Article
Optics
Ying Lei, Shaoliang Zhang
Summary: This study investigates the cavity-assisted dynamical spin-orbit coupling and its effects on quantum phase transitions, revealing the generation of various interesting quantum phenomena. Additionally, the influence of atom decay and nonlinear coupling on the phase diagram is discussed, highlighting the suppression of discontinuities and the breaking of symmetries in the phase transition.
Article
Multidisciplinary Sciences
Yuki Hibino, Tomohiro Taniguchi, Kay Yakushiji, Akio Fukushima, Hitoshi Kubota, Shinji Yuasa
Summary: The study elucidates a mechanism behind the enhancement of magnetic-dependent charge-to-spin conversion in ferromagnetic materials, highlighting the dominant role of interfacial contribution and the potential for control via interfacial band engineering. It shows that the efficiency of charge-to-spin conversion in ferromagnets surpasses other materials with reduced symmetry.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Mona Abdi, Bandar Astinchap
Summary: In this study, we investigated the dynamical spin susceptibility of the GeCH3 monolayer in the presence of an external magnetic field by introducing the Kane-Mele model. Our findings demonstrated that the transverse excitation modes exhibited frequency shifts under tensile or compressive biaxial strain. Moreover, the frequency position of the sharp peak in the transverse dynamical spin susceptibility remained unaffected by changes in the external magnetic field, electron doping, or spin-orbit coupling.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Physics, Multidisciplinary
Jieli Qin, Lu Zhou, Guangjiong Dong
Summary: Spin-orbital coupling and parity-time symmetry are of great importance in various fields such as condensed matter physics, cold atom physics, optics, and acoustics, and have potential applications in spintronics, quantum computation, sensors, and other functionalities. In this study, it is shown that a new type of SOC, called imaginary SOC, can be synthesized in a PT-symmetric pseudo spin-1/2 system. This SOC can substantially change the energy spectrum, generating a double-valleys structure and tunable complex energy bands. Potential experimental realizations are proposed in cold atomic gases and systems of coupled waveguides.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
A. Valdes-Curiel, D. Trypogeorgos, Q. -Y. Liang, R. P. Anderson, I. B. Spielman
Summary: In this study, researchers explore the topology in spin-orbit coupled 87Rb atoms using time domain spectroscopy and quantum state tomography. They measure the full quantum state to extract the Berry phase of the system and demonstrate signatures of a half-integer Chern index.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Peng Shi, Luping Du, Aiping Yang, Xiaojin Yin, Xinrui Lei, Xiaocong Yuan
Summary: In this study, a field theory was developed to reveal the physical origin and topological properties of longitudinal and transverse spins for arbitrary electromagnetic waves. The experimental results showed that the number of spin-momentum locking states coincides with the spin Chern number, providing valuable insight for constructing spin-based field theory and exploiting optical topological quasiparticle-based applications.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Multidisciplinary
Meng Ye, Ye Tian, Jian Lin, Yuchen Luo, Jiaqi You, Jiazhong Hu, Wenjun Zhang, Wenlan Chen, Xiaopeng Li
Summary: This study demonstrates the universality of the atom cavity system for quantum optimization with arbitrary connectivity, achieving programmability by placing atoms at different positions in the cavity. The system can efficiently encode and solve number partition problems and quadratic unconstrained binary optimization problems. These results suggest that the atom cavity system is a promising quantum optimization platform.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Stefan Ostermann, Helmut Ritsch, Farokh Mivehvar
Summary: In this study, we investigate the many-body phases of a two-dimensional Bose-Einstein condensate with cavity-mediated dynamic spin-orbit coupling. We identify three quantum phases with distinct atomic and photonic properties: the normal homogeneous phase, the superradiant spin-helix phase, and the superradiant supersolid spin-density-wave phase. The last phase exhibits an emergent crystal with a specific lattice structure in the atomic density distribution.
Article
Physics, Multidisciplinary
Robert J. Lewis-Swan, Diego Barberena, Julia R. K. Cline, Dylan J. Young, James K. Thompson, Ana Maria Rey
Summary: The proposal suggests simulating dynamical phases of a BCS superconductor using cold atoms trapped in an optical cavity, with effective Cooper pairs encoded via internal states of the atoms and attractive interactions realized through the exchange of virtual photons. By controlling the interaction strength and dispersion relation of the effective Cooper pairs, exploration of the full dynamical phase diagram of the BCS model is enabled. This proposal opens the door for studying the nonequilibrium features of quantum magnetism and superconductivity through atom-light interactions in cold atomic gases.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Sourabh Manna, Rohit Medwal, Surbhi Gupta, John Rex Mohan, Yasuhiro Fukuma, Rajdeep Singh Rawat
Summary: Ferromagnet/nonmagnet (FM/NM) bilayer-based spin Hall nano-oscillators (SHNOs) have potential for low-power physical reservoir computing systems. However, most studies require an external biasing magnetic field, limiting their practical implementation. This study demonstrates biasing field-free operation of a FM/NM bilayer-based SHNO using magnetic anisotropy control, which can significantly modify the auto-oscillation characteristics and reduce the threshold current for auto-oscillation.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Peng Zhang, Pengju Tang, Ruizhi Pan, Xuzong Chen, Xiaoji Zhou, Shougang Zhang
Summary: We investigated the optomechanical dynamics and explored the quantum phase of a Bose-Einstein condensate in a ring cavity. The interaction between the atoms and the cavity field in the running wave mode induces a semiquantized spin-orbit coupling (SOC) for the atoms. Our scheme is immediately realizable and the results are measurable in experiments.
