Pressure Driven Phase Transition in 1T-TiSe$_2$ , a MOIPT+DMFT Study

TL;DR

This study investigates pressure-induced superconductivity in 1T-TiSe$_2$ using a combined MOIPT+DMFT approach, revealing a superconducting phase emerging around 2 GPa and persisting up to 4 GPa.

Contribution

It introduces a detailed theoretical analysis of pressure-driven phase transitions in 1T-TiSe$_2$ using advanced many-body techniques, highlighting the role of excitonic liquids.

Findings

Superconductivity appears near 2 GPa pressure at 2 K.

Superconducting phase persists up to 4 GPa.

Pressure influences charge density wave and excitonic states.

Abstract

The nature of unconventional superconductivity associated with charge density wave order in transition metal dichalcogenides is currently a debated issue. Starting from a normal state elec- tronic structure followed by a charge ordered state how superconductivity in 1T-TiSe 2 arises with applied pressure is still under research. A preformed excitonic liquid driven ordered state mediated superconductivity is found in broad class of TMD on the border of CDW. Using dynamical mean field theory with input from noninteracting band structure calculation, I show a superconducting phase appears near about 2 GPa pressure at a temperature of 2 K and this region persists upto 4 GPa Pressure.