Local and nonlocal quantum transport due to Andreev bound states in finite Rashba nanowires with superconducting and normal sections

Hess, Richard; Legg, Henry F.; Loss, Daniel; Klinovaja, Jelena

doi:10.1103/physrevb.104.075405

Cited by 56 publications

(30 citation statements)

References 88 publications

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“…Within this picture, Majorana zero-modes appear as zero-bias peaks only in local conductance, not in nonlocal conductance because of their localized probability density. This is in contrast to extended Andreev bound states, which are expected to appear in both local and nonlocal conductances [21,23].…”

mentioning

confidence: 78%

“…An emerging method that allows simultaneous observation of end modes and bulk gap behavior is nonlocal spectroscopy, where measurement of the tunneling current between the ends of a device provides information about the bulk [18]. This technique requires a threeterminal (3T) configuration, and has been theoretically explored for nanowires [18][19][20][21][22]. Nonlocal transport experiments, also in nanowires, were used to probe symmetries of the conductance matrix arising from current conservation and measure the local charge of Andreev bound states [20,23].…”

mentioning

confidence: 99%

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Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions

Banerjee¹,

Lesser²,

Rahman³

et al. 2022

Preprint

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We report simultaneously acquired local and nonlocal transport spectroscopy in a phase-biased planar Josephson junction based on an epitaxial InAs/Al hybrid two-dimensional heterostructure. Quantum point contacts at the junction ends allow measurement of the 2×2 matrix of local and nonlocal tunneling conductances as a function of magnetic field along the junction, phase difference across the junction, and carrier density. A closing and reopening of a gap was observed in both the local and nonlocal tunneling spectra as a function of magnetic field. For particular tunings of junction density, gap reopenings were accompanied by zero-bias conductance peaks (ZBCPs) in local conductances. End-to-end correlation of gap reopening was strong, while correlation of local ZBCPs was weak. A simple, disorder-free model of the device shows comparable conductance matrix behavior associated with a topological phase transition. Phase dependence helps distinguish possible origins of the ZBCPs.

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mentioning

confidence: 78%

mentioning

confidence: 99%

Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions

Banerjee¹,

Lesser²,

Rahman³

et al. 2022

Preprint

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“…As pointed out in a different context by recent theoretical and experimental works, [46][47][48][49][50][51][52][53][54] this feature raises concerns that either of these two zero-energy states (trivial and nontrivial) may be mistakenly identified as a Majorana mode.…”

Section: B Ph Symmetry: Kitaev/nm Junctionmentioning

confidence: 91%

Proximity-induced zero-energy states indistinguishable from topological edge states

Califrer¹,

Penteado²,

Egues³

et al. 2022

Preprint

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“…For applied voltages smaller than the superconducting gap, nonlocal transport is mediated by Andreev states that couple to the relevant tunnel probes. Theoretical studies predict a characteristic signature in nonlocal conductance of a topological phase transition in NWs with particular spin-orbit and Zeeman effect [6][7][8][9]. Characteristic symmetry relations relating local and nonlocal conductances have been reported experimentally [4].…”

mentioning

confidence: 90%

Nonlocal conductance spectroscopy of Andreev bound states in gate-defined InAs/Al nanowires

Pöschl¹,

Danilenko²,

Sabonis³

et al. 2022

Preprint

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The charge character of Andreev bound states (ABSs) in a three-terminal semiconductorsuperconductor hybrid nanowire was measured using local and nonlocal tunneling spectroscopy. The device is fabricated using an epitaxial InAs/Al two-dimensional heterostructure with several gate-defined side probes. ABSs are found to oscillate around zero as a function of gate voltage, with modifications of their charge consistent with theoretical expectations for the total Bardeen-Cooper-Schrieffer (BCS) charge of ABSs.

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Local and nonlocal quantum transport due to Andreev bound states in finite Rashba nanowires with superconducting and normal sections

Cited by 56 publications

References 88 publications

Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions

Local and Nonlocal Transport Spectroscopy in Planar Josephson Junctions

Proximity-induced zero-energy states indistinguishable from topological edge states

Nonlocal conductance spectroscopy of Andreev bound states in gate-defined InAs/Al nanowires

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