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  • Letter

First-order topological phase transitions and disorder-induced Majorana modes in interacting fermion chains

Shruti Agarwal1, Shreekant Gawande1, Satoshi Nishimoto2,3, Jeroen van den Brink2,3, and Sanjeev Kumar1,3

  • 1Department of Physical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli PO 140306, India
  • 2Department of Physics, Technical University Dresden, 01069 Dresden, Germany
  • 3Institute for Theoretical Solid State Physics, IFW Dresden, 01069 Dresden, Germany

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Phys. Rev. B 107, L121106 – Published 20 March, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L121106

Abstract

Using a combination of the mean-field Bogoliubov–de Gennes approach and the density matrix renormalization group method, we discover first-order topological transitions between topological superconducting and trivial insulating phases in a sawtooth lattice of intersite attractive fermions. The topological characterization of different phases is achieved in terms of winding numbers, Majorana edge modes, and entanglement spectra. By studying the effect of disorder on first-order topological phase transitions, we establish disorder-induced topological phase coexistence as a mechanism for generating a finite density of Majorana particles.

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Phys. Rev. B 107, L121106– Published 20 March, 2023
  • Received 11 April 2022
  • Revised 21 February 2023
  • Accepted 27 February 2023
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