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Surface Phonons and Possible Structural Phase Transition in a Topological Semimetal PbTaSe2
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-25 DOI: 10.1002/andp.202400277
Vivek Kumar, Pradeep Kumar

Topological insulators are characterized by protected gapless surface or edge states but insulating bulk states which is due to the presence of spin-orbit interactions and time-reversal symmetry. Here, an in-depth investigation of a topological nodal line semimetal PbTaSe2 via temperature, polarization dependent Raman spectroscopy, and temperature dependent single crystal X-ray diffraction (SC-XRD) measurements is reported. The analysis shows signature of electron-phonon coupling as reflected in the Fano asymmetry in line shape of M1-M4 modes and anomalous temperature variation of line-width of P3-P4 modes. Further polarization dependent phonon symmetry changes at different temperature (6K and 300K), discontinuities in bulk phonon dynamics for P2-P5 modes, and disappearance of phonon modes, i.e., M1-M5, on decreasing temperature indicates toward a thermally induced structural phase transition which is also supported by the SC-XRD results. Hence based on the findings, it is proposed that M1-M4 modes are surface phonon modes, the material undergoes a thermally induced structural phase transition from α to β phase at Tα→β ≈ 150 K or is in close proximity to the β phase and another transition below TCDW+β ≈ 100K which is possibly due to the interplay of remanent completely commensurate charge density wave (CCDW) of 1H-TaSe2 and β phase.

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引用次数: 0
Masthead: Ann. Phys. 11/2024 刊头Ann.11/2024
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-11 DOI: 10.1002/andp.202470026
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引用次数: 0
(Ann. Phys. 11/2024) (Ann. Phys. 11/2024)
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-11 DOI: 10.1002/andp.202470025

Negative-Mass Black Holes under Antichronous Transformations

Black hole's gravitational singularities are solved by interior negative energies and masses through time transformations of relativistic quantum mechanics and antichronous transformations of the full Lorentz group, which, if taking place at event horizons, respect Einstein's equivalence principle. For further details, see article number 2400139 by Manuel Uruena Palomo.

反时空变换下的负质量黑洞通过相对论量子力学的时间变换和全洛伦兹群的反时空变换,解决了黑洞引力奇点的内部负能量和负质量问题。更多详情,请参阅曼努埃尔-乌鲁埃纳-帕洛莫(Manuel Uruena Palomo)撰写的第 2400139 号文章。
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引用次数: 0
(Ann. Phys. 11/2024) (Ann. Phys. 11/2024)
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-11 DOI: 10.1002/andp.202470024

Enhancement of Quantum Entanglement in Cavity–Magnon systems

In article number 2400221, Rong-Can Yang, Hong-Yu Liu, and co-workers focus on the enhancement of quantum entanglement and quantum steering in cavity–magnon hybrid systems using quantum coherent feedback (QCFB) control loops, as shown in the cover image. In the scheme, SQUID is applied to realize Josephson parametric amplification, driving the 3D microwave cavity with two-photon field. Moreover, quantum correlation of the two magnon modes is indirectly established through the magnetic dipole interaction, and the enhancement is implemented effectively with QCFB.

增强腔磁系统中的量子纠缠在第 2400221 号文章中,杨荣灿、刘洪宇及其合作者重点研究了利用量子相干反馈(QCFB)控制环增强腔磁混合系统中的量子纠缠和量子转向,如封面图片所示。在该方案中,SQUID 被用于实现约瑟夫森参量放大,用双光子场驱动三维微波腔。此外,还通过磁偶极子相互作用间接建立了两个磁子模式的量子相关性,并利用 QCFB 有效地实现了增强。
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引用次数: 0
Correction to “Unconventional Light-Matter Interactions Between Giant Atoms and Structured Baths with Next-Nearest-Neighbor Coplings” 修正“巨型原子和结构浴与次近邻耦合之间的非常规光物质相互作用”
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-10 DOI: 10.1002/andp.202400363

Pengfei Wang, Lei Huang, Hanxiao Zhang, Hong Yang, and Dong Yan. Unconventional Light-Matter Interactions Between Giant Atoms and Structured Baths with Next-Nearest-Neighbor Coplings. Annalen der Physik (Berlin), 2024, 536, 2400165.

https://doi.org/10.1002/andp.202400165

The first affiliation of all authors is incorrect. It should read: “College of Physics and Electronic Engineering, Hainan Normal University, Haikou 571158, P. R. China.”

We apologize for this error.

王鹏飞、黄磊、张涵晓、杨红和严东。巨原子与近邻原子结构浴之间的非常规光物质相互作用》。Annalen der Physik (Berlin), 2024, 536, 2400165.https://doi.org/10.1002/andp.202400165The 所有作者的第一作者单位有误。应为"海南师范大学物理与电子工程学院,海口 571158,中华人民共和国。"我们对此错误深表歉意。
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引用次数: 0
Controllable Quantum Entanglement and One-Way Steering in a Dual-Cavity-Magnon System
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-07 DOI: 10.1002/andp.202400251
Chun-Yu Zuo, Rui-Hao Qian, Wen-Bin Wu, Yu Tao, Ye-Jun Xu

The quantum entanglement and the one-way quantum steering in cavity magnonic system composed of a yttrium iron garnet (YIG) sphere and two microwave cavities, one of which is driven by a two-photon drive field, are studied. Bipartite entanglement, tripartite entanglement, and steering can be achieved under the four-wave mixing process. It is shown that the degree of entanglement and the direction of one-way steering can be manipulated not only by designing the dissipation ratio between the two cavity modes but also by regulating the coherent coupling strength ratio between the two cavity modes and the magnon mode. It is found that the direction of steering is associated with the populations of the two cavity modes, meaning that the mode with a greater population always dominates the steering direction. Especially, the transfer between cavity–magnon entanglement and cavity–cavity entanglement can be realized by adjusting the coupling strengths. The findings provide a practical method for coherently manipulating entanglement and one-way steering in cavity–magnon system.

