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Title: Weyl nodes in Andreev spectra of multiterminal Josephson junctions: Chern numbers, conductances, and supercurrents

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1418880
Grant/Contract Number:
SC0017888
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 3; Related Information: CHORUS Timestamp: 2018-01-31 10:45:40; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Xie, Hong-Yi, Vavilov, Maxim G., and Levchenko, Alex. Weyl nodes in Andreev spectra of multiterminal Josephson junctions: Chern numbers, conductances, and supercurrents. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.035443.
Xie, Hong-Yi, Vavilov, Maxim G., & Levchenko, Alex. Weyl nodes in Andreev spectra of multiterminal Josephson junctions: Chern numbers, conductances, and supercurrents. United States. doi:10.1103/PhysRevB.97.035443.
Xie, Hong-Yi, Vavilov, Maxim G., and Levchenko, Alex. 2018. "Weyl nodes in Andreev spectra of multiterminal Josephson junctions: Chern numbers, conductances, and supercurrents". United States. doi:10.1103/PhysRevB.97.035443.
@article{osti_1418880,
title = {Weyl nodes in Andreev spectra of multiterminal Josephson junctions: Chern numbers, conductances, and supercurrents},
author = {Xie, Hong-Yi and Vavilov, Maxim G. and Levchenko, Alex},
abstractNote = {},
doi = {10.1103/PhysRevB.97.035443},
journal = {Physical Review B},
number = 3,
volume = 97,
place = {United States},
year = 2018,
month = 1
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 31, 2019
Publisher's Accepted Manuscript

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  • Oscillation have been observed in the temperature dependence of the Josephson critical supercurrent of lead-zinc-lead (SNS) junctions. These oscillations occur only in the presence of a magnetic field and the period decreases as the temperature approaches T/sub c/. Model calculations indicate that this phenomenon is related to changes in the Fraunhofer diffraction pattern with temperature.
  • Large dc supercurrents at nonzero voltages are observed in dc current-biased small Josephson tunnel junctions of the type PbIn- (PbIn)/sub x/O/sub y/-Pb with critical current densities j/sub 0/ ranging from 2 x 10/sup 2/ to 2 x 10/sup 5/ A/cm/sup 2/. The dependence of the hysteresis on j/sub 0/ and the form of the subharmonic energy gap structure are compared with the theoretical results of McDonald et al. (AIP)
  • Using a spin-parameterized quasiclassical Keldysh-Usadel technique, we theoretically study supercurrent transport in several types of diffusive ferromagnetic (F)/superconducting (S) configurations with differing magnetization textures. We separate out the even- and odd-frequency components of the supercurrent within the low proximity limit and identify the relative contributions from the singlet and triplet channels. We first consider inhomogeneous one-dimensional Josephson structures consisting of a uniform bilayer magnetic S/F/F/S structure and a trilayer S/F/F/F/S configuration, in which case the outer F layers can have either a uniform or conical texture relative to the central uniform F layer. Our results demonstrate that for supercurrents flowingmore » perpendicular to the F/F interfaces, incorporating a conical texture yields the most effective way to observe the signatures of long-ranged spin-triplet supercurrents. We also consider three different types of finite-sized two-dimensional magnetic structures subjected to an applied magnetic field normal to the junction plane: a S/F/S junction with uniform magnetization texture and two S/F/F/S configurations with differing F/F bilayer arrangements. In one case, the F/F interface is parallel with the S/F junction interfaces while in the other case, the F/F junction is oriented perpendicular to the S/F interfaces. We then discuss the proximity vortices and corresponding spatial maps of currents inside the junctions. For the uniform S/F/S junction, we analytically calculate the magnetic field induced supercurrent and pair potential in both the narrow and wide junction regimes, thus providing insight into the variations in the Fraunhofer diffraction patterns and proximity vortices when transitioning from a wide junction to a narrow one. Our extensive computations demonstrate that the induced long-range spin-triplet supercurrents can deeply penetrate uniform F/F bilayers when spin-singlet supercurrents flow parallel to the F/F interfaces. This is in stark contrast to configurations where a spin-singlet supercurrent flows perpendicular to the F/F interfaces. We pinpoint the origin of the induced triplet and singlet correlations through spatial profiles of the decomposed total supercurrents. We find that the penetration of the long-range spin-triplet supercurrents associated with supercurrents flowing parallel to the F/F interfaces is more pronounced when the thicknesses of the F strips are unequal. Finally, if one of the S terminals is replaced with a finite-sized normal metal, we demonstrate that the corresponding experimentally accessible S/F/F/N spin valve presents an effective platform in which the predicted long-range effects can be effectively generated and probed.« less
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