Half-metallic superconducting triplet spin multivalves

Alidoust, Mohammad; Halterman, Klaus

doi:10.1103/physrevb.97.064517

Cited by 51 publications

(43 citation statements)

References 62 publications

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“…In this case, the superconducting gap function should be solved self-consistently to extract T c , which is however, a nontrivial and formidable task that is postponed for future works. 34,35…”

Section: A Symmetry Profile Of Superconducting Pair Correlationsmentioning

confidence: 99%

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Alidoust

Halterman

2020

Phys. Rev. B

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We study the effective symmetry profiles of superconducting pair correlations and the flow of charge supercurrent in ballistic Weyl semimetal systems with a tilted dispersion relation. Utilizing a microscopic method in the ballistic regime and starting from both opposite-pseudospin and equal-pseudospin phonon-mediated oppositespin electron-electron couplings, we calculate the anomalous Green's function to study various superconducting pair correlations that Weyl semimetal systems may develop. The momentum-space profile reveals that by properly manipulating the parameters of Weyl semimetal systems, including the tilting parameter, the effective symmetry class of even-parity s-wave (odd-parity p-wave) superconducting correlations can be converted into a d-wave ( f -wave) symmetry class that consists of equal-pseudospin and opposite-pseudospin channels. We also find that the supercurrent in a ballistic Weyl Josephson junction can be made to vanish or switch directions, depending on the tilt of the Weyl cones, in addition to the relevant parameters characterizing the Weyl semimetal and junction. We show that inversion symmetry breaking terms introduce transitions that result in the appearance of self-biased current at zero difference between the macroscopic phases of the superconducting segments, creating a ϕ 0 Josephson state. Weyl semimetal systems are shown to offer several experimentally tunable parameters to control the induction of higher harmonics into the current phase relations. arXiv:1906.05382v1 [cond-mat.supr-con]

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Section: A Symmetry Profile Of Superconducting Pair Correlationsmentioning

confidence: 99%

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Alidoust

Halterman

2020

Phys. Rev. B

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“…However, despite the decades-long use of spin valves in spintronics for magnetically storing and sensing information [24], as well as advances in superconducting spin valves [25][26][27][28][29], there are no prior studies to accurately model how the resulting magnetic textures and fringing fields in realistic structures would create and control MBS. Here we establish such micromagnetic modeling to examine not just the feasibility of MBS in proximity-modified 2DEG, but also to suggest alternative methods to realize braiding in other platforms, including those relying on MBS formed in vortices [30,31].…”

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confidence: 99%

Tunable magnetic textures in spin valves: From spintronics to Majorana bound states

et al. 2019

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Spin-valve structures in which a change of magnetic configuration is responsible for magnetoresistance led to impressive advances in spintronics, focusing on magnetically storing and sensing information. However, this mature technology also offers versatile control of magnetic textures with usually neglected underlying fringing fields to enable entirely different applications by realizing topologically-nontrivial states. Together with proximity-induced superconductivity in a two-dimensional electron gas with a large g-factor, these fringing fields realized in commercially-available spin valves provide Zeeman splitting, synthetic spin-orbit coupling, and confinement, needed for Majorana bound states (MBS). Detailed support for the existence and control of MBS is obtained by combining accurate micromagnetic simulation of fringing fields used as an input in Bogoliubov de Gennes equation to calculate low-energy spectrum, wavefunction localization, and local charge neutrality. A generalized condition for a quantum phase transition in these structures provides valuable guidance for the MBS evolution and implementing reconfigurable effective topological wires.

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“…To understand feasibility of ferromangetism and superconductivity, and also the role of magnetization in F|S hybrids, many superconducting spintronic SVs had been extensively studied theoretically [76][77][78][79][80][81][82][83][84][85][86] and experimentally [87][88][89][90][91][92][93][94][95][96]. Previous works on F|S heterostructure and superconducting SVs strongly indicates that the superconducting critical temperature is dependent on the orientation of magnetization.…”

Section: Introductionmentioning

confidence: 99%

Spin transport and Spin Tunnelling Magneto-Resistance (STMR) of F|NCSC|F spin valve

Acharjee¹,

Goswami²

2020

Journal of Magnetism and Magnetic Materials

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In this work, we study the spin transport at the Ferromagnet|Noncentrosymmetric Superconductor (F|NCSC) junction of a Ferromagnet|Noncentrosymmetric Superconductor|Ferromagnet (F|NCSC|F) spin valve. We investigate the Tunnelling Spin-Conductance (TSC), spin current and Spin Tunnelling Magneto-Resistance (STMR), and their dependence on various important parameters like Rashba Spin-Orbit Coupling (RSOC), strength and orientation of magnetization, an external in-plane magnetic field, barrier strength and a significant Fermi Wavevector Mismatch (FWM) at the ferromagnetic and superconducting regions. The study has been carried out for different singlet-triplet mixing of the NCSC gap parameter. We develop Bogoliubov-de Gennes (BdG) Hamiltonian and use the extended Blonder -Tinkham -Klapwijk (BTK) approach along with the scattering matrix formalism to calculate the scattering coefficients. Our results strongly suggest that the TSC is highly dependent on RSOC, magnetization strength and its orientation, and singlet-triplet mixing of the gap parameter. It is observed that NCSC with moderate RSOC shows maximum conductance for a partially opaque barrier in presence of low external magnetic field. For a strongly opaque barrier and a nearly transparent barrier a moderate value and a low value of field respectively are found to be suitable. Moreover, NCSC with large singlet component is appeared to be useful. In addition, for NCSC with large RSOC and low magnetization strength, a giant STMR (%) is observed. We have also seen that the spin current is strongly magnetization orientation dependent. With the increase in bias voltage spin current increases in transverse direction, but the component along the direction of flow is almost independent. PACS numbers: 67.30.hj, 74.90.+n

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Half-metallic superconducting triplet spin multivalves

Cited by 51 publications

References 62 publications

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Evolution of pair correlation symmetries and supercurrent reversal in tilted Weyl semimetals

Tunable magnetic textures in spin valves: From spintronics to Majorana bound states

Spin transport and Spin Tunnelling Magneto-Resistance (STMR) of F|NCSC|F spin valve

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