Journal
PHYSICAL REVIEW LETTERS
Volume 109, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.227005
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- Deutsche Forschungsgemeinschaft [SFB/TR12]
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Proximity coupled spin-orbit quantum wires purportedly support midgap Majorana states at critical points. We show that, in the presence of disorder, these systems generate a second band center anomaly, which is of different physical origin but shares key characteristics with the Majorana state: it is narrow in width, insensitive to magnetic fields, carries unit spectral weight, and is rigidly tied to the band center. Depending on the parity of the number of subgap quasiparticle states, a Majorana mode does or does not coexist with the impurity peak. The strong entanglement'' between the two phenomena may hinder an unambiguous detection of the Majorana by spectroscopic techniques.
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