Superconducting quantum spin Hall systems with giant orbital<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>g</mml:mi></mml:math>factors

Reinthaler, R. W.; Tkachov, G.; Hankiewicz, E. M.

doi:10.1103/physrevb.92.161303

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…From the dI/dV curves we have Δ ≈ 0.5 meV and 𝜇 = 360 meV, so Δ 𝜇 ≈ 1.4 ⋅ 10 −3 , so the gapless superconducting state arises when the energy scale associated with the momentum shift is of the order of the superconducting gap as expected. Such phenomenon was also proposed as a source of enhanced g-factor in quantum spin Hall insulators (29).…”

Section: Vector Potential Near the Surface Of A Superconductormentioning

confidence: 92%

Discovery of segmented Fermi surface induced by Cooper pair momentum

Zhu

Papaj

Nie

et al. 2021

Science

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A sufficiently large supercurrent can close the energy gap in a superconductor and create gapless quasiparticles through the Doppler shift of quasiparticle energy caused by finite Cooper pair momentum. In this gapless superconducting state, zero-energy quasiparticles reside on a segment of the normal state Fermi surface, whereas the remaining Fermi surface is still gapped. Here we use quasiparticle interference to image the field-controlled Fermi surface of Bi2Te3 thin films proximitized by the superconductor NbSe2. A small applied in-plane magnetic field induces a screening supercurrent, which leads to finite-momentum pairing on the topological surface states of Bi2Te3. We identify distinct interference patterns that indicate a gapless superconducting state with segmented Fermi surface. Our results reveal the strong impact of finite Cooper pair momentum on the quasiparticle spectrum.

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Section: Vector Potential Near the Surface Of A Superconductormentioning

confidence: 92%

Discovery of segmented Fermi surface induced by Cooper pair momentum

Zhu

Papaj

Nie

et al. 2021

Science

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show abstract

“…which functions as an in-plane Zeeman effect and causes the Doppler shift in the x-direction at the top-bottom surfaces as [63,64]…”

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confidence: 99%

Meissner effect induced Majorana zero modes at small magnetic field

Pan¹,

Chen²,

Liu³

et al. 2023

Preprint

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One fundamental difficulty in realizing Majorana zero modes (MZMs) is the required high magnetic field, which causes serious issues, e.g., shrinks the superconducting gap, reduces topological region, and weakens their robustness against disorder. In this work, we propose that the Meissner effect can bring the topological superconducting phase to a superconductor/topologicalinsulator/superconductor (SC/TI/SC) hybrid system. Remarkably, the required magnetic field strength (<10 mT) to support MZMs has been reduced by several orders of magnitude compared to that (>0.5 T) in the previous schemes. Tuning the phase difference between the top and bottom superconductors can control the number and position of the MZMs. In addition, we account for the electrostatic potential in the superconductor/topological-insulator (SC/TI) interface through the self-consistent Schrödinger-Poisson calculation, which shows the experimental accessibility of our proposal. Our proposal only needs a small magnetic eld of less than 10 mT and is robust against the chemical potential fluctuation, which makes SC/TI/SC hybrid an ideal Majorana platform.

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Superconducting proximity effect in three-dimensional topological insulators in the presence of a magnetic field

Burset

Tkachov

et al. 2015

Phys. Rev. B

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The proximity induced pair potential in a topological insulator-superconductor hybrid features an interesting superposition of a conventional spin-singlet component from the superconductor and a spin-triplet one induced by the surface state of the topological insulator. This singlet-triplet superposition can be altered by the presence of a magnetic field. We study the interplay between topological order and superconducting correlations performing a symmetry analysis of the induced pair potential, using Green functions techniques to theoretically describe ballistic junctions between superconductors and topological insulators under magnetic fields. We relate a change in the conductance from a gapped profile into one with a zero-energy peak with the transition into a topologically nontrivial regime where the odd-frequency triplet pairing becomes the dominant component in the pair potential. The nontrivial regime, which provides a signature of odd-frequency triplet superconductivity, is reached for an out-of-plane effective magnetization with strength comparable to the chemical potential of the superconductor or for an in-plane one, parallel to the normal-superconductor interface, with strength of the order of the superconducting gap. Strikingly, in the latter case, a misalignment with the interface yields an asymmetry with the energy in the conductance unless the total contribution of the topological surface state is considered.

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Superconducting quantum spin Hall systems with giant orbitalgfactors

Cited by 6 publications

References 27 publications

Discovery of segmented Fermi surface induced by Cooper pair momentum

Discovery of segmented Fermi surface induced by Cooper pair momentum

Meissner effect induced Majorana zero modes at small magnetic field

Superconducting proximity effect in three-dimensional topological insulators in the presence of a magnetic field

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