Majorana bound states in two-channel time-reversal-symmetric nanowire systems
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Majorana bound states in two-channel time-reversal-symmetric nanowire systems. / Gaidamauskas, Erikas; Paaske, Jens; Flensberg, Karsten.
In: Physical Review Letters, Vol. 112, No. 12, 126402, 25.03.2014.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Majorana bound states in two-channel time-reversal-symmetric nanowire systems
AU - Gaidamauskas, Erikas
AU - Paaske, Jens
AU - Flensberg, Karsten
PY - 2014/3/25
Y1 - 2014/3/25
N2 - We consider time-reversal-symmetric two-channel semiconducting quantum wires proximity coupled to a conventional s-wave superconductor. We analyze the requirements for a non-trivial topological phase, and find that 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. 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.
AB - We consider time-reversal-symmetric two-channel semiconducting quantum wires proximity coupled to a conventional s-wave superconductor. We analyze the requirements for a non-trivial topological phase, and find that 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. 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.
KW - cond-mat.mes-hall
KW - cond-mat.supr-con
U2 - 10.1103/PhysRevLett.112.126402
DO - 10.1103/PhysRevLett.112.126402
M3 - Journal article
VL - 112
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 12
M1 - 126402
ER -
ID: 50797558