Detecting a Majorana-Fermion Zero Mode Using a Quantum Dot

Details Detecting a Majorana-Fermion Zero Mode Using a Quantum Dot Detecting a Majorana-Fermion Zero Mode Using a Quantum Dot

2011-07-21

arxiv.org/abs/1107.4338v2

Phys. Rev. B 84, 201308(R) (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.201308

We propose an experimental setup for detecting a Majorana zero mode consisting of a spinless quantum dot coupled to the end of a p-wave superconducting nanowire. The Majorana bound state at the end of the wire strongly influences the conductance through the quantum dot: Driving the wire through the topological phase transition causes a sharp jump in the conductance by a factor of 1/2. In the topological phase, the zero temperature peak value of the dot conductance (i.e. when the dot is on resonance and symmetrically coupled to the leads) is e^2/2h. In contrast, if the wire is in its trivial phase, the conductance peak value is e^2/h, or if a regular fermionic zero mode occurs on the end of the wire, the conductance is 0. The system can also be used to tune Flensberg's qubit system [PRL 106, 090503 (2011)] to the required degeneracy point.

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