New Journal of Physics最新文献_第10页

Critical non-Hermitian topology induced quantum sensing 临界非赫密拓扑诱导量子传感

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-03 DOI: 10.1088/1367-2630/ad5c95

S Sarkar, F Ciccarello, A Carollo and A Bayat

引用次数: 0

Higher-order topological Dirac phase in Y3InC: a first-principles study Y3InC 中的高阶拓扑狄拉克相：第一原理研究

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-02 DOI: 10.1088/1367-2630/ad59ff

P C Sreeparvathy, Rovi Angelo B Villaos, Zhi-Quan Huang and Feng-Chuan Chuang

{"title":"Higher-order topological Dirac phase in Y3InC: a first-principles study","authors":"P C Sreeparvathy, Rovi Angelo B Villaos, Zhi-Quan Huang and Feng-Chuan Chuang","doi":"10.1088/1367-2630/ad59ff","DOIUrl":"https://doi.org/10.1088/1367-2630/ad59ff","url":null,"abstract":"Higher-order topological insulators hosting intriguing topologically protected hinge or corner states are of significant research interest. However, materials that possess higher-order topological hinge states associated with gapless bulk Dirac phases still need to be explored. Using first-principles calculations with hybrid exchange functional, we explore the electronic structure and topological properties of Y3InC and a few of its sister compounds, totaling 16 bulk materials. A symmetry-protected triple point phase, with dominated d-t2g character, is observed in Y3InC without spin–orbit coupling (SOC). Interestingly, the SOC induces a twin Dirac node phase in the bulk Y3InC. Furthermore, the computed Z4 topological invariant reveals the higher-order topological nature of investigated materials. To demonstrate the gapless hinge states, we conduct edge state calculations using a rod-shaped geometry of Y3InC. Remarkably, Y3InC is identified to host multi-Dirac nodes in the bulk and surface phases together with the higher-order hinge states. These results lay the groundwork for further experimental and theoretical investigations into cubic antiperovskite materials for higher-order topological phases.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141518416","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

Nonreciprocal collective dynamics in a mixture of phoretic Janus colloids 相思胶体混合物中的非互惠集体动力学

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-02 DOI: 10.1088/1367-2630/ad50ff

Gennaro Tucci, Ramin Golestanian and Suropriya Saha

{"title":"Nonreciprocal collective dynamics in a mixture of phoretic Janus colloids","authors":"Gennaro Tucci, Ramin Golestanian and Suropriya Saha","doi":"10.1088/1367-2630/ad50ff","DOIUrl":"https://doi.org/10.1088/1367-2630/ad50ff","url":null,"abstract":"A multicomponent mixture of Janus colloids with distinct catalytic coats and phoretic mobilities is a promising theoretical system to explore the collective behavior arising from nonreciprocal interactions. An active colloid produces (or consumes) chemicals, self-propels, drifts along chemical gradients, and rotates its intrinsic polarity to align with a gradient. As a result the connection from microscopics to continuum theories through coarse-graining couples densities and polarization fields in unique ways. Focusing on a binary mixture, we show that these couplings render the unpatterned reference state unstable to small perturbations through a variety of instabilities including oscillatory ones which arise on crossing an exceptional point or through a Hopf bifurcation. For fast relaxation of the polar fields, they can be eliminated in favor of the density fields to obtain a microscopic realization of the Nonreciprocal Cahn–Hilliard model for two conserved species with two distinct sources of non-reciprocity, one in the interaction coefficient and the other in the interfacial tension. Our work establishes Janus colloids as a versatile model for a bottom-up approach to both scalar and polar active mixtures.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141518415","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

Optimizing information-driven awareness allocation for controlling activity-triggered epidemic spread 优化信息驱动的认知分配，控制由活动引发的流行病传播

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-02 DOI: 10.1088/1367-2630/ad5b7f

