Robust Zero Energy Modes on Superconducting Bismuth Islands Deposited on Fe(Te,Se)

Chen, Xiaoyu; Chen, Mingyang; Duan, Wen Shan; Yang, Huan; Wen, Hao

doi:10.1021/acs.nanolett.9b04639

Cited by 9 publications

(4 citation statements)

References 47 publications

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“…7) possibilities of intrinsic topological superconductivity [286,287]. 8) studies of heterostructures that combine a Fe(Te,Se) single crystal with a topological material [288][289][290][291][292]. 9) improvement of sample quality [293].…”

Section: Discussionmentioning

confidence: 99%

Emergent vortex Majorana zero mode in iron-based superconductors

Kong¹,

Ding²

2020

Acta Phys. Sin.

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The vortex of iron-based superconductors is emerging as a promising platform for Majorana zero mode, owing to a magic integration among intrinsic vortex winding, non-trivial band topology, strong electron-electron correlations, high-Tc superconductivity and the simplification of single material. It overcomes many difficulties suffered in heterostructure-based Majorana platforms, including small topological gap, interfacial contamination, lattice imperfections, and etc. Isolated zero-bias peaks have been found in vortex of several iron-based superconductors. So far, studies from both experimental and theoretical aspects strongly indicate the realization of vortex Majorana zero mode, with a potential to be applied to fault-tolerant quantum computation. By taking Fe(Te,Se) superconductor as an example, here we review the original idea and research progress of Majorana zero modes in this new platform. After introducing the identifications of topological band structure and real zero modes in vortex, we summarize the physics behaviors of vortex Majorana zero modes systematically. First, relying on the behavior of the zero mode wave function and evidence of quasiparticle poisoning, we analyze the mechanism of emergence of vortex Majorana zero modes. Secondly, assisted with some well-established theories, we elaborate the measurements on "Majorana symmetry" and topological nature of vortex Majorana zero modes. After that, we switch from quantum physics to quantum engineering, and analyze the performance of vortex Majorana zero modes under real circumstances, which may potentially benefit the exploration of practical applications in the future. This review follows the physics properties of vortex Majorana zero modes, especially emphasizes the link between phenomena and mechanisms. It provides a chance to bridge the gap between the well-established theories and the newly discovered "iron home" of Majoranas.

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Section: Discussionmentioning

confidence: 99%

Emergent vortex Majorana zero mode in iron-based superconductors

Kong¹,

Ding²

2020

Acta Phys. Sin.

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“…Experimentally pursuing Majorana zero-mode almost immediately began after the theoretical ideas were proposed, and a large number of observations of possible Majorana signatures have been reported. The two most extensively utilized experimental techniques are the transport measurements in semiconductor-superconductor hybrids and the scanning-tunneling-microscope based measurements on various materials [57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75]. As we mentioned above, this review will focus on the first branch, though some relevant experiments of the second branch will also be discussed.…”

Section: Introductionmentioning

confidence: 99%

Experimental review on Majorana zero-modes in hybrid nanowires

Zhang

et al. 2021

Sci. China Phys. Mech. Astron.

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As the condensed matter analog of Majorana fermion, the Majorana zero-mode is well known as a building block of fault-tolerant topological quantum computing. This review focuses on the recent progress of Majorana experiments, especially experiments about semiconductor-superconductor hybrid devices. We first sketch Majorana zero-mode formation from a bottom-up view, which is more suitable for beginners and experimentalists. Then, we survey the status of zero-energy state signatures reported recently, from zero-energy conductance peaks, the oscillations, the quantization, and the interactions with extra degrees of freedom. We also give prospects of future experiments for advancing one-dimensional semiconductor nanowire-superconductor hybrid materials and devices.

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“…Then, Majorana fermions emerge at the edge of the superconductor. Recently, the observations of MZM in the core of a vortex [23,24], at the end of an atomic defect line [25], near the Bi islands [26], and near interstitial Fe atoms [27] in the simplest Fe-based superconductor Fe 1+y Te 0.5 Se 0.5 (T c = 14 K) [28] have motivated searches for similar systems. TlSb crystallizes in a cubic CsCl structure with space group Pm3m (No.…”

Section: Introductionmentioning

confidence: 99%

Bulk superconductivity in the Dirac semimetal TlSb

Zhou

Lou

et al. 2021

Sci. China Phys. Mech. Astron.

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A feasible strategy for realizing the Majorana fermions is searching for a simple compound with both bulk superconductivity and Dirac surface states. In this paper, we perform calculations of electronic band structure, the Fermi surface, and the surface states, and measure the resistivity, magnetization, and specific heat of a TlSb compound with a CsCl-type structure. The band structure calculations show that TlSb is a Dirac semimetal when spin-orbit coupling is considered. TlSb is first determined to be a type-II superconductor with T c =4.38 K, H c1 (0) = 148 Oe, H c2 (0)=1.12 T, and κ GL = 10.6. We also confirm that TlSb is a moderately coupled s-wave superconductor. Although we cannot determine the band near the Fermi level E F that is responsible for superconductivity, its coexistence with topological surface states implies that the TlSb compound may be a simple material platform to realize the fault-tolerant quantum computations.

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Robust Zero Energy Modes on Superconducting Bismuth Islands Deposited on Fe(Te,Se)

Cited by 9 publications

References 47 publications

Emergent vortex Majorana zero mode in iron-based superconductors

Emergent vortex Majorana zero mode in iron-based superconductors

Experimental review on Majorana zero-modes in hybrid nanowires

Bulk superconductivity in the Dirac semimetal TlSb

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