New Journal of Physics最新文献_第3页

Nontrivial $d$-electrons driven superconductivity of transition metal diborides 过渡金属二硼化物的非琐d电子驱动超导性

New Journal of Physics Pub Date : 2024-06-12 DOI: 10.1088/1367-2630/ad5754

wang yu, Ju-Hong Tang, Hong-Rui Xu, Guanghui Zhou, G. Ouyang, Hui-Xiong Deng, R. D’Agosta, Kaike Yang

{"title":"Nontrivial $d$-electrons driven superconductivity of transition metal diborides","authors":"wang yu, Ju-Hong Tang, Hong-Rui Xu, Guanghui Zhou, G. Ouyang, Hui-Xiong Deng, R. D’Agosta, Kaike Yang","doi":"10.1088/1367-2630/ad5754","DOIUrl":"https://doi.org/10.1088/1367-2630/ad5754","url":null,"abstract":"\u0000 Leveraging the progress of first-principles modellings in understanding the mechanisms of superconductivity of materials, in this work we investigate the phonon-mediated superconducting properties of transition metal diborides. We report that TaB$_2$ and NbB$_2$ show superconducting transition temperatures as high as 27.0 and 26.0~K at ambient conditions, respectively, comparable with those obtained for CaB$_2$ or MgB$_2$. By mode-by-mode analysis of the electron-phonon-coupling, we reveal that the high superconducting temperature of transition metal diborides is due mainly to the strong coupling between $d$ electrons of the transition metals and the acoustic phonon modes along out-of-plane vibrations. This fact is distinct from that of CaB$_2$ or MgB$_2$, where the superconductivity stems mainly from the boron $p_x$ and $p_y$ orbitals, which couple strongly to the optical phonon modes dominated by in-plane B atomic vibrations. Further, we find that transition metal diborides present only a superconducting gap at low temperatures, whereas CaB$_2$ or MgB$_2$ are double superconducting gap superconductors. In addition, we investigate the strain effect on the superconducting transition temperatures of diborides, predicting that $T_c$ can be further enhanced by optimizing the phonon and electronic interactions. This study sheds some light on the exploring high $T_c$ boron-based superconductor materials.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"35 51","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141354372","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

Topological charge pumping in tetramerized Kitaev chains with nodal loop in parameter space 参数空间中带有节点环的四聚合基塔耶夫链中的拓扑电荷泵浦

New Journal of Physics Pub Date : 2024-06-11 DOI: 10.1088/1367-2630/ad56c1

En Suo Ma, Z. Song

引用次数: 0

Spatial coherent manipulation of Bessel-like vector vortex beam in atomic vapor 原子蒸汽中贝塞尔样矢量涡束的空间相干操纵

New Journal of Physics Pub Date : 2024-06-11 DOI: 10.1088/1367-2630/ad56be

Xinji Zeng, Zhuang Li, Xin Yang, Jianyi Xu, Jinwen Wang, Chengyuan Wang, Quan Quan, Haixia Chen, Dong Wei, Hong Gao, Fuli Li

引用次数: 0

Highly elastic fibers in a shear flow can form double helices 剪切流中的高弹性纤维可形成双螺旋

New Journal of Physics Pub Date : 2024-06-11 DOI: 10.1088/1367-2630/ad56c0

A. Słowicka, Nan Xue, Lujia Liu, J. Nunes, Pawel Sznajder, H. A. Stone, M. Ekiel-Jeżewska

引用次数: 0

Anomalous Hall effect sensitive to magnetic monopoles and skyrmion helicity in spin-orbit coupled systems 反常霍尔效应对自旋轨道耦合系统中的磁单极子和天磁驰度敏感

New Journal of Physics Pub Date : 2024-06-07 DOI: 10.1088/1367-2630/ad557f

Jun Mochida, H. Ishizuka

引用次数: 0

LOCC convertibility of entangled states in infinite-dimensional systems 无穷维系统中纠缠态的 LOCC 可转换性