Article
Materials Science, Multidisciplinary
L. L. Tao, Qin Zhang, Huinan Li, Xianjie Wang, Yi Wang, Yu Sui, Bo Song, M. Ye. Zhuravlev
Summary: Quasisymmetry is an approximate symmetry that emerges in low-energy effective theory and commutes with the Hamiltonian at a lower order. It adds desirable properties to the system, such as large Berry curvatures due to small band gaps, which are robust against perturbations.
Article
Optics
Peng Shi, Luping Du, Mingjie Li, Xiaocong Yuan
Summary: This research proposes a theoretical framework to show that photonic chiral spin textures in optical interfaces originate from the system's symmetry and relativity. The analysis of rotational symmetry in optical systems reveals the crucial role of the local spin momentum distribution in the chiral twisting of local spin vectors.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Y. Chargui, A. Dhahbi, M. A. J. Ali
Summary: This paper considers a generalized version of the Duffin-Kemmer-Petiau oscillator (DKPO) model for spin-1 bosons by introducing an additional spin-orbit coupling (SOC). The model satisfies the requirements of Lorentz covariance and a conserved four-current, and provides exact solutions for both natural and unnatural parity states and any total angular momentum number. The obtained energy eigenvalues demonstrate that the additional SOC brings radical modifications to the spectroscopy of the DKPO, particularly making the spin-orbit splitting of energy levels independent from oscillator shells. Furthermore, interesting special cases of the model and its non-relativistic limit are discussed.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
D. C. Cavanagh, Daniel F. Agterberg, P. M. R. Brydon
Summary: We investigate the effect of symmetry-breaking perturbations on superconductivity in multiorbital materials, focusing on the influence of an external magnetic field. We introduce the field-fitness function to characterize the disruption of pair formation due to the perturbation. In even-parity superconductors, the field-fitness function for an external magnetic field is unity, indicating that the paramagnetic response is determined solely by a generalized effective g-factor. For odd-parity superconductors, the interplay between the effective g-factor and the field-fitness function can result in counterintuitive outcomes. We demonstrate this phenomenon in the p-wave pairing of the effective j=32 electronic states in the Luttinger-Kohn model.
Editorial Material
Physics, Multidisciplinary
Yanglin Hu, Zhelun Zhang, Biao Wu
Summary: The study introduces a quantum adiabatic algorithm for solving Q2SAT problems by constructing a Hamiltonian similar to a Heisenberg chain, evolving the system to stay in the degenerate subspace, and obtaining non-trivial solutions. Numerical results suggest a time complexity of O(n^(3.9)), and advantages over known quantum and classical algorithms are discussed.
Article
Physics, Multidisciplinary
Yu-Yu Zhang, Zi-Xiang Hu, Libin Fu, Hong-Gang Luo, Han Pu, Xue-Feng Zhang
Summary: Studying the quantum Rabi triangle system revealed the emergence of a chiral phase and associated phase transitions, with potential implications for the study of artificial magnetic fields and light-matter coupling systems. This model may offer new insights and applications in the development of various quantum technologies.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Shah Saad Alam, Timothy Skaras, Li Yang, Han Pu
Summary: Dynamical fermionization phenomenon in Tonks-Girardeau gases shows that the momentum density profile approaches that of an ideal Fermi gas after being released from harmonic confinement. By extending the study to a one-dimensional spinor gas of arbitrary spin in a strongly interacting regime, it is analytically proven that the total momentum distribution resembles that of a spinless ideal Fermi gas and each spin component maintains the shape of the initial real space density profile.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Ceramics
Lin Dong, Mei-Jun Liu, Xiao-Feng Zhang, Xue-Shi Zhuo, Jia-Feng Fan, Guan-Jun Yang, Ke-Song Zhou
Summary: The research proposed a method of pressure infiltration densification to block the open pores in the coatings, preventing the transport of oxidants and corrosives, ultimately improving the performance stability of EBCs in harsh engine environments.
JOURNAL OF ADVANCED CERAMICS
(2022)
Article
Materials Science, Ceramics
Lin Dong, Mei-Jun Liu, Xiao-Feng Zhang, Guan-Jun Yang, Ke-Song Zhou
Summary: By infiltrating aluminum, a dense environmental barrier coating was designed to prevent rapid permeation of oxidants and improve corrosion resistance.
