Reports on progress in physics. Physical Society (Great Britain)最新文献_第7页

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-09-09 DOI: 10.1088/1361-6633/ad7058

Chao Xu, Yixin Ma, Shenghan Jiang

{"title":"Unveiling correlated two-dimensional topological insulators through fermionic tensor network states-classification, edge theories and variational wavefunctions.","authors":"Chao Xu, Yixin Ma, Shenghan Jiang","doi":"10.1088/1361-6633/ad7058","DOIUrl":"10.1088/1361-6633/ad7058","url":null,"abstract":"The study of topological band insulators has revealed fascinating phases characterized by band topology indices and anomalous boundary modes protected by global symmetries. In strongly correlated systems, where the traditional notion of electronic bands becomes obsolete, it has been established that topological insulator phases persist as stable phases, separate from the trivial insulators. However, due to the inability to express the ground states of such systems as Slater determinants, the formulation of generic variational wave functions for numerical simulations is highly desirable. In this paper, we tackle this challenge for two-dimensional topological insulators by developing a comprehensive framework for fermionic tensor network states. Starting from simple assumptions, we obtain possible sets of tensor equations for any given symmetry group, capturing consistent relations governing symmetry transformation rules on tensor legs. We then examine the connection between these tensor equations andnon-chiraltopological insulators by constructing edge theories and extracting quantum anomaly data from each set of tensor equations. By exhaustively exploring all possible sets of equations, we achieve a systematic classification of non-chiral topological insulator phases. Imposing the solutions of a given set of equations onto local tensors, we obtain generic variational wavefunctions for the corresponding topological insulator phases. Our methodology provides an important step toward simulating topological insulators in strongly correlated systems. We discuss the limitations and potential generalizations of our results, paving the way for further advancements in this field.","PeriodicalId":74666,"journal":{"name":"Reports on progress in physics. Physical Society (Great Britain)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141997051","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}

引用次数: 0

Emergent symmetry in TbTe₃revealed by ultrafast reflectivity under anisotropic strain. 各向异性应变下的超快反射率揭示了碲化镉中的新兴对称性。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-09-02 DOI: 10.1088/1361-6633/ad71ee

Soyeun Kim, Gal Orenstein, Anisha G Singh, Ian R Fisher, David A Reis, Mariano Trigo

引用次数: 0

Observation ofγγ→ττin proton-proton collisions and limits on the anomalous electromagnetic moments of the τ lepton. 质子-质子碰撞中γγ→ττ的观测以及对τ轻子反常电磁矩的限制。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-09-02 DOI: 10.1088/1361-6633/ad6fcb

The Cms Collaboration

引用次数: 0

Topological Anderson phases in heat transport. 热传输中的拓扑安德森相。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-08-23 DOI: 10.1088/1361-6633/ad6d88

He Gao, Guoqiang Xu, Xue Zhou, Shuihua Yang, Zhongqing Su, Cheng-Wei Qiu

引用次数: 0

Generally applicable physics-based equation of state for liquids. 普遍适用的基于物理学的液体状态方程。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-08-22 DOI: 10.1088/1361-6633/ad6a80

J E Proctor, Kostya Trachenko

{"title":"Generally applicable physics-based equation of state for liquids.","authors":"J E Proctor, Kostya Trachenko","doi":"10.1088/1361-6633/ad6a80","DOIUrl":"10.1088/1361-6633/ad6a80","url":null,"abstract":"Physics-based first-principles pressure-volume-temperature equations of state (EOS) exist for solids and gases but not for liquids due to the long-standing fundamental problems involved in liquid theory. Current EOS models that are applicable to liquids and supercritical fluids at liquid-like density under conditions relevant to planetary interiors and industrial processes are complex empirical models with many physically meaningless adjustable parameters. Here, we develop a generally applicable physics-based (GAP) EOS for liquids including supercritical fluids at liquid-like density. The GAP equation is explicit in the internal energy, and hence links the most fundamental macroscopic static property of fluids, the pressure-volume-temperature EOS, to their key microscopic property: the molecular hopping frequency or liquid relaxation time, from which the internal energy can be obtained. We test our GAP equation against available experimental data in several different ways and find good agreement. Our GAP equation, unavoidably and similarly to solid EOS, contains a semi-empirical term giving the energy of the static sample as a function of volume only (EST(V)). Our testing includes studies along isochores, in order to examine the validity of the GAP equation independently of the validity of any function we may choose to utilize forEST(V). The only other adjustable parameter in the equation is the Grüneisen parameter for the fluid. We observe that the GAP equation is similar to the Mie-Grüneisen solid EOS in a wide range of the liquid phase diagram. This similarity is ultimately related to the condensed state of these two phases. On the other hand, the differences between the GAP equation and EOS for gases are fundamental. Finally, we identify the key gaps in the experimental data that need to be filled in to proceed further with the liquid EOS.","PeriodicalId":74666,"journal":{"name":"Reports on progress in physics. Physical Society (Great Britain)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141879892","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}

引用次数: 0

Dynamically generated decoherence-free subspaces and subsystems on superconducting qubits. 超导量子比特上动态生成的无退相干子空间和子系统。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-08-14 DOI: 10.1088/1361-6633/ad6805

Gregory Quiroz, Bibek Pokharel, Joseph Boen, Lina Tewala, Vinay Tripathi, Devon Williams, Lian-Ao Wu, Paraj Titum, Kevin Schultz, Daniel Lidar

