Probing the magnetoelectric effect in noncentrosymmetric superconductors by equal-spin Andreev tunneling

Tkachov, G.

doi:10.1088/1361-648x/aaf337

Cited by 4 publications

(9 citation statements)

References 93 publications

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“…to treat proximiy-induced superconductivity. Furthermore, the nonunitary pairing does not generally require the spin field h. The pair spin polarisation if × f * can be induced just by an electric current via charge-spin conversion [596,627]. To illustrate this point let us consider the BdG Hamiltonian…”

Section: Nonunitary Triplet Pairing and Charge-spin Conversionmentioning

confidence: 99%

Transport in two-dimensional topological materials: recent developments in experiment and theory

et al. 2020

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We review theoretical and experimental highlights in transport in two-dimensional materials focussing on key developments over the last five years. Topological insulators are finding applications in magnetic devices, while Hall transport in doped samples and the general issue of topological protection remain controversial. In transition metal dichalcogenides valley-dependent electrical and optical phenomena continue to stimulate state-of-the-art experiments. In Weyl semimetals the properties of Fermi arcs are being actively investigated. A new field, expected to grow in the near future, focuses on the non-linear electrical and optical responses of topological materials, where fundamental questions are once more being asked about the intertwining roles of the Berry curvature and disorder scattering. In topological superconductors the quest for chiral superconductivity, Majorana fermions and topological quantum computing is continuing apace. :1907.10058v1 [cond-mat.mes-hall] arXiv

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Section: Nonunitary Triplet Pairing and Charge-spin Conversionmentioning

confidence: 99%

Transport in two-dimensional topological materials: recent developments in experiment and theory

et al. 2020

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“…4(c)]. Most important, the threshold (39) for the full spin polarization is reached at the field value B = 0.2B spin much smaller than the "spin" field in Eq. (42).…”

Section: A Cpr Preliminariesmentioning

confidence: 95%

“…The crucial difference is the value of h z which is 5 times smaller here. This becomes possible because the actual threshold (39) is lower than h z = ∆ 0 . Even for h z ≪ ∆ 0 , there is a value of k S at which the condition (39) is still met.…”

Section: A Cpr Preliminariesmentioning

confidence: 99%

“…This becomes possible because the actual threshold (39) is lower than h z = ∆ 0 . Even for h z ≪ ∆ 0 , there is a value of k S at which the condition (39) is still met. Note that proximity-induced gap |∆(k S )| does not collapse provided, of course, that the bias current remains below the critical value for the superconducting strips.…”

Section: A Cpr Preliminariesmentioning

confidence: 99%

“…Generally, in noncentrosymmetric superconductors the phase gradient induces also a non-unitary triplet order parameter. 38,39 This aspect of the problem will be discussed elsewhere.…”

Section: Introductionmentioning

confidence: 99%

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Chiral current-phase relation of topological Josephson junctions: A signature of the 4π -periodic Josephson effect

Tkachov

2019

Phys. Rev. B

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The 4π -periodic Josephson effect is an indicator of Majorana zero modes and a ground-state degeneracy which are central to topological quantum computation. However, the observability of a 4π -periodic Josephson current-phase relation (CPR) is hindered by the necessity to fix the fermionic parity. As an alternative to a 4π -periodic CPR, this paper proposes a chiral CPR for the 4π -periodic Josephson effect. This is a CPR of the form J(φ) ∝ C | sin(φ/2)|, describing a unidirectional supercurrent with the chirality C = ±1. Its non-analytic dependence on the Josephson phase difference φ translates into the 4π -periodic CPR J(φ) ∝ sin(φ/2). The proposal requires a spin-polarized topological Josephson junction which is modeled here as a short link between spinsplit superconducting channels at the edge of a two-dimensional topological insulator. In this case, C coincides with the Chern number of the occupied spin band of the topological insulator. The paper details three scenarios of achieving a chiral CPR: by Zeeman-like splitting only, by Zeeman splitting combined with bias currents, and by an external out-of-plane magnetic field.

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Spin–orbit effects in pentavalent iridates: models and materials

Bhowal¹,

Dasgupta²

2021

J. Phys.: Condens. Matter

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Spin-orbit effects in heavy 5d transition metal oxides, in particular, iridates, have received enormous current interest due to the prediction as well as the realization of a plethora of exotic and unconventional magnetic properties. While a bulk of these works are based on tetravalent iridates (d 5 ), where the counter-intuitive insulating state of the rather extended 5d orbitals are explained by invoking strong spin-orbit coupling, the recent quest in iridate research has shifted to the other valencies of Ir, of which pentavalent iridates constitute a notable representative. In contrast to the tetravalent iridates, spin-orbit entangled electrons in d 4 systems are expected to be confined to the J = 0 singlet state without any resultant moment or magnetic response. However, it has been recently predicted that, magnetism in d 4 systems may occur via magnetic condensation of excitations across spin-orbit-coupled states. In reality, the magnetism in Ir 5+ systems are often quite debatable both from theoretical as well as experimental point of view. Here we provide a comprehensive overview of the spin-orbit coupled d 4 model systems and its implications in the studied pentavalent iridates. In particular, we review here the current experimental and theoretical understanding of the double perovskite (A 2 BYIrO 6 , A = Sr, Ba, B = Y, Sc, Gd), 6H-perovskite (Ba 3 MIr 2 O 9 , M = Zn, Mg, Sr, Ca), post-perovskite (NaIrO 3 ), and hexagonal (Sr 3 MIrO 6 ) iridates, along with a number of open questions that require future investigation.

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Probing the magnetoelectric effect in noncentrosymmetric superconductors by equal-spin Andreev tunneling

Cited by 4 publications

References 93 publications

Transport in two-dimensional topological materials: recent developments in experiment and theory

Transport in two-dimensional topological materials: recent developments in experiment and theory

Chiral current-phase relation of topological Josephson junctions: A signature of the 4π -periodic Josephson effect

Spin–orbit effects in pentavalent iridates: models and materials

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