New Journal of Physics Pub Date : 2024-05-24 DOI: 10.1088/1367-2630/ad503d

César Massri, Guido Bellomo, Hector Freytes, Roberto Giuntini, Giuseppe Sergioli, Gustavo Martin Bosyk

{"title":"LOCC convertibility of entangled states in infinite-dimensional systems","authors":"César Massri, Guido Bellomo, Hector Freytes, Roberto Giuntini, Giuseppe Sergioli, Gustavo Martin Bosyk","doi":"10.1088/1367-2630/ad503d","DOIUrl":"https://doi.org/10.1088/1367-2630/ad503d","url":null,"abstract":"\u0000 We advance on the conversion of bipartite quantum states via local operations and classical communication for infinite-dimensional systems. We introduce δ-convertibility based on the observation that any pure state can be approximated by a state with finite-support Schmidt coefficients. We show that δ-convertibility of bipartite states is fully characterized by a majorization relation between the sequences of squared Schmidt coefficients, providing a novel extension of Nielsen's theorem for infinite-dimensional systems. Hence, our definition is equivalent to the one of ε-convertibility [Quantum Inf. Comput. textbf{8}, 0030 (2008)], but deals with states having finitely supported sequences of Schmidt coefficients. Additionally, we discuss the notions of optimal common resource and optimal common product in this scenario. The optimal common product always exists, whereas the optimal common resource depends on the existence of a common resource. This highlights a distinction between the resource-theoretic aspects of finite versus infinite-dimensional systems. Our results rely on the order-theoretic properties of majorization for infinite sequences, applicable beyond the LOCC convertibility problem.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"10 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141100821","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

Quantum tricriticality in a generalized quantum Rabi system 广义量子拉比系统中的量子三临界性

New Journal of Physics Pub Date : 2024-05-24 DOI: 10.1088/1367-2630/ad503c

You-qi Lu, Yu-Yu Zhang

引用次数: 0

Electron-phonon coupling and a resonant-like optical observation of a band inversion in topological crystal insulator Pb1-xSnxSe 拓扑晶体绝缘体 Pb1-xSnxSe 中的电子-声子耦合和带反转的共振样光学观测

New Journal of Physics Pub Date : 2024-05-23 DOI: 10.1088/1367-2630/ad4fba

M. Woźny, Wojciech Szuszkiewicz, M. Dyksik, Marcin Motyka, A. Szczerbakow, W. Bardyszewski, Tomasz Story, Józef Cebulski

{"title":"Electron-phonon coupling and a resonant-like optical observation of a band inversion in topological crystal insulator Pb1-xSnxSe","authors":"M. Woźny, Wojciech Szuszkiewicz, M. Dyksik, Marcin Motyka, A. Szczerbakow, W. Bardyszewski, Tomasz Story, Józef Cebulski","doi":"10.1088/1367-2630/ad4fba","DOIUrl":"https://doi.org/10.1088/1367-2630/ad4fba","url":null,"abstract":"\u0000 The optical reflectivity of n-type Pb0.865Sn0.135Se and Pb0.75Sn0.25Se solid solutions was measured in the THz spectral region energetically corresponding to optical phonon excitations and in the temperature range from 40 K to 280 K. The first solid solution exhibits an open energy gap with trivial band ordering at all temperatures, while for the second one the transition from trivial insulator to topological crystal insulator phase is expected. The analysis of Pb0.75Sn0.25Se data performed within the dynamic dielectric function formalism revealed an anomaly of resonance-like character in the temperature dependence of LO phonon frequency. The formula for LO phonon energy renormalization reproduced observed anomaly for energy gap equal to zero, the phase transition occurred at T0 = (172 ± 2) K. This effect was absent for Pb0.865Sn0.135Se. Present results show that reflectivity measurements in the THz range in the vicinity of LO phonon frequency can be valuable experimental method for precise determining of band inversion temperature in narrow-gap topological materials.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"26 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141107368","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

Delocalization and higher-order topology in a nonlinear elastic lattice 非线性弹性晶格中的去焦化和高阶拓扑结构

