We study time-resolved charge transport in a superconducting nanowire using time-dependent Landauer-Buttiker theory. We find that the steady-state Majorana zero-bias conductance peak emerges transiently accompanied by characteristic oscillations after a bias-voltage quench. These oscillations are suppressed for trivial impurity states (IS) that otherwise show a similar steady-state signal as the Majorana zero mode (MZM). In addition, we find that Andreev bound states or quasi-Majorana states (QMS) in the topologically trivial bulk phase can give rise to a zero-bias conductance peak, also retaining the transient properties of the MZM. Our results imply that (1) time-resolved transport may be used as a probe to distinguish between the topological MZM and trivial IS; and (2) the QMS mimic the transient signatures of the topological MZMs.
Tuovinen, R., and Perfetto, E., and van Leeuwen, R., Stefanucci, G., and Sentef, M. (2019). Distinguishing Majorana zero modes from impurity states through time-resolved transport. NEW JOURNAL OF PHYSICS, 21 [10.1088/1367-2630/ab4ab7].
Distinguishing Majorana zero modes from impurity states through time-resolved transport
and Perfetto E;Stefanucci G;
2019-01-01
Abstract
We study time-resolved charge transport in a superconducting nanowire using time-dependent Landauer-Buttiker theory. We find that the steady-state Majorana zero-bias conductance peak emerges transiently accompanied by characteristic oscillations after a bias-voltage quench. These oscillations are suppressed for trivial impurity states (IS) that otherwise show a similar steady-state signal as the Majorana zero mode (MZM). In addition, we find that Andreev bound states or quasi-Majorana states (QMS) in the topologically trivial bulk phase can give rise to a zero-bias conductance peak, also retaining the transient properties of the MZM. Our results imply that (1) time-resolved transport may be used as a probe to distinguish between the topological MZM and trivial IS; and (2) the QMS mimic the transient signatures of the topological MZMs.File | Dimensione | Formato | |
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