Ultrafast Creation of a Light-induced Semimetallic State in Strongly Excited 1T-TiSe

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2024 May 10

PMID 38728393

Authors

Maximilian Huber

Yi Lin

Giovanni Marini

Luca Moreschini

Chris Jozwiak

Aaron Bostwick

Matteo Calandra

Alessandra Lanzara

Affiliations

Soon will be listed here.

Abstract

Screening, a ubiquitous phenomenon associated with the shielding of electric fields by surrounding charges, has been widely adopted as a means to modify a material's properties. While most studies have relied on static changes of screening through doping or gating thus far, here we demonstrate that screening can also drive the onset of distinct quantum states on the ultrafast timescale. By using time- and angle-resolved photoemission spectroscopy, we show that intense optical excitation can drive 1T-TiSe, a prototypical charge density wave material, almost instantly from a gapped into a semimetallic state. By systematically comparing changes in band structure over time and excitation strength with theoretical calculations, we find that the appearance of this state is likely caused by a dramatic reduction of the screening length. In summary, this work showcases how optical excitation enables the screening-driven design of a nonequilibrium semimetallic phase in TiSe, possibly providing a general pathway into highly screened phases in other strongly correlated materials.

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