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Chains of magnetic atoms, placed on the surface of s-wave superconductors, have been established as a laboratory for the study of Majorana bound states. In such systems, the breaking of time reversal due to magnetic moments gives rise to…

超导电性 · 物理学 2021-07-16 Andreas Kreisel , Timo Hyart , Bernd Rosenow

Magnetic topological materials are a class of compounds which can host massless electrons controlled by the magnetic order. One such compound is EuZn$_2$Sb$_2$, which has recently garnered interest due to its strong interplay between the Eu…

The intense search for topological superconductivity is inspired by the prospect that it hosts Majorana quasiparticles. We explore in this work the optimal design for producing topological superconductivity by combining a quantum Hall state…

介观与纳米尺度物理 · 物理学 2019-03-27 Gun Sang Jeon , J. K. Jain , C. -X. Liu

One-dimensional (1D) topological superconductivity is a state of matter that is not found in nature. However, it can be realised, for example, by inducing superconductivity into the quantum spin Hall edge state of a two-dimensional…

Topological superconductors (TSCs), with the capability to host Majorana bound states that can lead to non-Abelian statistics and application in quantum computation, have been one of the most intensively studied topics in condensed matter…

Recent advances in electron spin resonance techniques have allowed the manipulation of the spin of individual atoms, making magnetic atomic chains on superconducting hosts one of the most promising platform where topological…

Superconductivity in topological materials has attracted a great deal of interest in both electron physics and material sciences since the theoretical predictions that Majorana fermions can be realized in topological superconductors [1-4].…

超导电性 · 物理学 2015-11-16 Xiaoyan Shi , Wenlong Yu , Zhigang Jiang , B. Andrei Bernevig , W. Pan , S. D. Hawkins , J. F. Klem

There have been several proposals for platforms sustaining topological superconductivity in high temperature superconductors, in order to make use of the larger superconducting gap and the expected robustness of Majorana zero modes towards…

超导电性 · 物理学 2024-07-29 Mainak Pal , Andreas Kreisel , P. J. Hirschfeld

A topological superconductor features at its boundaries and vortices Majorana fermions, which are potentially applicable for topological quantum computations. The scarcity of the known experimentally verified physical systems with…

超导电性 · 物理学 2020-03-18 Minseong Lee , Hyun-Jae Lee , Jun Hee Lee , Suk Bum Chung

The interplay of BCS superconductivity and nontrivial band topology is expected to give rise to opportunities for creating topological superconductors, achieved through pairing spin-filtered boundary modes via superconducting proximity…

The engineering of non-trivial topology in superconducting heterostructures is a very challenging task. Reducing the number of components in the system would facilitate the creation of the long-sought Majorana bound states. Here, we explore…

超导电性 · 物理学 2022-06-20 Stefan Rex , Roland Willa

We have performed angle-resolved photoemission spectroscopy (ARPES) on Cux(PbSe)5(Bi2Se3)6 (CPSBS; x = 1.47), a superconductor derived from a topological insulator heterostructure, to elucidate the electronic states relevant to the…

介观与纳米尺度物理 · 物理学 2015-10-28 K. Nakayama , H. Kimizuka , Y. Tanaka , T. Sato , S. Souma , T. Takahashi , Satoshi Sasaki , Kouji Segawa , Yoichi Ando

Topological superconductivity emerges in chains or arrays of magnetic atoms coupled to a superconductor. However, the external controllability of such systems with gate voltages is detrimental for their future implementation in a…

We propose an alternative route to transport experiments for detecting Majorana bound states (MBSs) by combining topological superconductivity with quantum optics in a superconducting $pn$ junction containing a quantum dot (QD). We consider…

介观与纳米尺度物理 · 物理学 2022-12-02 L. Bittermann , C. De Beule , D. Frombach , P. Recher

A topological superconductor (TSC) is characterized by the topologically-protected gapless surface state that is essentially an Andreev bound state consisting of Majorana fermions. While a TSC has not yet been discovered, the doped…

超导电性 · 物理学 2011-11-16 Satoshi Sasaki , M. Kriener , Kouji Segawa , Keiji Yada , Yukio Tanaka , Masatoshi Sato , Yoichi Ando

Recent tunneling conductance measurements on semiconductor-superconductor nanowires find zero-bias peaks to be ubiquitous across wide ranges of chemical potential and Zeeman energy. Motivated by this, we demonstrate that…

介观与纳米尺度物理 · 物理学 2019-09-11 Benjamin D. Woods , Jun Chen , Sergey M. Frolov , Tudor D. Stanescu

Recently, the search for Majorana fermions (MFs) has become one of the most important and exciting issues in condensed matter physics since such an exotic quasiparticle is expected to potentially give rise to unprecedented quantum phenomena…

超导电性 · 物理学 2015-05-22 Satoshi Sasaki , Takeshi Mizushima

We propose a new type of topological states of matter exhibiting topologically nontrivial edge states (ESs) within gapless bulk states (GBSs) protected by both spin rotational and reflection symmetries. A model presenting such states is…

介观与纳米尺度物理 · 物理学 2019-04-23 Masoud Bahari , Mir Vahid Hosseini

Majorana Fermions, strange particles that are their own antiparticles, were predicted in 1937 and have been sought after ever since. In condensed matter they are predicted to exist as vortex core or edge excitations in certain exotic…

超导电性 · 物理学 2013-08-12 Aaron Farrell , T. Pereg-Barnea

In conventional superconductors, electrons of opposite spins are bound into Cooper pairs. However, when the superconductor is in contact with a non-uniformly ordered ferromagnet, an exotic type of superconductivity can appear at the…