Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-05-17
Phys. Rev. Lett. 108, 177001 (2012)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 3 figures, accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.108.177001
Majorana fermions were envisioned by E. Majorana in 1935 to describe neutrinos. Recently it has been shown that they can be realized even in a class of electron-doped semiconductors, on which ordinary s-wave superconductivity is proximity induced, provided the time reversal symmetry is broken by an external Zeeman field above a threshold. Here we show that in a hole-doped semiconductor nanowire the threshold Zeeman field for Majorana fermions can be very small for some magic values of the hole density. In contrast to the electron-doped systems, smaller Zeeman fields and much stronger spin-orbit coupling and effective mass of holes allow the hole-doped systems to support Majorana fermions in a parameter regime which is routinely realized in current experiments.
Dumitrescu E.
Gong Ming
Mao Li
Tewari Sumanta
Zhang Chuanwei
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