# Quantum oscillations in the non-centrosymmetric superconductor and topological nodal-line semimetal PbTaSe$_2$

## TL;DR

This study investigates quantum oscillations in PbTaSe$_2$, revealing detailed Fermi surface topology, magnetic breakdown orbits, and Berry phases, which are vital for exploring topological superconductivity in this material.

## Contribution

It provides a comprehensive analysis of the Fermi surface and topological features of PbTaSe$_2$, including Berry phases and magnetic breakdown, advancing understanding of its topological superconductivity potential.

## Key findings

- Quantum oscillations observed in thermoelectric and magnetic torque signals.
- Identification of Fermi surface features near topological nodal rings.
- Detection of Berry phases indicative of topological properties.

## Abstract

We observed quantum oscillations in thermoelectric and magnetic torque signals in non-centrosymmetric superconductor PbTaSe$_2$. One oscillatory frequency stems from the orbits formed by magnetic breakdown, while others are from two-dimensional-like Fermi surfaces near the topological nodal rings. Our comprehensive understanding of the Fermi surface topology of PbTaSe$_2$, including nailing down the Fermi level and detecting the Berry phases near the nodal rings, is crucial for searching plausible topological superconductivity in its bulk and surface states.