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引用次数: 0
Quantum Machines Using Cu 3 $mathrm{Cu}_{3}$ -Like Compounds Modeled by Heisenberg Antiferromagnetic in a Triangular Ring 使用 Cu 3 $mathrm{Cu}_{3}$ 类化合物的量子机器,以三角形环中的海森堡反铁磁性为模型
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-06 DOI: 10.1002/andp.202400291
Onofre Rojas, Moises Rojas
<p>A theoretical study of an antiferromagnetically coupled spin system, specifically <span></span><math> <semantics> <mrow> <msub> <mtext>Cu</mtext> <mn>3</mn> </msub> <mo>−</mo> <mi>X</mi> <mrow> <mo>(</mo> <mtext>X=As, Sb</mtext> <mo>)</mo> </mrow> </mrow> <annotation>$text{Cu}_{3}-text{X}(text{X=As, Sb})$</annotation> </semantics></math>, characterized by a slightly distorted equilateral triangle configuration is presented. Using the Heisenberg model with exchange and Dzyaloshinskii–Moriya interactions, g-factors, and an external magnetic field, three quantum machines are investigated using this system as the working substance, assuming reversible processes. For <span></span><math> <semantics> <mrow> <msub> <mtext>Cu</mtext> <mn>3</mn> </msub> <mo>−</mo> <mi>X</mi> </mrow> <annotation>$text{Cu}_{3}-text{X}$</annotation> </semantics></math> the magnetocaloric effect (MCE) is significant at low temperatures (<span></span><math> <semantics> <mo>≈</mo> <annotation>$approx$</annotation> </semantics></math>1K) under a perpendicular magnetic field (<span></span><math> <semantics> <mrow> <mo>≈</mo> <mn>5</mn> <mi>T</mi> </mrow> <annotation>$approx 5{rm T}$</annotation> </semantics></math>). Although only the <span></span><math> <semantics> <mrow> <msub> <mtext>Cu</mtext> <mn>3</mn> </msub> <mo>−</mo> <mtext>As</mtext> </mrow> <annotation>$text{Cu}_{3}-text{As}$</annotation> </semantics></math> compound is considered, since the <span></span><math> <semantics> <mrow> <msub> <mtext>Cu</mtext> <mn>3</mn> </msub> <mo>−</mo> <mtext>Sb</mtext> </mrow> <annotation>$text{Cu}_{3}-text{Sb}$</annotation> </semantics></math> compound behaves quite similarly. How MCE influences the Carnot machine, which operates as a heat engine or refrigerator when varying the external magnetic field is analyzed. In contrast, the Otto and Stirling machines can operate as heat engines, refrigerators, heaters, or thermal accelerators, depending on the magnetic field intensity. The results indic
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引用次数: 0
Hong-Ou-Mandel Interference on a Lattice: Symmetries and Interactions
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-06 DOI: 10.1002/andp.202400132
Mama Kabir Njoya Mforifoum, Andreas Buchleitner, Gabriel Dufour

The Hong-Ou-Mandel interference of two identical particles evolving on a 1D tight-binding lattice where a potential barrier plays the role of a beam splitter is described. Careful consideration of the symmetries underlying the two-particle interference effect allows to reformulate the problem in terms of ordinary wave interference in a Michelson interferometer. This approach is easily generalized to the case where the particles interact, and we compare the resulting analytical predictions for the bunching probability to numerical simulations of the two-particle dynamics.

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引用次数: 0
Studies of Parity Violation in Atoms
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-11-06 DOI: 10.1002/andp.202400261
Stefanos Nanos, Iraklis Papigkiotis, Dionysios Antypas

Studies of the effects of the weak interaction in atomic systems provide tests of the Standard Model of particle physics, and explore physics scenarios beyond the Standard Model. In addition, these studies can offer valuable insights into low-energy nuclear physics. An overview of the field of atomic parity violation is provided, and implications to nuclear and particle physics and ongoing experimental efforts are discussed. Furthermore, the plans for precision measurements of the signatures of the weak interaction in atomic ytterbium are discussed.

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引用次数: 0
Semi-Quantum Signature Protocol Using EPR Steering and Single Photons
IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Pub Date : 2024-10-29 DOI: 10.1002/andp.202400260
Chun-Wei Yang

This study tackles critical issues in semi-quantum signature (SQS) protocols to enhance security and efficiency. It revisits Xia et al.’s SQS protocol, which uses EPR steering for security but introduces inconsistencies in a semi-quantum environment. Xia et al. assume that both the signatory and arbitrator have full quantum capabilities, while the verifier only has partial capabilities, making them a classical participant. However, their protocol requires the verifier to perform eavesdropping checks, necessitating quantum storage, which is not aligned with a semi-quantum environment. The study proposes a novel SQS protocol using EPR steering and single photons, with pre-shared keys to determine photon arrangements to address this. This ensures that only the communicating parties know the inspection and message transmission locations, solving the quantum storage issue and enabling efficient eavesdropper detection and identity authentication. This new protocol adheres to semi-quantum principles and sets a foundation for future advancements in quantum cryptography and secure communication.

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引用次数: 0
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Annalen der Physik
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