Anomalous Zero-Bias Conductance Peak in a Nb–InSb Nanowire–Nb Hybrid Device

Deng, Mingtang; Yu, Chuang; Huang, Guang-Yao; Larsson, Marcus; Caroff, Philippe; Xu, Hongqi

doi:10.1021/nl303758w

Cited by 1,667 publications

(1,793 citation statements)

References 35 publications

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“…Recently, there has been a tremendous effort in designing and realizing materials platforms where topological superconductivity and MFs can be successfully obtained. This is demonstrated by the proposal of a large variety of systems based on heterostructures made of topological insulators or semiconductors interfaced with s-wave superconductors (SCs) [6][7][8][9][10] as well as by the subsequent experimental evidence of MFs in hybrid superconducting devices [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Magnetic manipulation of topological states in p-wave superconductors

Mercaldo

Cuoco

Kotetes

2018

Physica B: Condensed Matter

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Substantial experimental investigation has provided evidence for spin-triplet pairing in diverse classes of materials and in a variety of artificial heterostructures. A fundamental challenge in actual experiments is how to manipulate the topological behavior of p-wave superconductors (PSCs) that could open perspectives for applications. Such a control knob is naturally provided by the spintriplet character of the PSC order parameter, described by the spin d-vector. Therefore, in this work we investigate the magnetic field response of one-dimensional (1d) PSCs and demonstrate that the structure of the Cooper pair spin-configuration is crucial to set topological phases with an enhanced number of Majorana fermions per edge, N , ranging from N = 0 to 4. The topological phase diagram, consisting of phases with Majorana modes at the edge, becomes significantly modified when one tunes the strength of the applied field and allows for long range hopping amplitudes in the 1d PSC. We find transitions between phases with different number of Majorana fermions per edge that can be both induced by a variation of the hopping strength and a spin rotation of d. Hence, the interplay of the applied magnetic field and the internal spin degree of freedom of the PSC opens a new promising route for engineering topological phases with large number of Majorana modes.

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Section: Introductionmentioning

confidence: 99%

Magnetic manipulation of topological states in p-wave superconductors

Mercaldo

Cuoco

Kotetes

2018

Physica B: Condensed Matter

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“…These III-V semiconductor nanowires, especially those with narrow band gaps, have also been used to construct hybrid quantum structures for the study of novel physics phenomena such as Majorana bound states in topological superconducting systems. [16][17][18][19] III-V semiconductor nanowires were successfully prepared by chemical vapor deposition (CVD). 20,21 In recent years, sophisticated but complex techniques, including metal-organic vapor phase epitaxy (MOVPE) and molecular beam epitaxy (MBE) have been extensively used to grow III-V semiconductor nanowires.…”

Section: Introductionmentioning

confidence: 99%

Generic technique to grow III-V semiconductor nanowires in a closed glass vessel

Xing

2016

AIP Advances

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Crystalline III-V semiconductor nanowires have great potential in fabrication of nanodevices for applications in nanoelectronics and optoelectronics, and for studies of novel physical phenomena. Sophisticated epitaxy techniques with precisely controlled growth conditions are often used to prepare high quality III-V nanowires. The growth process and cost of these experiments are therefore dedicated and very high. Here, we report a simple but generic method to synthesize III-V nanowires with high crystal quality. The technique employs a closed evacuated tube vessel with a small tube carrier containing a solid source of materials and another small tube carrier containing a growth substrate inside. The growth of nanowires is achieved after heating the closed vessel in a furnace to a preset high temperature and then cooling it down naturally to room temperature. The technique has been employed to grow InAs, GaAs, and GaSb nanowires on Si/SiO2 substrates. The as-grown nanowires are analyzed by SEM, TEM and Raman spectroscopy and the results show that the nanowires are high quality zincblende single crystals. No particular condition needs to be adjusted and controlled in the experiments. This technique provides a convenient way of synthesis of III-V semiconductor nanowires with high material quality for a wide range of applications.

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“…While it becomes clear theoretically that MBSs appear at vortex cores in two-dimensional (2D) topological SCs and ends of 1D ones realized in various hybrid systems [14][15][16][17][18][19][20][21][22][23], to nail them down conclusively in experiments remains challenging [10,[24][25][26].…”

mentioning

confidence: 99%

Helical Spin Texture and Interference of Majorana Bound States in One-Dimensional Topological Superconductor

Kawakami

2016

J. Phys. Soc. Jpn.

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We investigate one-dimensional (1D) Majorana bound states (MBSs) realized in terms of the helical edge states of a 2D quantum spin-Hall insulator (QSHI) in a heterostructure with a superconducting substrate and two ferromagnetic insulators (FIs). By means of Bogoliubov-de Gennes approach we demonstrate that there is a helical spin texture in the MBS wave function with a pitch proportional to the Fermi momentum of the helical edge states of QSHI . Moreover, simultaneous detection on local density of states by scanning tunneling microscopy and spectroscopy at a position close to one FI edge and at the midpoint between two FIs can not only map out the energy spectrum ±E cos(φ/2), but also prove experimentally that the two quasiparticle excitations do not mix with each other as protected by the parity conservation associated with the MBSs.Introduction.-Considerable efforts have been devoted to search for peculiar zero-energy quasiparticle excitations in topological superconductors (SCs) [1][2][3][4], which, getting name of Majorana bound states (MBSs) due to the equivalence to their antiparticles [5,6], can realize non-Abelian quantum statistics useful for establishing decoherence-free topological quantum computation [7][8][9][10][11][12][13]. While it becomes clear theoretically that MBSs appear at vortex cores in two-dimensional (2D) topological SCs and ends of 1D ones realized in various hybrid systems [14][15][16][17][18][19][20][21][22][23], to nail them down conclusively in experiments remains challenging [10,[24][25][26].Recently experimental works have been reported on local density of states (LDOS) associated with MBSs explored by scanning tunneling microscopy and spectroscopy (STM/STS). In a system of iron (Fe) chains on the lead (Pb) substrate, high-resolution spectroscopic images signal zero-energy quasiparticle states localized at the ends of Fe chains, as expected with the emergence of MBSs [27]. In a hybrid device made of a NbSe 2 substrate and a thin film of 3D topological insulator (TI) Bi 2 Te 3 , LDOS at vortex cores as a function of energy and the distance from vortex center evolves from "V"-shape to "Y"-shape with increasing thickness of the TI film, reflecting the appearance of MBSs [28]. By means of Bogoliubov-de Gennes (BdG) approach the present authors confirmed this LDOS evolution, and meanwhile revealed a "checkerboard" pattern in the relative LDOS between spin up and down channels inside vortex cores. The latter property can be explored experimentally by spin-resolved STM/STS, which may identify MBSs as individual quantum states [29].The spin oscillations in MBS wave function in a vortex core are governed by the conservation of total angular momentum, which has contributions from orbital and spin angular momenta as well as the phase winding of superconducting vortex. It is then interesting to ask whether a spin texture exists in 1D MBS where orbital angular momentum and superconducting phase

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Anomalous Zero-Bias Conductance Peak in a Nb–InSb Nanowire–Nb Hybrid Device

Cited by 1,667 publications

References 35 publications

Magnetic manipulation of topological states in p-wave superconductors

Magnetic manipulation of topological states in p-wave superconductors

Generic technique to grow III-V semiconductor nanowires in a closed glass vessel

Helical Spin Texture and Interference of Majorana Bound States in One-Dimensional Topological Superconductor

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