Jie Chen, Maobin Hu and Jinde Cao

{"title":"Optimizing information-driven awareness allocation for controlling activity-triggered epidemic spread","authors":"Jie Chen, Maobin Hu and Jinde Cao","doi":"10.1088/1367-2630/ad5b7f","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5b7f","url":null,"abstract":"In the contemporary era, the advent of epidemics instigates a substantial upswing in relevant information dissemination, bolstering individuals’ resistance to infection by concurrently reducing activity contacts and reinforcing personal protective measures. To elucidate this intricate dynamics, we introduce a composite four-layer network model designed to capture the interplay among information-driven awareness, human activity, and epidemic spread, with a focus on the allocation of individuals’ limited attention in diminishing activity frequency and self-infection rates. One intriguing observation from our findings is an anomalous, concave non-monotonic relationship between awareness trade-off and epidemic spread, with a more pronounced prevalence at an intermediate least awareness efficacy. This underscores the inadvisability of relaxing self-protection through reduced activity frequency or compensating for increased activity frequency by enhancing self-protection. Especially noteworthy is the significance of enhancing self-protection in response to heightened information dissemination and inherent activity demands to curtail infection risk. However, in scenarios with increasing ancillary activity frequency, the emphasis should exclusively shift towards reducing activity exposure. The model establishes a theoretical threshold for accurately predicting awareness efficacy in epidemic outbreaks. Optimal awareness allocation consistently resides at the extremes—either completely avoiding unnecessary activity contact or adopting full self-protection. This guidance, contingent on information level and activity demand, offers valuable insights into the delicate balance between individual behaviors and epidemic prevention.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141518417","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

Quantum mechanical modeling of the multi-stage Stern–Gerlach experiment conducted by Frisch and Segrè 弗里施和塞格雷进行的斯特恩-格拉赫多级实验的量子力学建模

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-07-01 DOI: 10.1088/1367-2630/ad5906

S Süleyman Kahraman, Kelvin Titimbo, Zhe He, Jung-Tsung Shen and Lihong V Wang

引用次数: 0

Controlling many-body quantum chaos: Bose–Hubbard systems 控制多体量子混沌：玻色-哈伯德系统

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-06-30 DOI: 10.1088/1367-2630/ad5752

Lukas Beringer, Mathias Steinhuber, Juan Diego Urbina, Klaus Richter and Steven Tomsovic

{"title":"Controlling many-body quantum chaos: Bose–Hubbard systems","authors":"Lukas Beringer, Mathias Steinhuber, Juan Diego Urbina, Klaus Richter and Steven Tomsovic","doi":"10.1088/1367-2630/ad5752","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5752","url":null,"abstract":"This work develops a quantum control application of many-body quantum chaos for ultracold bosonic gases trapped in optical lattices. It is long known how to harness exponential sensitivity to changes in initial conditions for control purposes in classically chaotic systems. In the technique known as targeting, instead of a hindrance to control, the instability becomes a resource. Recently, this classical targeting has been generalized to quantum systems either by periodically countering the inevitable quantum state spreading or by introducing a control Hamiltonian, where both enable localized states to be guided along special chaotic trajectories toward any of a broad variety of desired target states. Only strictly unitary dynamics are involved; i.e. it gives a coherent quantum targeting. In this paper, the introduction of a control Hamiltonian is applied to Bose–Hubbard systems in chaotic dynamical regimes. Properly selected unstable mean field solutions can be followed particularly rapidly to states possessing precise phase relationships and occupancies. In essence, the method generates a quantum simulation technique that can access rather special states. The protocol reduces to a time-dependent control of the chemical potentials, opening up the possibility for application in optical lattice experiments. Explicit applications to custom state preparation and stabilization of quantum many-body scars are presented in one- and two-dimensional lattices (three-dimensional applications are similarly possible).","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141518420","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

Elementary proof of QAOA convergence QAOA 收敛性的基本证明

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-06-30 DOI: 10.1088/1367-2630/ad59bb

