Ultralow Temperature Far-Infrared Spectroscopy of Correlated 2D Materials

ORAL

Abstract

Many interesting quantum states, such as correlated and topological insulators, are associated with energy gaps in the far-infrared regime. Optical spectroscopy can be a useful tool to characterize these states since light can couple to their low energy charge-neutral excitations and reveal information normally inaccessible to electronic measurements. In this talk, we describe the development of nanofabrication and measurement techniques that allow for Far-IR (THz) optical spectroscopy of 2D materials at millikelvin temperatures. In particular, we discuss the photocurrent spectroscopy of 2D materials such as WTe2 and 1T-TaS2 and explore their low energy excitations.

* This work is mainly supported by Gordon and Betty Moore Foundation's EPiQS Initiative (GBMF11946), ONR (N00014-21-1-2804), NSF ( DMR-2011750 & DMR-1942942), and the Eric and Wendy Schmidt Transformative Technology Fund at Princeton.

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Publication: Michael Onyszczak, Ayelet J. Uzan-Narovlansky, Yue Tang, Pengjie Wang, Yanyu Jia, Guo Yu, Tiancheng Song, Ratnadwip Singha, Jason F. Khoury, Leslie M. Schoop, Sanfeng Wu; A platform for far-infrared spectroscopy of quantum materials at millikelvin temperatures. Rev. Sci. Instrum. 1 October 2023; 94 (10): 103903. https://doi.org/10.1063/5.0160321

Presenters

  • Michael Onyszczak

    Princeton University

Authors

  • Michael Onyszczak

    Princeton University

  • Ayelet J Uzan

    Princeton University

  • Yue Tang

    Princeton University

  • Pengjie Wang

    Princeton University

  • Yanyu Jia

    Princeton University

  • Guo Yu

    Princeton University

  • Tiancheng Song

    Princeton University, princeton univeristy

  • Ratnadwip Singha

    Princeton University

  • Jason F Khoury

    Princeton University

  • Leslie M Schoop

    Princeton University

  • Sanfeng Wu

    Princeton University