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Embedded Majorana islands 嵌入式马约拉纳岛
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-24 DOI: 10.1007/s11433-024-2418-2
Jin-Xing Hou, Alex Westström, Rui Wang, Wen-Li Yang, Jian Li
{"title":"Embedded Majorana islands","authors":"Jin-Xing Hou,&nbsp;Alex Westström,&nbsp;Rui Wang,&nbsp;Wen-Li Yang,&nbsp;Jian Li","doi":"10.1007/s11433-024-2418-2","DOIUrl":"10.1007/s11433-024-2418-2","url":null,"abstract":"<div><p>Mesoscopic superconducting islands hosting Majorana zero modes (MZMs), or Majorana islands in short, offer a prototype of topological qubits. In this work we investigate theoretically the model of a generic Majorana island tunneling-coupled to a single-piece metallic substrate, hence an <i>embedded Majorana island</i>. We show the crucial consequences of an interplay between the topological ground states nonlocally addressed by the MZMs and the metallic bath with coherent electron propagation: on the one hand, the topological degeneracy on the Majorana island can be preserved, by virtue of the particle-hole symmetry, despite the apparent bath-induced coupling between MZMs; on the other hand, the electronic interference in the metallic bath may lead to profound alterations to the renormalization group behavior of the hybrid system towards low energy/temperature compared with conventional Kondo physics. This work serves to establish the model of embedded Majorana islands as an experimentally relevant and theoretically intriguing problem particularly in the direction of topological quantum computation.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782855","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
A new twist to the interplay between superconductivity and Kondo correlation 超导与近藤相关性之间相互作用的新转折
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-24 DOI: 10.1007/s11433-024-2392-7
Gui-Lu Long
{"title":"A new twist to the interplay between superconductivity and Kondo correlation","authors":"Gui-Lu Long","doi":"10.1007/s11433-024-2392-7","DOIUrl":"10.1007/s11433-024-2392-7","url":null,"abstract":"","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141808678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Suppressing noisy features with quantum filters for efficient encoded images with high signal to noise ratios 利用量子滤波器抑制噪声特征，实现高信噪比的高效编码图像
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-23 DOI: 10.1007/s11433-024-2430-2
Gui-Lu Long
{"title":"Suppressing noisy features with quantum filters for efficient encoded images with high signal to noise ratios","authors":"Gui-Lu Long","doi":"10.1007/s11433-024-2430-2","DOIUrl":"10.1007/s11433-024-2430-2","url":null,"abstract":"","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141810499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Frustrated superconductivity and sextetting order 受挫超导性和六元序
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-22 DOI: 10.1007/s11433-024-2396-y
Zhiming Pan, Chen Lu, Fan Yang, Congjun Wu
{"title":"Frustrated superconductivity and sextetting order","authors":"Zhiming Pan,&nbsp;Chen Lu,&nbsp;Fan Yang,&nbsp;Congjun Wu","doi":"10.1007/s11433-024-2396-y","DOIUrl":"10.1007/s11433-024-2396-y","url":null,"abstract":"<div><p>The superconducting state typically favors a uniform spatial distribution akin to ferromagnetism. Nevertheless, the pair-density-wave state exhibits sign changes in the pairing order, leading to potential frustrations in phase coherence. We propose a mechanism to the sextetting order stemming from the frustrations in the phase coherence of a pair-density-wave state, whose spatial modulation manifests a vortex-antivortex honeycomb lattice. The classical ground state configurations are mapped to Baxter’s three-coloring model, revealing a macroscopic degeneracy accompanied by extensive entropy. The phase coherence problem intertwines the U(1) phases and the vorticity variables. While the resultant color and phase fluctuations suppress the pair-density-wave order, they maintain the sextetting order above the superconducting transition temperature (<i>T</i><sub>c</sub>). The 1/3-fractional vortex emerges as the fundamental topological defect in the sextetting order. This novel mechanism of frustrated superconductivity provides an alternative explanation for the experimental observed fractional oscillations in CsV<sub>3</sub>Sb<sub>5</sub>.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Physical neural networks with self-learning capabilities 具有自学能力的物理神经网络