CERAMICS INTERNATIONAL
(2022)
Article
Multidisciplinary Sciences
Ruwan Senaratne, Danyel Cavazos-Cavazos, Sheng Wang, Feng He, Ya-Ting Chang, Aashish Kafle, Han Pu, Xi-Wen Guan, Randall G. Hulet
Summary: Confining ultracold atoms to periodic potentials is a powerful method for simulating complex many-body systems. In this study, we confined fermions to one dimension to realize the Tomonaga-Luttinger liquid model and observed a velocity shift of spin and charge excitations in opposite directions, indicating the existence of spin-charge separation.
Article
Physics, Multidisciplinary
Diego Fallas Padilla, Han Pu, Guo-Jing Cheng, Yu-Yu Zhang
Summary: The quantum Rabi ring is mapped into an effective magnetic model containing XY exchange and DM interactions, with the latter induced by an artificial magnetic field. The different phases in the quantum optical model are described through simple arguments of competing magnetic interactions. The rich phase diagram shows three superradiant phases, with DM interaction playing a key role in the chiral phase. Geometric frustration contributes to stabilizing the chiral phase even for small values of the DM interaction, and odd and even N show different scaling behavior close to the phase transition.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Li Yang, Shah Saad Alam, Han Pu
Summary: This article reviews some work on strongly interacting 1D spinor quantum gas, discussing a generalized Bose-Fermi mapping and constructing an ansatz wavefunction for the strongly interacting system.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2022)
Article
Multidisciplinary Sciences
Xu-Fei Yin, Xing-Can Yao, Biao Wu, Yue-Yang Fei, Yingqiu Mao, Rui Zhang, Li-Zheng Liu, Zhenduo Wang, Li Li, Nai-Le Liu, Frank Wilczek, Yu-Ao Chen, Jian-Wei Pan
Summary: This study employs non-Abelian adiabatic mixing to tackle the independent set problem and successfully identifies the maximum independent set by simulating a linear optical quantum network. The experiment showcases the high probability of finding nontrivial independent sets, thereby demonstrating the potential advantage of non-Abelian adiabatic mixing for solving equivalent problems.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Jia-Jia Luo, Han Pu, Xi -Wen Guan
Summary: In this study, a rigorous understanding of the one-dimensional repulsive Fermi-Hubbard model is provided based on the solutions to the thermodynamic Bethe ansatz equations. The fractional excitations, universal properties, and asymptotic of correlation functions in various phases are calculated and analyzed. The interaction-driven phase transition and its relationship with the contact susceptibilities and variations of density, magnetization, and entropy are also investigated. Furthermore, a quantum cooling scheme based on the interaction-driven refrigeration cycle is proposed as an application of these concepts, which are applicable to higher-dimensional systems.
Article
Materials Science, Multidisciplinary
Chunping Gao, Zheng Tang, Fei Zhu, Yunbo Zhang, Han Pu, Li Chen
Summary: This paper investigates the impact of local gauge symmetry on quantum thermalization breaking and finds that disorder-free quantum many-body localization and entropy prethermalization can occur in a system with a specific interaction by introducing four-fermion interaction. The interplay between fermion interaction and U(1) gauge symmetry endows gauge fields with disordered potential, leading to anomalous behaviors in the long-time evolution of various quantities. This work provides a different platform to explore emergent nonthermal dynamics in state-of-the-art quantum simulators with gauge symmetries.
Article
Physics, Multidisciplinary
Chunping Gao, Jinghu Liu, Maolin Chang, Han Pu, Li Chen
Summary: Recent experimental progress has allowed for the simulation of elementary particles and their interactions using ultracold atoms. In this paper, the authors propose a platform for simulating the deconfined lattice Schwinger model using a spin-1 Bose-Einstein condensate. Unlike previous platforms, the atomic interactions in this spin-1 condensate naturally lead to a matter-field interaction term that respects U(1) gauge symmetry. This platform provides a way to extract emergent physics in synthetic gauge systems with matter-field interactions.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Optics
Jia-Jin Feng, Biao Wu, Frank Wilczek
Summary: The research proposes the possibility of computing by coupling computational spins to a quantum coherent bath, utilizing the additional cooling channels provided by the quantum tunneling effect to accelerate the cooling process, and demonstrates a quantum advantage in the unstructured search problem.
Article
Optics
Youjiang Xu, Diego Fallas Padilla, Han Pu
Summary: This study explores a significant generalization of the Dicke model, where a set of multilevel atoms interact with a photon mode, leading to the possibility of achieving multicritical conditions and designing experiments to achieve quantum phase transitions of desired order. The research also reveals that the order of criticality strongly influences the critical entanglement entropy, with higher order resulting in stronger entanglement. This work provides valuable insights into quantum phase transitions and multicriticality.
Article
Optics
Sagarika Basak, Han Pu
Summary: The study examines a two-component coupled Bose gas in a 1D optical lattice. The coupling of components leads to changes in spin phases and reveals remarkable spin correlations. The phase transition shifts from first to second order with the introduction of coupling, resulting in the emergence of two spin phases instead of one.
