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- W2127454928 abstract "We consider time-reversal-symmetric two-channel semiconducting quantum wires proximity coupled to a conventional $s$-wave superconductor. We analyze the requirements for a nontrivial topological phase and find that the necessary conditions are (1) the determinant of the pairing matrix in channel space must be negative, (2) inversion symmetry must be broken, and (3) the two channels must have different spin-orbit couplings. The first condition can be implemented in semiconducting nanowire systems where interactions suppress intra-channel pairing, while the inversion symmetry can be broken by tuning the chemical potentials of the channels. For the case of collinear spin-orbit directions, we find a general expression for the topological invariant by block diagonalization into two blocks with chiral symmetry only. By projection to the low-energy sector, we solve for the zero modes explicitly and study the details of the gap closing, which in the general case happens at finite momenta." @default.
- W2127454928 created "2016-06-24" @default.
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- W2127454928 date "2014-03-25" @default.
- W2127454928 modified "2023-09-25" @default.
- W2127454928 title "Majorana Bound States in Two-Channel Time-Reversal-Symmetric Nanowire Systems" @default.
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- W2127454928 doi "https://doi.org/10.1103/physrevlett.112.126402" @default.
- W2127454928 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24724665" @default.
- W2127454928 hasPublicationYear "2014" @default.
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