TY - JOUR

T1 - Electrical transport through a quantum dot side-coupled to a topological superconductor

AU - Lee, Yu Li

PY - 2014/11/12

Y1 - 2014/11/12

N2 - We propose to measure the differential conductance G as a function of the bias V for a quantum dot side-coupled to a topological superconductor to detect the existence of the chiral Majorana edge states. It turns out that G for the spinless dot is an oscillatory (but not periodic) function of eV due to the coupling to the chiral Majorana edge states, where -e is the charge carried by the electron. The behaviour of G versus eV is distinguished from that of a multi-level dot in three respects. First of all, due to the coupling to the topological superconductor, the value of G will shift upon adding or removing a vortex in the topological superconductor. Next, for an off-resonance dot, the conductance peak in the present case takes a universal value e2/(2h) when the two leads are symmetrically coupled to the dot. Finally, for a symmetric setup and an on-resonance dot, the conductance peak will approach the same universal value e2/(2h) at a large bias.

AB - We propose to measure the differential conductance G as a function of the bias V for a quantum dot side-coupled to a topological superconductor to detect the existence of the chiral Majorana edge states. It turns out that G for the spinless dot is an oscillatory (but not periodic) function of eV due to the coupling to the chiral Majorana edge states, where -e is the charge carried by the electron. The behaviour of G versus eV is distinguished from that of a multi-level dot in three respects. First of all, due to the coupling to the topological superconductor, the value of G will shift upon adding or removing a vortex in the topological superconductor. Next, for an off-resonance dot, the conductance peak in the present case takes a universal value e2/(2h) when the two leads are symmetrically coupled to the dot. Finally, for a symmetric setup and an on-resonance dot, the conductance peak will approach the same universal value e2/(2h) at a large bias.

UR - http://www.scopus.com/inward/record.url?scp=84908266977&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84908266977&partnerID=8YFLogxK

U2 - 10.1088/0953-8984/26/45/455702

DO - 10.1088/0953-8984/26/45/455702

M3 - Article

AN - SCOPUS:84908266977

VL - 26

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 45

M1 - 455702

ER -