Lennart Binkowski, Gereon Koßmann, Timo Ziegler and René Schwonnek

引用次数: 0

Learning a quantum channel from its steady-state 从稳态学习量子通道

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-06-30 DOI: 10.1088/1367-2630/ad5464

Yigal Ilin and Itai Arad

引用次数: 0

Ansatz optimization of the variational quantum eigensolver tested on the atomic Anderson model 在原子安德森模型上测试的变分量子求解器的剖分优化

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-06-27 DOI: 10.1088/1367-2630/ad5a61

Giuseppe De Riso, Francesco Cipriani, Lorenzo Villani, Vincenzo Bisogno, Marco Lo Schiavo, Alfonso Romano and Canio Noce

{"title":"Ansatz optimization of the variational quantum eigensolver tested on the atomic Anderson model","authors":"Giuseppe De Riso, Francesco Cipriani, Lorenzo Villani, Vincenzo Bisogno, Marco Lo Schiavo, Alfonso Romano and Canio Noce","doi":"10.1088/1367-2630/ad5a61","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5a61","url":null,"abstract":"We present a detailed analysis and optimization of the variational quantum algorithms required to find the ground state of a correlated electron model, using several types of variational ansatz. Specifically, we apply our approach to the atomic limit of the Anderson model, which is widely studied in condensed matter physics since it can simulate fundamental physical phenomena, ranging from magnetism to superconductivity. The method is developed by presenting efficient state preparation circuits that exhibit total spin, spin projection, particle number and time-reversal symmetries. These states contain the minimal number of variational parameters needed to fully span the appropriate symmetry subspace allowing to avoid irrelevant sectors of Hilbert space. Then, we show how to construct quantum circuits, providing explicit decomposition and gate count in terms of standard gate sets. We test these quantum algorithms looking at ideal quantum computer simulations as well as implementing quantum noisy simulations. We finally perform an accurate comparative analysis among the approaches implemented, highlighting their merits and shortcomings.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507956","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

Chirality-enabled topological phase transitions in parity-time symmetric systems 奇偶时对称系统中的手性拓扑相变

IF 3.3 2区物理与天体物理

New Journal of Physics Pub Date : 2024-06-26 DOI: 10.1088/1367-2630/ad5a31

Yong Cao, Lijuan Sheng, Qiang Zhou, Rong Wang, Zhenkuan Chen and Xiaohui Ling

{"title":"Chirality-enabled topological phase transitions in parity-time symmetric systems","authors":"Yong Cao, Lijuan Sheng, Qiang Zhou, Rong Wang, Zhenkuan Chen and Xiaohui Ling","doi":"10.1088/1367-2630/ad5a31","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5a31","url":null,"abstract":"Photonic spin Hall effect (PSHE) in chiral PT-symmetric systems exhibits many exotic features, but the underlying physical mechanism has not been well elucidated. Here, through rigorous calculations based on full-wave theory, we reveal the physical mechanism of the exotic PSHE and identify a chirality-enabled topological phase transition. When circularly polarized light is incident on a chiral PT-symmetric system, the transmitted beam contains two components: a spin-flipped abnormal mode that acquires a geometric phase (exhibiting a vortex or a spin-Hall shift), and a spin-maintained normal mode that does not exhibit such a phase. If the phase difference between the cross-polarized Fresnel coefficients cannot be ignored, it results in a chirality-enabled phase and intensity distribution in the abnormal mode, which induces an exotic PSHE. Consequently, as the incident angle increases, a chirality-induced topological phase transition occurs, namely the transition from the vortex generation to the exotic PSHE. Finally, we confirm that the asymmetric and periodic PSHE in the chiral slab is also related to the phase difference between the cross-polarized Fresnel coefficients. These concepts and findings also provide an opportunity for unifying the phenomena of topological phase transitions in various spin-orbit photonic systems.","PeriodicalId":19181,"journal":{"name":"New Journal of Physics","volume":null,"pages":null},"PeriodicalIF":3.3,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507957","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