Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe2

Thomas Siday; Fabian Sandner; Samuel Brem; Martin Zizlsperger; Raul Perea-Causin; Felix Schiegl; Svenja Nerreter; Markus Plankl; Philipp Merkl; Fabian Mooshammer; Markus A. Huber; Ermin Malic; Rupert Huber

doi:10.1109/IRMMW-THz50927.2022.9895814

Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe₂

Thomas Siday
, Fabian Sandner
, Samuel Brem
, Martin Zizlsperger
, Raul Perea-Causin
, Felix Schiegl
, Svenja Nerreter
, Markus Plankl
, Philipp Merkl
, Fabian Mooshammer
, Markus A. Huber
, Ermin Malic
, Rupert Huber

Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The density-driven transition of an exciton gas into a plasma of unbound electron-hole pairs has provided a compelling testbed for exploring many-body physics. Here, we use ultrafast polarization nanoscopy to trace a Mott transition of excitons in a twisted bilayer of WSe₂. An initially monomolecular recombination of optically dark excitons continuously evolves into bimolecular recombination of unbound electrons and holes as the density is increased. Furthermore, we reveal directly how the Mott transition varies on nanometer length scales, demonstrating how the technique is indispensable in the study of intrinsically disordered van der Waals materials.

Original language	English
Title of host publication	2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Publisher	IEEE
Number of pages	2
ISBN (Electronic)	9781728194271
ISBN (Print)	9781728194288 (PoD)
DOIs	https://doi.org/10.1109/IRMMW-THz50927.2022.9895814
Publication status	Published - 26 Sept 2022
Event	47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022 - Delft, Netherlands Duration: 28 Aug 2022 → 2 Sept 2022

Publication series

Name	International Conference on Infrared, Millimeter, and Terahertz Waves
ISSN (Print)	2162-2027
ISSN (Electronic)	2162-2035

Conference

Conference	47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022
Country/Territory	Netherlands
City	Delft
Period	28/08/22 → 2/09/22

Bibliographical note

Publisher Copyright:
© 2022 IEEE.

Keywords

Optical polarization
Excitons
Radiative recombination
Superconductivity
Superconducting magnets
Nanoscale devices
Plasmas

ASJC Scopus subject areas

Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1109/IRMMW-THz50927.2022.9895814

Cite this

Siday, T., Sandner, F., Brem, S., Zizlsperger, M., Perea-Causin, R., Schiegl, F., Nerreter, S., Plankl, M., Merkl, P., Mooshammer, F., Huber, M. A., Malic, E., & Huber, R. (2022). Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe₂. In 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz) Article 9895814 (International Conference on Infrared, Millimeter, and Terahertz Waves). IEEE. https://doi.org/10.1109/IRMMW-THz50927.2022.9895814

@inproceedings{5f72dac247664321998bcf1b5ed215bb,

title = "Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe2",

abstract = "The density-driven transition of an exciton gas into a plasma of unbound electron-hole pairs has provided a compelling testbed for exploring many-body physics. Here, we use ultrafast polarization nanoscopy to trace a Mott transition of excitons in a twisted bilayer of WSe2. An initially monomolecular recombination of optically dark excitons continuously evolves into bimolecular recombination of unbound electrons and holes as the density is increased. Furthermore, we reveal directly how the Mott transition varies on nanometer length scales, demonstrating how the technique is indispensable in the study of intrinsically disordered van der Waals materials.",

keywords = "Optical polarization, Excitons, Radiative recombination, Superconductivity, Superconducting magnets, Nanoscale devices, Plasmas",

author = "Thomas Siday and Fabian Sandner and Samuel Brem and Martin Zizlsperger and Raul Perea-Causin and Felix Schiegl and Svenja Nerreter and Markus Plankl and Philipp Merkl and Fabian Mooshammer and Huber, \{Markus A.\} and Ermin Malic and Rupert Huber",

note = "Publisher Copyright: {\textcopyright} 2022 IEEE.; 47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022 ; Conference date: 28-08-2022 Through 02-09-2022",

year = "2022",

month = sep,

day = "26",

doi = "10.1109/IRMMW-THz50927.2022.9895814",

language = "English",

isbn = "9781728194288 (PoD)",

series = "International Conference on Infrared, Millimeter, and Terahertz Waves",

publisher = "IEEE",

booktitle = "2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)",

}

Siday, T, Sandner, F, Brem, S, Zizlsperger, M, Perea-Causin, R, Schiegl, F, Nerreter, S, Plankl, M, Merkl, P, Mooshammer, F, Huber, MA, Malic, E & Huber, R 2022, Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe₂. in 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)., 9895814, International Conference on Infrared, Millimeter, and Terahertz Waves, IEEE, 47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022, Delft, Netherlands, 28/08/22. https://doi.org/10.1109/IRMMW-THz50927.2022.9895814

Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe₂. / Siday, Thomas; Sandner, Fabian; Brem, Samuel et al.
2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2022. 9895814 (International Conference on Infrared, Millimeter, and Terahertz Waves).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe2

AU - Siday, Thomas

AU - Sandner, Fabian

AU - Brem, Samuel

AU - Zizlsperger, Martin

AU - Perea-Causin, Raul

AU - Schiegl, Felix

AU - Nerreter, Svenja

AU - Plankl, Markus

AU - Merkl, Philipp

AU - Mooshammer, Fabian

AU - Huber, Markus A.

AU - Malic, Ermin

AU - Huber, Rupert

PY - 2022/9/26

Y1 - 2022/9/26

N2 - The density-driven transition of an exciton gas into a plasma of unbound electron-hole pairs has provided a compelling testbed for exploring many-body physics. Here, we use ultrafast polarization nanoscopy to trace a Mott transition of excitons in a twisted bilayer of WSe2. An initially monomolecular recombination of optically dark excitons continuously evolves into bimolecular recombination of unbound electrons and holes as the density is increased. Furthermore, we reveal directly how the Mott transition varies on nanometer length scales, demonstrating how the technique is indispensable in the study of intrinsically disordered van der Waals materials.

AB - The density-driven transition of an exciton gas into a plasma of unbound electron-hole pairs has provided a compelling testbed for exploring many-body physics. Here, we use ultrafast polarization nanoscopy to trace a Mott transition of excitons in a twisted bilayer of WSe2. An initially monomolecular recombination of optically dark excitons continuously evolves into bimolecular recombination of unbound electrons and holes as the density is increased. Furthermore, we reveal directly how the Mott transition varies on nanometer length scales, demonstrating how the technique is indispensable in the study of intrinsically disordered van der Waals materials.

KW - Optical polarization

KW - Excitons

KW - Radiative recombination

KW - Superconductivity

KW - Superconducting magnets

KW - Nanoscale devices

KW - Plasmas

UR - https://www.scopus.com/pages/publications/85139869356

U2 - 10.1109/IRMMW-THz50927.2022.9895814

DO - 10.1109/IRMMW-THz50927.2022.9895814

M3 - Conference contribution

AN - SCOPUS:85139869356

SN - 9781728194288 (PoD)

T3 - International Conference on Infrared, Millimeter, and Terahertz Waves

BT - 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

PB - IEEE

T2 - 47th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2022

Y2 - 28 August 2022 through 2 September 2022

ER -

Siday T, Sandner F, Brem S, Zizlsperger M, Perea-Causin R, Schiegl F et al. Ultrafast Nanoscopy of an Exciton Mott Transition in Twisted Bilayer WSe₂. In 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE. 2022. 9895814. (International Conference on Infrared, Millimeter, and Terahertz Waves). doi: 10.1109/IRMMW-THz50927.2022.9895814