Universal dynamical scaling of long-range topological superconductors

Nicolò Defenu, Giovanna Morigi, Luca Dell'Anna, and Tilman Enss
Phys. Rev. B 100, 184306 – Published 20 November 2019

Abstract

We study the out-of-equilibrium dynamics of p-wave superconducting quantum wires with long-range interactions when the chemical potential is linearly ramped across the topological phase transition. We show that the heat produced after the quench scales with the quench rate δ according to the scaling law δθ where the exponent θ depends on the power-law exponent of the long-range interactions. The presence of the long-range pairing term increases the exponent θ and thus improves the adiabatic preparation of topological states. Moreover, we identify the parameter regimes where the heat scaling can be cast in terms of the universal equilibrium critical exponents and can thus be understood within the Kibble-Zurek framework. When the electron hopping decays more slowly in space than pairing, it dominates the equilibrium scaling. Surprisingly, in this regime the dynamical critical behavior arises only from pairing and thus exhibits a dynamical universality unrelated to equilibrium scaling. The discrepancy from the expected Kibble-Zurek scenario can be traced back to the presence of multiple universal terms in the equilibrium scaling functions of long-range interacting systems close to a second order critical point.

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  • Received 25 June 2019
  • Revised 11 October 2019

DOI:https://doi.org/10.1103/PhysRevB.100.184306

©2019 American Physical Society

Physics Subject Headings (PhySH)

General PhysicsAtomic, Molecular & OpticalStatistical Physics & Thermodynamics

Authors & Affiliations

Nicolò Defenu1, Giovanna Morigi2, Luca Dell'Anna3, and Tilman Enss1

  • 1Institut für Theoretische Physik, Universität Heidelberg, D-69120 Heidelberg, Germany
  • 2Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany
  • 3Dipartimento di Fisica e Astronomia G. Galilei, Università degli studi di Padova, via Marzolo 8, 35131 Padova, Italy

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Issue

Vol. 100, Iss. 18 — 1 November 2019

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