Frontiers of Physics最新文献_第10页

Parity-dependent skin effects and topological properties in the multilayer nonreciprocal Su–Schrieffer–Heeger structures 多层非互惠苏-施里弗-黑格尔结构中依赖奇偶性的集肤效应和拓扑特性

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-11 DOI: 10.1007/s11467-023-1350-y

Jia-Rui Li, Cui Jiang, Han Su, Di Qi, Lian-Lian Zhang, Wei-Jiang Gong

{"title":"Parity-dependent skin effects and topological properties in the multilayer nonreciprocal Su–Schrieffer–Heeger structures","authors":"Jia-Rui Li, Cui Jiang, Han Su, Di Qi, Lian-Lian Zhang, Wei-Jiang Gong","doi":"10.1007/s11467-023-1350-y","DOIUrl":"10.1007/s11467-023-1350-y","url":null,"abstract":"<div><p>We concentrate on the skin effects and topological properties in the multilayer non-Hermitian Su–Schrieffer–Heeger (SSH) structure, by taking into account the nonreciprocal couplings between the different sublattices in the unit cells. Following the detailed demonstration of the theoretical method, we find that in this system, the skin effects and topological phase transitions induced by nonreciprocal couplings display the apparent parity effect, following the increase of the layer number of this SSH structure. On the one hand, the skin effect is determined by the parity of the layer number of this SSH system, as well as the parity of the band index of the bulk states. On the other hand, for the topological edge modes, such an interesting parity effect can also be observed clearly. Next, when the parameter disorders are taken into account, the zero-energy edge modes in the odd-layer structures tend to be more robust, whereas the other edge modes are easy to be destroyed. In view of these results, it can be ascertained that the findings in this work promote to understand the influences of nonreciprocal couplings on the skin effects and topological properties in the multilayer SSH lattices.\u0000</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 3","pages":""},"PeriodicalIF":7.5,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138565707","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}

引用次数: 0

Detecting bulk and edge exceptional points in non-Hermitian systems through generalized Petermann factors 通过广义彼得曼因子检测非赫米提系统中的体例外点和边缘例外点

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-07 DOI: 10.1007/s11467-023-1337-8

Yue-Yu Zou, Yao Zhou, Li-Mei Chen, Peng Ye

{"title":"Detecting bulk and edge exceptional points in non-Hermitian systems through generalized Petermann factors","authors":"Yue-Yu Zou, Yao Zhou, Li-Mei Chen, Peng Ye","doi":"10.1007/s11467-023-1337-8","DOIUrl":"10.1007/s11467-023-1337-8","url":null,"abstract":"<div><p>Non-orthogonality in non-Hermitian quantum systems gives rise to tremendous exotic quantum phenomena, which can be fundamentally traced back to non-unitarity. In this paper, we introduce an interesting quantity (denoted as <i>η</i>) as a new variant of the Petermann factor to directly and efficiently measure non-unitarity and the associated non-Hermitian physics. By tuning the model parameters of underlying non-Hermitian systems, we find that the discontinuity of both <i>η</i> and its first-order derivative (denoted as <i>∂η</i>) pronouncedly captures rich physics that is fundamentally caused by non-unitarity. More concretely, in the 1D non-Hermitian topological systems, two mutually orthogonal edge states that are respectively localized on two boundaries become non-orthogonal in the vicinity of discontinuity of <i>η</i> as a function of the model parameter, which is dubbed “edge state transition”. Through theoretical analysis, we identify that the appearance of edge state transition indicates the existence of exceptional points (EPs) in topological edge states. Regarding the discontinuity of <i>∂η</i>, we investigate a two-level non-Hermitian model and establish a connection between the points of discontinuity of <i>∂η</i> and EPs of bulk states. By studying this connection in more general lattice models, we find that some models have discontinuity of <i>∂η</i>, implying the existence of EPs in bulk states.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 2","pages":""},"PeriodicalIF":7.5,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138548083","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}

引用次数: 1

A semiclassical perspective on nuclear chirality 核手性的半经典视角

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-07 DOI: 10.1007/s11467-023-1339-6

Radu Budaca

引用次数: 0

Fast nuclear-spin gates and electrons-nuclei entanglement of neutral atoms in weak magnetic fields 弱磁场中性原子的快速核-自旋门和电子-核纠缠

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-07 DOI: 10.1007/s11467-023-1332-0