New Journal of Physics Pub Date : 2024-05-22 DOI: 10.1088/1367-2630/ad4f07

Jianlin Yi, Changqing Chen

{"title":"Delocalization and higher-order topology in a nonlinear elastic lattice","authors":"Jianlin Yi, Changqing Chen","doi":"10.1088/1367-2630/ad4f07","DOIUrl":"https://doi.org/10.1088/1367-2630/ad4f07","url":null,"abstract":"\u0000 Topological elastic waves provide novel and robust ways for manipulating mechanical energy transfer and information transmission, with potential applications in vibration control, analog computation, and more. Recently discovered higher-order topological insulators (HOTIs) with multidimensional and hierarchical edge states can further expand the capabilities of topological elastic waves. However, the effects of nonlinearity on elastic HOTIs remain elusive. In this paper, we propose a nonlinear elastic higher-order topological Kagome lattice. After briefly reviewing its linear properties, we explore the effects of nonlinearity on the higher-order band topology and topological states. To do this, we have developed a method to calculate approximate nonlinear modes in order to identify the bulk polarization and probe the higher-order topological phase in the nonlinear lattice. We find that nonlinearity induces unusual delocalization of topological corner states, band crossing, and higher-order topological phase transition. The delocalization reveals that intracell hardening nonlinearity leads to direct delocalization of topological corner states while intracell softening nonlinearity first enhances and then reduces localization. The nonlinear higher-order topological phase is amplitude dependent, and we demonstrate a transition from a trivial to a non-trivial phase, enabling amplitude induced topological corner and edge states. Additionally, this phase transition corresponds to the closing and reopening of the bandgap, accompanied by an unusual band crossing. By examining the band topology before and after the band crossing, we find that the bulk polarization becomes quantized with respect to amplitude and can predict higher-order topological phases in nonlinear lattices. The obtained results are expected to be beneficial for the development of tunable and robust elastic wave devices.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"3 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141110301","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

Hund’s three Rules in Actinide-Containing Superatoms with Spin-Orbit Coupling Calculations 利用自旋轨道耦合计算含放线菌超原子中的亨氏三法则

New Journal of Physics Pub Date : 2024-05-21 DOI: 10.1088/1367-2630/ad4e5b

Xiaoxue Zhong, Peng Wang, Ruizhi Qiu, Hong-Kuan Yuan

{"title":"Hund’s three Rules in Actinide-Containing Superatoms with Spin-Orbit Coupling Calculations","authors":"Xiaoxue Zhong, Peng Wang, Ruizhi Qiu, Hong-Kuan Yuan","doi":"10.1088/1367-2630/ad4e5b","DOIUrl":"https://doi.org/10.1088/1367-2630/ad4e5b","url":null,"abstract":"\u0000 The intriguing and challenge issue in magnetic superatoms is searching for the suitable candidates to validate the Hund’s rules. Here, early actinide elements (An: Ac, Th, Pa, U, Np, Pu, Am) whose 5f electrons may crossover the localization and delocalization characteristics have been chosen to alloy with Al atoms in designing magnetic An@Al12 superatoms. By doing the global minimum structure search and the spin-orbital coupling (SOC) density functional theory (DFT) calculations, we provide an original idea to give theoretical argument that Hund’s three rules are still applicable in superatoms, which can be related to the fillings of highly localized An-5f orbitals into large exchange-splitting 2F superatom orbitals. Specifically, selective 5f sub-orbitals of several An dopants can exhibit a dual nature in superatomic bonding, i.e., partial 5f electrons of Pa and Pu are reactive whereas all 5f electrons of U, Np and Am are highly localized. The molecular orbital analyses, combined with the qualitative interpretation of the phenomenological superatom sub-shell model, address the intricate interplays between the structure symmetry, electronic structure, spin and orbital magnetic moments. These findings have important implications for understanding the bonding and magnetic behaviors of An-containing superatoms and pave the way for designing novel magnetic superatoms.","PeriodicalId":508829,"journal":{"name":"New Journal of Physics","volume":"17 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141114242","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