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-22 DOI: 10.1007/s11433-024-2403-x
Weichao Yu, Hangwen Guo, Jiang Xiao, Jian Shen
{"title":"Physical neural networks with self-learning capabilities","authors":"Weichao Yu,&nbsp;Hangwen Guo,&nbsp;Jiang Xiao,&nbsp;Jian Shen","doi":"10.1007/s11433-024-2403-x","DOIUrl":"10.1007/s11433-024-2403-x","url":null,"abstract":"<div><p>Physical neural networks are artificial neural networks that mimic synapses and neurons using physical systems or materials. These networks harness the distinctive characteristics of physical systems to carry out computations effectively, potentially surpassing the constraints of conventional digital neural networks. A recent advancement known as “physical self-learning” aims to achieve learning through intrinsic physical processes rather than relying on external computations. This article offers a comprehensive review of the progress made in implementing physical self-learning across various physical systems. Prevailing learning strategies that contribute to the realization of physical self-learning are discussed. Despite challenges in understanding the fundamental mechanism of learning, this work highlights the progress towards constructing intelligent hardware from the ground up, incorporating embedded self-organizing and self-adaptive dynamics in physical systems.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Lorentz violation induces isospectrality breaking in Einstein-bumblebee gravity theory 洛伦兹违缺诱发爱因斯坦-大黄蜂引力理论的等谱破缺
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-22 DOI: 10.1007/s11433-024-2405-y
Wentao Liu, Xiongjun Fang, Jiliang Jing, Jieci Wang
{"title":"Lorentz violation induces isospectrality breaking in Einstein-bumblebee gravity theory","authors":"Wentao Liu,&nbsp;Xiongjun Fang,&nbsp;Jiliang Jing,&nbsp;Jieci Wang","doi":"10.1007/s11433-024-2405-y","DOIUrl":"10.1007/s11433-024-2405-y","url":null,"abstract":"<div><p>In this study, we investigate the quasinormal modes (QNMs) of a Lorentz-violating spacetime, factoring in a cosmological constant, within the framework of Einstein-bumblebee gravity. Our findings reveal that the interaction of spacetime with an anisotropic bumblebee field imparts distinct contributions to the axial and polar sectors of the vector perturbations. This subsequently breaks the isospectrality typically observed in vector modes. Numerical evidence strongly indicates isospectral breaking in the vector modes of Einstein-bumblebee black holes: a pronounced breakage in the real part of the frequencies, while the imaginary component seems less affected. This isospectral breaking indicates the existence of two different waveforms in the Ringdown phase of the black hole, which provides a potential signal of quantum gravity observable in current experiments.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Anomalous negative magnetoresistance in quantum dot Josephson junctions with Kondo correlations 具有 Kondo 相关性的量子点约瑟夫森结中的反常负磁电阻
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-22 DOI: 10.1007/s11433-024-2382-1
Mingtang Deng, Chunlin Yu, Guangyao Huang, Rosa López, Philippe Caroff, Sepideh Ghalamestani, Gloria Platero, Hongqi Xu
{"title":"Anomalous negative magnetoresistance in quantum dot Josephson junctions with Kondo correlations","authors":"Mingtang Deng,&nbsp;Chunlin Yu,&nbsp;Guangyao Huang,&nbsp;Rosa López,&nbsp;Philippe Caroff,&nbsp;Sepideh Ghalamestani,&nbsp;Gloria Platero,&nbsp;Hongqi Xu","doi":"10.1007/s11433-024-2382-1","DOIUrl":"10.1007/s11433-024-2382-1","url":null,"abstract":"<div><p>The interplay between superconductivity and the Kondo effect has stimulated significant interest in condensed matter physics. They compete when their critical temperatures are close and can give rise to a quantum phase transition that can mimic Majorana zero modes. Here, we have fabricated and measured Al-InSb nanowire quantum dot-Al devices. In the Kondo regime, a supercurrent-induced zero-bias conductance peak emerges. This zero-bias peak shows an anomalous negative magnetoresistance (NMR) at weak magnetic fields. We attribute this anomalous NMR to quasiparticle trapping at vortices in the superconductor leads as a weak magnetic field is applied. The trapping effect lowers the quasiparticle-caused dissipation and thus enhances the Josephson current. This work connects the vortex physics and the supercurrent tunneling in Kondo regimes and can help further understand the physics of Josephson quantum dot system.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Nonexistence of quantum black and white hole horizons in an improved dynamic approach 改进的动态方法中量子黑洞和白洞地平线的不存在性
