194 citations · 989 across the 38 of their papers we have counts for
38 papers
Flux-tunable global and local superconductivity in a topological insulator nano-SQUID
Ella Nikodem, Jakob Schluck, Michał Papaj +5
Topological systems are defined by global properties that enforce the existence of local boundary modes. Three-dimensional topological insulators (TIs) were among the earliest prop…
Probing Fermi-surface spin-textures via the nonlinear Shubnikov-de Haas effect
Kazuki Nakazawa, Henry F. Legg, Renato M. A. Dantas +2
The coupling of spin and electronic degrees of freedom via the spin-orbit interaction (SOI) is an essential ingredient for many proposed future technologies. However, probing the s…
Reply to the Comment by Tikhonov and Khrapai on "Long-range crossed Andreev reflection in a topological insulator nanowire proximitized by a superconductor"
Junya Feng, Henry F. Legg, Mahasweta Bagchi +3
The comment (arXiv:2505.23490) fails to identify any scientific errors and its central arguments actually support the main conclusions of our publication [Nat. Phys. 21, 708 (2025)…
Anomalous Josephson effect in hybrid superconductor-hole systems
Peter D. Johannsen, Henry F. Legg, Stefano Bosco +2
We consider hybrid systems consisting of a hole-doped semiconductor coupled to electronic states of finite-size superconductors, where the opposite sign of the masses in the two su…
Properties and prevalence of false poor man's Majoranas in two- and three-site artificial Kitaev chains
Melina Luethi, Henry F. Legg, Daniel Loss +1
It was predicted that a minimal chain of two quantum dots (QDs) connected via a superconductor can host perfectly localized zero-energy states, known as poor man's Majoranas (PMMs)…
Comment on "Interferometric single-shot parity measurement in InAs-Al hybrid devices", Microsoft Quantum, Nature 638, 651-655 (2025)
Henry F. Legg
We consider the 'parity readout' of a (topological) superconductor claimed in Nature 638, 651-655 (2025). A prerequisite for this claim is the existence of a superconducting gap in…
Comment on "InAs-Al hybrid devices passing the topological gap protocol", Microsoft Quantum, Phys. Rev. B 107, 245423 (2023)
Henry F. Legg
The topological gap protocol (TGP) is presented as "a series of stringent experimental tests" for the presence of topological superconductivity and associated Majorana zero modes.…
Tunable superconducting diode effect in a topological nano-SQUID
Ella Nikodem, Jakob Schluck, Max Geier +6
A Josephson diode passes current with zero resistance in one direction but is resistive in the other direction. While such an effect has been observed in several platforms, a large…
Topological Insulator nano-SQUID: Flux-tunable platform for topological superconductivity
Ella Nikodem, Jakob Schluck, Henry F. Legg +5
Many efforts have been made in the past decade to realize topological superconductivity using superconducting proximity effect, but an ideal platform is still lacking. A 3D topolog…
Interband contributions to nonlinear transport in semiconductor nanostructures
Kazuki Nakazawa, Henry F. Legg, Jelena Klinovaja +1
Spin-orbit interaction (SOI) is a crucial ingredient for many potential applications of quantum devices, such as the use of semiconductor nanostructures for quantum computing. It i…
Fate of poor man's Majoranas in the long Kitaev chain limit
Melina Luethi, Henry F. Legg, Daniel Loss +1
A minimal Kitaev chain, consisting of two quantum dots connected via a superconductor, can host highly localized near-zero-energy states, known as poor man's Majoranas (PMMs). Thes…
From perfect to imperfect poor man's Majoranas in minimal Kitaev chains
Melina Luethi, Henry F. Legg, Daniel Loss +1
Poor man's Majoranas (PMMs) hold the promise to engineer Majorana bound states in a highly tunable setup consisting of a chain of quantum dots that are connected via superconductor…
Long-range crossed Andreev reflection in topological insulator nanowires proximitized by a superconductor
Junya Feng, Henry F. Legg, Mahasweta Bagchi +3
Crossed Andreev reflection (CAR) is a nonlocal transport phenomenon that creates/detects Cooper-pair correlations between distant places. It is also the basis of Cooper-pair splitt…
Relations between normal state nonreciprocal transport and the superconducting diode effect in the trivial and topological phases
Georg Angehrn, Henry F. Legg, Daniel Loss +1
Nonreciprocal transport effects can occur in the normal state of conductors and in superconductors when both inversion and time-reversal symmetry are broken. Here, we consider syst…
Josephson transistor from the superconducting diode effect in domain wall and skyrmion magnetic racetracks
Richard Hess, Henry F. Legg, Daniel Loss +1
In superconductors, the combination of broken time-reversal and broken inversion symmetries can result in a critical current being dependent on the direction of current flow. This…
Reply to Antipov et al., Microsoft Quantum: "Comment on Hess et al. Phys. Rev. Lett. 130, 207001 (2023)"
Henry F. Legg, Richard Hess, Daniel Loss +1
In this Reply we respond to the comment by Antipov et al. from Microsoft Quantum on Hess et al., PRL 130, 207001 (2023). Antipov et al. reported only a single simulation and claime…
Induced superconducting correlations in the quantum anomalous Hall insulator
Anjana Uday, Gertjan Lippertz, Kristof Moors +5
Inducing Cooper pairing in a thin ferromagnetic topological insulator in the quantum anomalous Hall state (called quantum anomalous Hall insulator, QAHI) is a promising way to real…
Reply to "Comment on 'Trivial Andreev Band Mimicking Topological Bulk Gap Reopening in the Nonlocal Conductance of Long Rashba Nanowires'"
Richard Hess, Henry F. Legg, Daniel Loss +1
In this Reply we respond to the comment by Das Sarma and Pan [1] on Hess et al., Phys. Rev. Lett. 130, 207001, "Trivial Andreev Band Mimicking Topological Bulk Gap Reopening in the…
Microscopic analysis of proximity-induced superconductivity and metallization effects in superconductor-germanium hole nanowires
Christoph Adelsberger, Henry F. Legg, Daniel Loss +1
Low-dimensional germanium hole devices are promising systems with many potential applications such as hole spin qubits, Andreev spin qubits, and Josephson junctions, and can serve…
Majorana bound states in germanium Josephson junctions via phase control
Melina Luethi, Henry F. Legg, Katharina Laubscher +2
We consider superconductor-normal-superconductor-normal-superconductor (SNSNS) planar Josephson junctions in hole systems with spin-orbit interaction that is cubic in momentum (CSO…
Topological insulator spin transistor
Linh T. Dang, Oliver Breunig, Zhiwei Wang +2
When a charge current is injected into the surface state of a topological insulator (TI), the resulting shift of the spin-momentum-locked Fermi surface leads to the appearance of a…
Top-down fabrication of bulk-insulating topological insulator nanowires for quantum devices
Matthias Rößler, Dingxun Fan, Felix Münning +8
In a nanowire (NW) of a three-dimensional topological insulator (TI), the quantum-confinement of topological surface states leads to a peculiar subband structure that is useful for…
Parity protected superconducting diode effect in topological Josephson junctions
Henry F. Legg, Katharina Laubscher, Daniel Loss +1
In bulk superconductors or Josephson junctions formed in materials with spin-orbit interaction, the critical current can depend on the direction of current flow and applied magneti…
Trivial Andreev band mimicking topological bulk gap reopening in the non-local conductance of long Rashba nanowires
Richard Hess, Henry F. Legg, Daniel Loss +1
We consider a one-dimensional Rashba nanowire in which multiple Andreev bound states in the bulk of the nanowire form an Andreev band. We show that, under certain circumstances, th…