The Majorana STM as a perfect detector of odd-frequency superconductivity
arXiv:1612.03356 · doi:10.1103/PhysRevB.95.174516
Abstract
We propose a novel scanning tunneling microscope (STM) device in which the tunneling tip is formed by a Majorana bound state (MBS). This peculiar bound state exists at the boundary of a one-dimensional topological superconductor. Since the MBS has to be effectively spinless and local, we argue that it is the smallest unit that shows itself odd-frequency superconducting pairing. Odd-frequency superconductivity is characterized by an anomalous Green function which is an odd function of the time arguments of the two electrons forming the Cooper pair. Interestingly, our Majorana STM can be used as the perfect detector of odd-frequency superconductivity. The reason is that a supercurrent between the Majorana STM and any other superconductor can only flow if the latter system exhibits itself odd-frequency pairing. To illustrate our general idea, we consider the tunneling problem of the Majorana STM coupled to a quantum dot in vicinity to a conventional superconductor. In such a (superconducting) quantum dot, the effective pairing can be tuned from even- to odd-frequency behavior if an external magnetic field is applied to it.
4 pages, 2 figures
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- Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking
- Phase-dependent heat and charge transport through superconductor-quantum dot hybrids
- From fractional solitons to Majorana fermions in a paradigmatic model of topological superconductivity
- Odd-frequency Superconductivity Revealed by Thermopower
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- Signature of odd-frequency equal-spin triplet pairing in the Josephson current on the surface of Weyl nodal loop semimetals
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- Thermoelectric detection of Andreev states in unconventional superconductors
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- Surface induced odd-frequency spin-triplet superconductivity as a veritable signature of Majorana bound states
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- Odd-frequency Pairing in Josephson Junctions Coupled by Magnetic Textures
- Identification of odd-frequency superconducting pairing in Josephson junctions