和 TbV6Sn6 的影响，以挖掘磁性 Gd/Tb 层与非磁性 V 基卡戈米亚晶格之间的相互作用。这两种化合物的压力调谐磁转变温度 T m 在临界压力 P c 处出现转折点，并伴随着反常霍尔效应（AHE）的符号反转。利用 TYJ 缩放模型对内在和外在贡献的分离表明，在反常霍尔效应中，源于电子贝里曲率的内在机制在与外在机制的竞争中占据优先地位。上述发现可归因于压力调谐带拓扑和隔离层中磁相互作用的共同作用。我们的研究结果为设计和操纵磁拓扑材料中的本征 AHE 提供了一条实用途径。
{"title":"Pressure-tuned intrinsic anomalous Hall conductivity in kagome magnets RV6Sn6 (R = Gd, Tb)","authors":"Xiangming Kong, Zicheng Tao, Rui Zhang, Wei Xia, Xu Chen, Cuiying Pei, Tianping Ying, Yanpeng Qi, Yanfeng Guo, Xiaofan Yang, Shiyan Li","doi":"10.1088/0256-307x/41/4/047503","DOIUrl":"https://doi.org/10.1088/0256-307x/41/4/047503","url":null,"abstract":"\u0000 Exploration of exotic phenomena in magnetic topological systems is at the frontier of condensed matter physics, holding a significant promise for the applications in topological spintronics. However, complex magnetic structures carrying nontrivial topological properties hinder its progresses. Here, we investigate the pressure effect on the novel topological kagome magnets GdV6Sn6 and TbV6Sn6 to dig out the interplay between magnetic Gd/Tb layers and nonmagnetic V-based kagome sublattice. The pressure-tuned magnetic transition temperature T\u0000 m in both compounds exhibit a turning point at the critical pressure P\u0000 c, accompanying with a sign reversal in anomalous Hall effect (AHE). The separation of intrinsic and extrinsic contributions using the TYJ scaling model suggests that the intrinsic mechanism originating from the electronic Berry curvature holds the priority in the competition with extrinsic mechanism in AHE. Above findings can be attributed to the combined effect of pressure-tuned band topology and magnetic interaction in segregated layers. Our results provide a practical route to design and manipulate the intrinsic AHE in magnetic topological materials.","PeriodicalId":505209,"journal":{"name":"Chinese Physics Letters","volume":"100 44","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140377610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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