# Boundary obstructed topological superconductor in buckled honeycomb lattice under perpendicular electric field

## TL;DR

This paper demonstrates that a buckled honeycomb lattice with f-wave spin-triplet pairing can host boundary-obstructed topological superconductivity, with stable corner modes under certain boundary conditions, expanding understanding of topological phases in such materials.

## Contribution

It reveals that boundary-obstructed topological superconductivity can occur in buckled honeycomb lattices with fSTP, especially under nonzero sublattice potential, and links boundary modes to Kitaev chain physics.

## Key findings

- Boundary-obstructed topological superconductor (BOTS) can exist in buckled honeycomb lattices.
- Corner modes remain stable when the boundary is gapped.
- Boundary modes in the normal state relate to Kitaev chain Hamiltonians.

## Abstract

In this work, we show that a buckled honeycomb lattice can host a boundary-obstructed topological superconductor (BOTS) in the presence of f-wave spin-triplet pairing (fSTP). The underlying buckled structure allows for the manipulation of both chemical potential and sublattice potential using a double gate setup. Although a finite sublattice potential can stabilize the fSTP with a possible higher-order band topology, because it also breaks the relevant symmetry, the stability of the corner modes is not guaranteed. Here we show that the fSTP on the honeycomb lattice gives BOTS under nonzero sublattice potential, thus the corner modes can survive as long as the boundary is gapped. Also, by examining the large sublattice potential limit where the honeycomb lattice can be decomposed into two triangular lattices, we show that the boundary modes in the normal state are the quintessential ingredient leading to the BOTS. Thus the effective boundary Hamiltonian becomes nothing but the Hamiltonian for Kitaev chains, which eventually gives the corner modes of the BOTS.