Abstract
We find the admittance of a Josephson junction at or near a topological transition. The dependence of the admittance on frequency and temperature at the critical point is universal and determined by the symmetries of the system. Despite the absence of a spectral gap at the transition, the dissipative response may remain weak at low energies: . This behavior is strikingly different from the electromagnetic response of a normal metal. Away from the critical point, the scaling functions for the dependence of the admittance on frequency and temperature are controlled by at most two parameters.
Original language | English |
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Article number | 014509 |
Number of pages | 22 |
Journal | Physical Review B |
Volume | 104 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2021 |