Xiao-Feng Shi

{"title":"Fast nuclear-spin gates and electrons-nuclei entanglement of neutral atoms in weak magnetic fields","authors":"Xiao-Feng Shi","doi":"10.1007/s11467-023-1332-0","DOIUrl":"10.1007/s11467-023-1332-0","url":null,"abstract":"<div><p>We present a novel class of Rydberg-mediated nuclear-spin entanglement in divalent atoms with global laser pulses. First, we show a fast nuclear-spin controlled phase gate of an arbitrary phase realizable either with two laser pulses when assisted by Stark shifts, or with three pulses. Second, we propose to create an electrons–nuclei-entangled state, which is named a super bell state (SBS) for it mimics a <i>large</i> Bell state incorporating three <i>small</i> Bell states. Third, we show a protocol to create a three-atom electrons-nuclei entangled state which contains the three-body <i>W</i> and Green-berger–Horne–Zeilinger (GHZ) states simultaneously. These protocols possess high intrinsic fidelities, do not require single-site Rydberg addressing, and can be executed with large Rydberg Rabi frequencies in a weak, Gauss-scale magnetic field. The latter two protocols can enable measurement-based preparation of Bell, hyperentangled, and GHZ states, and, specifically, SBS can enable quantum dense coding where one can share three classical bits of information by sending one particle.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 2","pages":""},"PeriodicalIF":7.5,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138547942","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}

引用次数: 0

Local quantum Fisher information and quantum correlation in the mixed-spin Heisenberg XXZ chain 混合自旋海森堡 XXZ 链中的局部量子费雪信息和量子相关性

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-07 DOI: 10.1007/s11467-023-1336-9

Peng-Fei Wei, Qi Luo, Huang-Qiu-Chen Wang, Shao-Jie Xiong, Bo Liu, Zhe Sun

{"title":"Local quantum Fisher information and quantum correlation in the mixed-spin Heisenberg XXZ chain","authors":"Peng-Fei Wei, Qi Luo, Huang-Qiu-Chen Wang, Shao-Jie Xiong, Bo Liu, Zhe Sun","doi":"10.1007/s11467-023-1336-9","DOIUrl":"10.1007/s11467-023-1336-9","url":null,"abstract":"<div><p>We study the local quantum Fisher information (LQFI) in the mixed-spin Heisenberg <i>XXZ</i> chain. Both the maximal and minimal LQFI are studied and the former is essential to determine the accuracy of the quantum parameter estimation, the latter can be well used to characterize the discord-type quantum correlations. We investigate the effects of the temperature and the anisotropy parameter on the maximal LQFI and thus on the accuracy of the parameter estimation. Then we make use of the minimal LQFI to study the discord-type correlations of different site pairs. Different dimensions of the subsystems cause different values of the minimal LQFI which reflects the asymmetry of the discord-type correlation. In addition, the site pairs at different positions of the spin chains have different minimal LQFI, which reveals the influence of the surrounding spins on the bipartite quantum correlation. Our results show that the LQFI obtained through a simple calculation process provides a convenient way to investigate the discord-type correlation in high-dimensional systems.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 2","pages":""},"PeriodicalIF":7.5,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138548085","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}

引用次数: 0

Two-dimensional anisotropic vortex quantum droplets in dipolar Bose-Einstein condensates 二极玻色-爱因斯坦凝聚态中的二维各向异性涡旋量子液滴

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-07 DOI: 10.1007/s11467-023-1338-7

Guilong Li, Xunda Jiang, Bin Liu, Zhaopin Chen, Boris A. Malomed, Yongyao Li

{"title":"Two-dimensional anisotropic vortex quantum droplets in dipolar Bose-Einstein condensates","authors":"Guilong Li, Xunda Jiang, Bin Liu, Zhaopin Chen, Boris A. Malomed, Yongyao Li","doi":"10.1007/s11467-023-1338-7","DOIUrl":"10.1007/s11467-023-1338-7","url":null,"abstract":"<div><p>Creation of stable intrinsically anisotropic self-bound states with embedded vorticity is a challenging issue. Previously, no such states in Bose–Einstein condensates (BECs) or other physical settings were known. Dipolar BEC suggests a unique possibility to predict stable two dimensional anisotropic vortex quantum droplets (2D-AVQDs). We demonstrate that they can be created with the vortex axis oriented <i>perpendicular</i> to the polarization of dipoles. The stability area and characteristics of the 2D-AVQDs in the parameter space are revealed by means of analytical and numerical methods. Further, the rotation of the polarizing magnetic field is considered, and the largest angular velocities, up to which spinning 2D-AVQDs can follow the rotation in clockwise and anti-clockwise directions, are found. Collisions between moving 2D-AVQDs are studied too, demonstrating formation of bound states with a vortex-antivortex-vortex structure. A stability domain for such stationary bound states is identified. Unstable dipolar states, that can be readily implemented by means of phase imprinting, quickly transform into robust 2D-AVQDs, which suggests a straightforward possibility for the creation of these states in the experiment.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 2","pages":""},"PeriodicalIF":7.5,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136212294","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}

