# First principles investigation of topological phase in XMR material TmSb under hydrostatic pressure

## TL;DR

This study uses first principles calculations to show that the topological phase of TmSb, an XMR material, can be controlled by hydrostatic pressure, revealing a reentrant topological behavior without structural phase change.

## Contribution

It demonstrates the pressure-induced topological phase transition and reentrant behavior in TmSb, a trivial semimetal, using first principles calculations.

## Key findings

- Topological phase transition at 12 GPa with band inversion at X point.
- Reentrant trivial phase at 15 GPa with band inversion at Γ and X points.
- Topological transitions occur below structural phase transition pressure.

## Abstract

In this article, we report emergence of topological phase in XMR material TmSb under hydrostatic pressure using first principles calculations. We find that TmSb, a topologically trivial semimetal, undergoes a topological phase transition with band inversion at X point without breaking any symmetry under a hydrostatic pressure of 12 GPa. At 15 GPa, it again becomes topologically trivial with band inversion at $\Gamma$ as well as X point. We find that the pressures corresponding to the topological phase transitions are far below the pressure corresponding to structural phase transition at 25.5 GPa. The reentrant behaviour of topological quantum phase with hydrostatic pressure would help in finding a correlation between topology and XMR effect through experiments.