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Research at St Andrews

Ultrafast triggering of insulator-metal transition in two-dimensional VSe2

Research output: Contribution to journalArticlepeer-review

Open Access Status

  • Embargoed (until 18/02/22)

Author(s)

Deepnarayan Biswas, Alfred J. H. Jones, Paulina Majchrzak, Byoung Ki Choi, Tsung-Han Lee, Klara Volckaert, Jiagui Feng, Igor Marković, Federico Andreatta, Chang-Jong Kang, Hyuk Jin Kim, In Hak Lee, Chris Jozwiak, Eli Rotenberg, Aaron Bostwick, Charlotte E. Sanders, Yu Zhang, Gabriel Karras, Richard T. Chapman, Adam S. Wyatt & 7 more Emma Springate, Jill A. Miwa, Philip Hofmann, Phil D. C. King, Young Jun Chang, Nicola Lanatà, Søren Ulstrup

School/Research organisations

Abstract

The transition-metal dichalcogenide VSe2 exhibits an increased charge density wave transition temperature and an emerging insulating phase when thinned to a single layer. Here, we investigate the interplay of electronic and lattice degrees of freedom that underpin these phases in single-layer VSe2 using ultrafast pump–probe photoemission spectroscopy. In the insulating state, we observe a light-induced closure of the energy gap, which we disentangle from the ensuing hot carrier dynamics by fitting a model spectral function to the time-dependent photoemission intensity. This procedure leads to an estimated time scale of 480 fs for the closure of the gap, which suggests that the phase transition in single-layer VSe2 is driven by electron–lattice interactions rather than by Mott-like electronic effects. The ultrafast optical switching of these interactions in SL VSe2 demonstrates the potential for controlling phase transitions in 2D materials with light.
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Details

Original languageEnglish
Number of pages8
JournalNano Letters
VolumeArticles ASAP
Early online date18 Feb 2021
DOIs
Publication statusE-pub ahead of print - 18 Feb 2021

    Research areas

  • Single-layer VSe2, Metal-insulator transition, Charge density wave, Ultrafast dynamics, Time- and angle-resolved photoemission spectroscopy

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