引用次数: 4

Nanophononic metamaterials induced proximity effect in heat flux regulation 纳米声子超材料在热流调节中的邻近效应

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-06 DOI: 10.1007/s11467-023-1349-4

Jian Zhang, Haochun Zhang, Gang Zhang

{"title":"Nanophononic metamaterials induced proximity effect in heat flux regulation","authors":"Jian Zhang, Haochun Zhang, Gang Zhang","doi":"10.1007/s11467-023-1349-4","DOIUrl":"10.1007/s11467-023-1349-4","url":null,"abstract":"<div><p>Recent studies have shown that the construction of nanophononic metamaterials can reduce thermal conductivity without affecting electrical properties, making them promising in many fields of application, such as energy conversion and thermal management. However, although extensive studies have been carried out on thermal conductivity reduction in nanophononic metamaterials, the local heat flux characteristic is still unclear. In this work, we construct a heat flux regulator which includes a silicon nanofilm with silicon pillars. The regulator has remarkable heat flux regulation ability, and various impacts on the regulation ability are explored. Surprisingly, even in the region without nanopillars, the local heat current is still lower than that in pristine silicon nanofilms, reduced by the neighboring nanopillars through the thermal proximity effect. We combine the analysis of the phonon participation ratio with the intensity of localized phonon modes to provide a clear explanation. Our findings not only provide insights into the mechanisms of heat flux regulation by nanophononic metamaterials, but also will open up new research directions to control local heat flux for a broad range of applications, including heat management, thermoelectric energy conversion, thermal cloak, and thermal concentrator.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 2","pages":""},"PeriodicalIF":7.5,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138493874","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}

引用次数: 0

Engineering phonon thermal transport in few-layer PdSe2 少层PdSe2中的工程声子热输运

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-06 DOI: 10.1007/s11467-023-1351-x

Meilin Li, Huanhuan Sun, Jun Zhou, Yunshan Zhao

{"title":"Engineering phonon thermal transport in few-layer PdSe2","authors":"Meilin Li, Huanhuan Sun, Jun Zhou, Yunshan Zhao","doi":"10.1007/s11467-023-1351-x","DOIUrl":"10.1007/s11467-023-1351-x","url":null,"abstract":"<div><p>Engineering phonon transport in low-dimensional materials has great significance not only for fundamental research, but also for thermal management applications of electric devices. However, due to the difficulties of micro and nano processing and characterization techniques, the work on tuning phonon transport at nanoscale are scarce. In this work, by introducing Ar<sup>+</sup> plasma, we probed the phonon transport in two-dimensional (2D) layered semiconductor PdSe<sub>2</sub> under different defect concentrations. By using thermal bridge method, the thermal conductivity was measured to decrease by 50% after a certain Ar<sup>+</sup> irradiation, which implied a possible phase transition. Moreover, Raman characterizations were performed to show that the Raman sensitive peaks of PdSe<sub>2</sub> was red-shifted and finally became disappeared with the increase of defect concentration. “Defect engineering” proves be a practical strategy in tuning the phonon thermal transport in low-dimensional materials, thus providing guidance for potential application in designing thermoelectric devices with various emerging materials.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":573,"journal":{"name":"Frontiers of Physics","volume":"19 3","pages":""},"PeriodicalIF":7.5,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138493876","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}

引用次数: 0

Simple collective model for nuclear chiral mode 核手性模式的简单集体模型

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-06 DOI: 10.1007/s11467-023-1356-5

R. V. Jolos, E. A. Kolganova, D. R. Khamitova

引用次数: 0

Optical two-dimensional coherent spectroscopy of excitons in transition-metal dichalcogenides 过渡金属二硫化物中激子的二维相干光谱学

IF 7.5 2区物理与天体物理

Frontiers of Physics Pub Date : 2023-12-02 DOI: 10.1007/s11467-023-1345-8

YanZuo Chen, ShaoGang Yu, Tao Jiang, XiaoJun Liu, XinBin Cheng, Di Huang

引用次数: 0