Ultrafast dynamics in 2D materials and heterostructures visualized with time- and angle-resolved photoemission

Thomas K. Allison; Zachary H. Withers; Ziling Li; Jin Bakalis; Sergii Chernov; Shuyu Cheng; Gerd Schönhense; Xu Du; Roland Kawakami; Alice Kunin

doi:10.1117/12.3003401

8 March 2024 Ultrafast dynamics in 2D materials and heterostructures visualized with time- and angle-resolved photoemission

Thomas K. Allison, Zachary H. Withers, Ziling Li, Jin Bakalis, Sergii Chernov, Shuyu Cheng, Gerd Schönhense, Xu Du, Roland Kawakami, Alice Kunin

Author Affiliations +

Proceedings Volume 12884, Ultrafast Phenomena and Nanophotonics XXVIII; 128840A (2024) https://doi.org/10.1117/12.3003401
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

The optical and electronic properties of two-dimensional (2D) materials make them attractive for a variety of applications in quantum information processing, solar-energy harvesting, and catalysis. However, the dynamics of electrons, holes, and excitons formed after photo-excitation are often complex and involve many states that are optically dark, making their characterization with optical spectroscopy alone difficult. We present our recent work imaging the quantum states of 2D materials and their heterostructures in momentum space using time- and angle-resolved photoemission. A unique combination of tunable ultrashort extreme ultraviolet (XUV) pulses with 61 MHz repetition rate and time-of-flight momentum microscopy (ToF k-mic) enables the parallel recording of electron dynamics in all states across the full Brillouin zone after perturbative excitation. We will present results on pseudospin dynamics in graphene, valley circular dichroism in monolayer WS₂, and hybridized excitons in MoSe₂/WS₂ bilayers.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Thomas K. Allison, Zachary H. Withers, Ziling Li, Jin Bakalis, Sergii Chernov, Shuyu Cheng, Gerd Schönhense, Xu Du, Roland Kawakami, and Alice Kunin "Ultrafast dynamics in 2D materials and heterostructures visualized with time- and angle-resolved photoemission", Proc. SPIE 12884, Ultrafast Phenomena and Nanophotonics XXVIII, 128840A (8 March 2024); https://doi.org/10.1117/12.3003401

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available