{"title":"Dynamically generated decoherence-free subspaces and subsystems on superconducting qubits.","authors":"Gregory Quiroz, Bibek Pokharel, Joseph Boen, Lina Tewala, Vinay Tripathi, Devon Williams, Lian-Ao Wu, Paraj Titum, Kevin Schultz, Daniel Lidar","doi":"10.1088/1361-6633/ad6805","DOIUrl":"10.1088/1361-6633/ad6805","url":null,"abstract":"Decoherence-free subspaces and subsystems (DFS) preserve quantum information by encoding it into symmetry-protected states unaffected by decoherence. An inherent DFS of a given experimental system may not exist; however, through the use of dynamical decoupling (DD), one can induce symmetries that support DFSs. Here, we provide the first experimental demonstration of DD-generated decoherence-free subsystem logical qubits. Utilizing IBM Quantum superconducting processors, we investigate two and three-qubit DFS codes comprising up to six and seven noninteracting logical qubits, respectively. Through a combination of DD and error detection, we show that DFS logical qubits can achieve up to a 23% improvement in state preservation fidelity over physical qubits subject to DD alone. This constitutes a beyond-breakeven fidelity improvement for DFS-encoded qubits. Our results showcase the potential utility of DFS codes as a pathway toward enhanced computational accuracy via logical encoding on quantum processors.","PeriodicalId":74666,"journal":{"name":"Reports on progress in physics. Physical Society (Great Britain)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141768218","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}

引用次数: 0

Liquid crystals from curved colloidal rods: waves, twists and more. 来自弯曲胶体棒的液晶：波浪、扭曲和更多

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-08-12 DOI: 10.1088/1361-6633/ad627b

Carla Fernández-Rico, Roel P A Dullens

{"title":"Liquid crystals from curved colloidal rods: waves, twists and more.","authors":"Carla Fernández-Rico, Roel P A Dullens","doi":"10.1088/1361-6633/ad627b","DOIUrl":"10.1088/1361-6633/ad627b","url":null,"abstract":"The curvature of elongated microscopic building blocks plays a crucial role on their self-assembly into orientationally ordered phases. While rod-like molecules form a handful of liquid crystal (LC) phases, curved or banana-shaped molecules show more than fifty phases, with fascinating physical properties, such as chirality or polarity. Despite the fundamental and technological importance of these so-called 'banana-shaped liquid crystals', little is known about their microscopic details at the single-molecule level. Curved colloidal liquid crystals-liquid crystals formed by curved colloidal rods-are excellent model systems to optically resolve the structure and dynamics of curved building blocks within these condensed phases. Recent advances in the synthesis of curved rod-like particles have unlocked the potential for studying-at the single-particle level-the intimate relationship between shape and phase symmetry, and even confirmed the stability of elusive LC phases. Further developments in this nascent field promise exciting findings, such as the first observation of the colloidal twist-bend nematic phase or the fabrication of functional materials with curvature-dependent properties. In this Report on Progress, we will highlight recent advances in the synthesis and assembly of curved colloidal liquid crystals and discuss the upcoming challenges and opportunities of this field.","PeriodicalId":74666,"journal":{"name":"Reports on progress in physics. Physical Society (Great Britain)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141602298","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}

引用次数: 0

Emergent phases in graphene flat bands. 石墨烯平带中的新兴相位。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-08-09 DOI: 10.1088/1361-6633/ad67ed

Saisab Bhowmik, Arindam Ghosh, U Chandni

{"title":"Emergent phases in graphene flat bands.","authors":"Saisab Bhowmik, Arindam Ghosh, U Chandni","doi":"10.1088/1361-6633/ad67ed","DOIUrl":"10.1088/1361-6633/ad67ed","url":null,"abstract":"Electronic correlations in two-dimensional materials play a crucial role in stabilising emergent phases of matter. The realisation of correlation-driven phenomena in graphene has remained a longstanding goal, primarily due to the absence of strong electron-electron interactions within its low-energy bands. In this context, magic-angle twisted bilayer graphene has recently emerged as a novel platform featuring correlated phases favoured by the low-energy flat bands of the underlying moiré superlattice. Notably, the observation of correlated insulators and superconductivity, and the interplay between these phases have garnered significant attention. A wealth of correlated phases with unprecedented tunability was discovered subsequently, including orbital ferromagnetism, Chern insulators, strange metallicity, density waves, and nematicity. However, a comprehensive understanding of these closely competing phases remains elusive. The ability to controllably twist and stack multiple graphene layers has enabled the creation of a whole new family of moiré superlattices with myriad properties. Here, we review the progress and development achieved so far, encompassing the rich phase diagrams offered by these graphene-based moiré systems. Additionally, we discuss multiple phases recently observed in non-moiré multilayer graphene systems. Finally, we outline future opportunities and challenges for the exploration of hidden phases in this new generation of moiré materials.","PeriodicalId":74666,"journal":{"name":"Reports on progress in physics. Physical Society (Great Britain)","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141768219","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}

引用次数: 0

Present and future ofCosmoLattice. CosmoLattice 的现状与未来。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-08-05 DOI: 10.1088/1361-6633/ad616a

Daniel G Figueroa, Adrien Florio, Francisco Torrenti

引用次数: 0

Quantum illumination and quantum radar: a brief overview. 量子照明和量子雷达：概述。

Reports on progress in physics. Physical Society (Great Britain) Pub Date : 2024-08-01 DOI: 10.1088/1361-6633/ad6279

Athena Karsa, Alasdair Fletcher, Gaetana Spedalieri, Stefano Pirandola

引用次数: 0