Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe2

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; Emma Springate; Jill A. Miwa; Philip Hofmann; Phil D.C. King; Young Jun Chang; Nicola Lanatà; Søren Ulstrup

doi:10.1021/acs.nanolett.0c04409

Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe₂

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. WyattEmma Springate, Jill A. Miwa, Philip Hofmann, Phil D.C. King, Young Jun Chang, Nicola Lanatà, Søren Ulstrup^*

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Letter › peer-review

9 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1968-1975
Number of pages	8
Journal	Nano Letters
Volume	21
Issue number	5
Early online date	18 Feb 2021
DOIs	https://doi.org/10.1021/acs.nanolett.0c04409
Publication status	Published - 10 Mar 2021

Bibliographical note

Funding Information:
We thank Phil Rice, Alistair Cox, and David Rose for technical support during the Artemis beamtime. We gratefully acknowledge funding from VILLUM FONDEN through the Young Investigator Program (15375) and the Centre of Excellence for Dirac Materials (11744), the Danish Council for Independent Research, Natural Sciences, under the Sapere Aude program (DFF-9064-00057B and DFF-6108-00409), and the Aarhus University Research Foundation. This work is also supported by National Research Foundation (NRF) grants funded by the Korean government (NRF-2020R1A2C200373211 and 2019K1A3A7A09033389) and by the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The authors also acknowledge The Royal Society and The Leverhulme Trust. Access to the Artemis Facility was funded by STFC. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. The research data supporting this publication can be accessed at Ref. .

Publisher Copyright:
© 2021 American Chemical Society.

Keywords

charge density wave
metal-insulator transition
Single-layer VSe
time- and angle-resolved photoemission spectroscopy
ultrafast dynamics

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Access to Document

10.1021/acs.nanolett.0c04409

Cite this

Biswas, D., Jones, A. J. H., Majchrzak, P., Choi, B. K., Lee, T. H., Volckaert, K., Feng, J., Marković, I., Andreatta, F., Kang, C. J., Kim, H. J., Lee, I. H., Jozwiak, C., Rotenberg, E., Bostwick, A., Sanders, C. E., Zhang, Y., Karras, G., Chapman, R. T., ... Ulstrup, S. (2021). Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe₂. Nano Letters, 21(5), 1968-1975. https://doi.org/10.1021/acs.nanolett.0c04409

@article{c56d74c2d480402d999ce1c393fda907,

title = "Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe2",

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.",

keywords = "charge density wave, metal-insulator transition, Single-layer VSe, time- and angle-resolved photoemission spectroscopy, ultrafast dynamics",

author = "Deepnarayan Biswas and Jones, {Alfred J.H.} and Paulina Majchrzak and Choi, {Byoung Ki} and Lee, {Tsung Han} and Klara Volckaert and Jiagui Feng and Igor Markovi{\'c} and Federico Andreatta and Kang, {Chang Jong} and Kim, {Hyuk Jin} and Lee, {In Hak} and Chris Jozwiak and Eli Rotenberg and Aaron Bostwick and Sanders, {Charlotte E.} and Yu Zhang and Gabriel Karras and Chapman, {Richard T.} and Wyatt, {Adam S.} and Emma Springate and Miwa, {Jill A.} and Philip Hofmann and King, {Phil D.C.} and Chang, {Young Jun} and Nicola Lanat{\`a} and S{\o}ren Ulstrup",

note = "Funding Information: We thank Phil Rice, Alistair Cox, and David Rose for technical support during the Artemis beamtime. We gratefully acknowledge funding from VILLUM FONDEN through the Young Investigator Program (15375) and the Centre of Excellence for Dirac Materials (11744), the Danish Council for Independent Research, Natural Sciences, under the Sapere Aude program (DFF-9064-00057B and DFF-6108-00409), and the Aarhus University Research Foundation. This work is also supported by National Research Foundation (NRF) grants funded by the Korean government (NRF-2020R1A2C200373211 and 2019K1A3A7A09033389) and by the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The authors also acknowledge The Royal Society and The Leverhulme Trust. Access to the Artemis Facility was funded by STFC. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. The research data supporting this publication can be accessed at Ref. . Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",

year = "2021",

month = mar,

day = "10",

doi = "10.1021/acs.nanolett.0c04409",

language = "English",

volume = "21",

pages = "1968--1975",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society",

number = "5",

}

Biswas, D, Jones, AJH, Majchrzak, P, Choi, BK, Lee, TH, Volckaert, K, Feng, J, Marković, I, Andreatta, F, Kang, CJ, Kim, HJ, Lee, IH, Jozwiak, C, Rotenberg, E, Bostwick, A, Sanders, CE, Zhang, Y, Karras, G, Chapman, RT, Wyatt, AS, Springate, E, Miwa, JA, Hofmann, P, King, PDC, Chang, YJ, Lanatà, N & Ulstrup, S 2021, 'Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe₂', Nano Letters, vol. 21, no. 5, pp. 1968-1975. https://doi.org/10.1021/acs.nanolett.0c04409

TY - JOUR

T1 - Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe2

AU - Biswas, Deepnarayan

AU - Jones, Alfred J.H.

AU - Majchrzak, Paulina

AU - Choi, Byoung Ki

AU - Lee, Tsung Han

AU - Volckaert, Klara

AU - Feng, Jiagui

AU - Marković, Igor

AU - Andreatta, Federico

AU - Kang, Chang Jong

AU - Kim, Hyuk Jin

AU - Lee, In Hak

AU - Jozwiak, Chris

AU - Rotenberg, Eli

AU - Bostwick, Aaron

AU - Sanders, Charlotte E.

AU - Zhang, Yu

AU - Karras, Gabriel

AU - Chapman, Richard T.

AU - Wyatt, Adam S.

AU - Springate, Emma

AU - Miwa, Jill A.

AU - Hofmann, Philip

AU - King, Phil D.C.

AU - Chang, Young Jun

AU - Lanatà, Nicola

AU - Ulstrup, Søren

N1 - Funding Information: We thank Phil Rice, Alistair Cox, and David Rose for technical support during the Artemis beamtime. We gratefully acknowledge funding from VILLUM FONDEN through the Young Investigator Program (15375) and the Centre of Excellence for Dirac Materials (11744), the Danish Council for Independent Research, Natural Sciences, under the Sapere Aude program (DFF-9064-00057B and DFF-6108-00409), and the Aarhus University Research Foundation. This work is also supported by National Research Foundation (NRF) grants funded by the Korean government (NRF-2020R1A2C200373211 and 2019K1A3A7A09033389) and by the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The authors also acknowledge The Royal Society and The Leverhulme Trust. Access to the Artemis Facility was funded by STFC. The Advanced Light Source is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. The research data supporting this publication can be accessed at Ref. . Publisher Copyright: © 2021 American Chemical Society.

PY - 2021/3/10

Y1 - 2021/3/10

N2 - 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.

AB - 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.

KW - charge density wave

KW - metal-insulator transition

KW - Single-layer VSe

KW - time- and angle-resolved photoemission spectroscopy

KW - ultrafast dynamics

UR - http://www.scopus.com/inward/record.url?scp=85101921826&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.0c04409

DO - 10.1021/acs.nanolett.0c04409

M3 - Letter

C2 - 33600187

AN - SCOPUS:85101921826

SN - 1530-6984

VL - 21

SP - 1968

EP - 1975

JO - Nano Letters

JF - Nano Letters

IS - 5

ER -