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-19 DOI: 10.1007/s11433-024-2386-3
Wen-Cong Gan, Xiao-Mei Kuang, Zhen-Hao Yang, Yungui Gong, Anzhong Wang, Bin Wang
{"title":"Nonexistence of quantum black and white hole horizons in an improved dynamic approach","authors":"Wen-Cong Gan,&nbsp;Xiao-Mei Kuang,&nbsp;Zhen-Hao Yang,&nbsp;Yungui Gong,&nbsp;Anzhong Wang,&nbsp;Bin Wang","doi":"10.1007/s11433-024-2386-3","DOIUrl":"10.1007/s11433-024-2386-3","url":null,"abstract":"<div><p>In this paper, we study the quantum geometric effects near the locations where classical black hole horizons used to appear in Einstein’s classical theory, within the framework of an improved dynamic approach, in which the internal region of a black hole is modeled by the Kantowski-Sachs (KS) spacetime and the two polymerization parameters are functions of the phase space variables. Our detailed analysis shows that the effects are so strong that black and white hole horizons of the effective quantum theory do not exist at all and instead are replaced by transition surfaces, across which the metric coefficients and their inverses are smooth and remain finite, as are the corresponding curvatures, including the Kretschmann scalar. These surfaces always separate trapped regions from anti-trapped regions. The number of such surfaces is infinite, so the corresponding KS spacetimes become geodesically complete, and no black and white hole-like structures exist in this scheme.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Bayesian inference of neutron-skin thickness and neutron-star observables based on effective nuclear interactions 基于有效核相互作用的中子皮厚度和中子星观测值的贝叶斯推断
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-19 DOI: 10.1007/s11433-024-2406-4
Jia Zhou, Jun Xu
{"title":"Bayesian inference of neutron-skin thickness and neutron-star observables based on effective nuclear interactions","authors":"Jia Zhou,&nbsp;Jun Xu","doi":"10.1007/s11433-024-2406-4","DOIUrl":"10.1007/s11433-024-2406-4","url":null,"abstract":"<div><p>We have obtained the constraints on the density dependence of the symmetry energy from neutron-skin thickness data by parity-violating electron scatterings and neutron-star observables using a Bayesian approach, based on the standard Skyrme-Hartree-Fock (SHF) model and its extension as well as the relativistic mean-field (RMF) model. While the neutron-skin thickness data (neutron-star observables) mostly constrain the symmetry energy at subsaturation (suprasaturation) densities, they may more or less constrain the behavior of the symmetry energy at suprasaturation (subsaturation) densities, depending on the energy-density functional form. Besides showing the final posterior density dependence of the symmetry energy, we also compare the slope parameters of the symmetry energy at 0.10 fm<sup>−3</sup> as well as the values of the symmetry energy at twice saturation density from three effective nuclear interactions. The present work serves as a comparison study based on relativistic and non-relativistic energy-density functionals, for constraining the nuclear symmetry energy from low to high densities using a Bayesian approach.</p></div>","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141782858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
Exploring new physics in ultra-peripheral heavy ion collisions 探索超外围重离子碰撞中的新物理学
IF 6.4 1区 物理与天体物理
Science China Physics, Mechanics & Astronomy Pub Date : 2024-07-19 DOI: 10.1007/s11433-024-2393-0
Bo-Wen Xiao
{"title":"Exploring new physics in ultra-peripheral heavy ion collisions","authors":"Bo-Wen Xiao","doi":"10.1007/s11433-024-2393-0","DOIUrl":"10.1007/s11433-024-2393-0","url":null,"abstract":"","PeriodicalId":774,"journal":{"name":"Science China Physics, Mechanics & Astronomy","volume":null,"pages":null},"PeriodicalIF":6.4,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141823274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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
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