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

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

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
Number of pages	8
Journal	Nano Letters
Volume	Articles ASAP
Early online date	18 Feb 2021
DOIs	https://doi.org/10.1021/acs.nanolett.0c04409
Publication status	E-pub ahead of print - 18 Feb 2021

Keywords

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

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10.1021/acs.nanolett.0c04409

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Copyright © 2021 American Chemical Society. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acs.nanolett.0c04409.
Accepted author manuscript, 3.91 MB
SuppMatAccepted author manuscript, 6.84 MB

RS Phil King: Electronic Structure Engineering of Novel Topological Phases
King, P. (PI)
1/10/18 → 30/09/21
Project: Fellowship
Engineered Quantum States: Engineered quantum states via atmoic-scale assembly of artificial 2D heterostructures
King, P. (PI)
The Leverhulme Trust
1/08/17 → 31/07/22
Project: Standard
Designer Oxides - Equipment: Designer Oxides: Reactive-Oxiode Molecular Beam Epitaxy System
Wahl, P. (PI)
EPSRC
1/09/15 → 31/08/17
Project: Standard

Ultrafast triggering of insulator-metal transition in two-dimensional VSe2 (dataset)
Biswas, D. (Creator), Jones, A. (Creator), Majchrzak, P. (Creator), Choi, B. (Creator), Lee, T. (Creator), Volckaert, K. (Creator), Feng, J. (Creator), Markovic, I. (Creator), Andreatta, F. (Creator), Kang, C. (Creator), kim, H. (Creator), Lee, I. (Creator), Jozwiak, C. (Creator), Rotenberg, E. (Creator), Bostwick, A. (Creator), Sanders, C. (Creator), Zhang, Y. (Creator), Karras, G. (Creator), Chapman, R. (Creator), Wyatt, A. (Creator), Springate, E. (Creator), Miwa, J. (Creator), Hofmann, P. (Creator), King, P. (Creator), Chang, J. (Creator), Lanata, N. (Creator) & Ulstrup, S. (Creator), University of St Andrews, 9 Mar 2021
DOI: 10.17630/f90f7396-85a4-40c0-a081-7df0e8990057
Dataset

File

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, Articles ASAP. Advance online publication. https://doi.org/10.1021/acs.nanolett.0c04409

@article{0291cfbe081643f69c0dbf53341cbd4c,

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

author = "Deepnarayan Biswas and Jones, {Alfred J. H.} and Paulina Majchrzak and Choi, {Byoung Ki} and Tsung-Han Lee and Klara Volckaert and Jiagui Feng and Igor Markovi{\'c} and Federico Andreatta and Chang-Jong Kang 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: VILLUM FONDEN through the Young Investigator Program (Grant. No. 15375) and the Centre of Excellence for Dirac Materials (Grant. No. 11744), the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant Nos. 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 (nos. NRF-2020R1A2C200373211 and 2019K1A3A7A09033389) and by the International Max PlanckResearch School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The authors also acknowledge The Royal Society and The Leverhulme Trust. ",

year = "2021",

month = feb,

day = "18",

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

language = "English",

volume = "Articles ASAP",

journal = "Nano Letters",

issn = "1530-6984",

publisher = "American Chemical Society (ACS)",

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Biswas, D, Jones, AJH, Majchrzak, P, Choi, BK, Lee, T-H, Volckaert, K, Feng, J, Marković, I, Andreatta, F, Kang, C-J, 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. Articles ASAP. 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: VILLUM FONDEN through the Young Investigator Program (Grant. No. 15375) and the Centre of Excellence for Dirac Materials (Grant. No. 11744), the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant Nos. 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 (nos. NRF-2020R1A2C200373211 and 2019K1A3A7A09033389) and by the International Max PlanckResearch School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). The authors also acknowledge The Royal Society and The Leverhulme Trust.

PY - 2021/2/18

Y1 - 2021/2/18

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 - Single-layer VSe2

KW - Metal-insulator transition

KW - Charge density wave

KW - Ultrafast dynamics

KW - Time- and angle-resolved photoemission spectroscopy

U2 - 10.1021/acs.nanolett.0c04409

DO - 10.1021/acs.nanolett.0c04409

M3 - Article

SN - 1530-6984

VL - Articles ASAP

JO - Nano Letters

JF - Nano Letters

ER -

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

Abstract

Keywords

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Projects

RS Phil King: Electronic Structure Engineering of Novel Topological Phases

Engineered Quantum States: Engineered quantum states via atmoic-scale assembly of artificial 2D heterostructures

Designer Oxides - Equipment: Designer Oxides: Reactive-Oxiode Molecular Beam Epitaxy System

Datasets

Ultrafast triggering of insulator-metal transition in two-dimensional VSe2 (dataset)

Cite this

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