We find the admittance Y (omega) 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: ReY (omega) alpha max(omega, T)(2). 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.
Quantum critical dynamics of a Josephson junction at the topological transition / Kurilovich, Vd; Murthy, C; Kurilovich, Pd; van Heck, B; Glazman, Li; Nayak, C. - In: PHYSICAL REVIEW. B. - ISSN 2469-9950. - 104:1(2021). [10.1103/PhysRevB.104.014509]
Quantum critical dynamics of a Josephson junction at the topological transition
van Heck, B;
2021
Abstract
We find the admittance Y (omega) 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: ReY (omega) alpha max(omega, T)(2). 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
