Presentation Information

10:15 AM - 10:30 AM JST(1:15 AM - 1:30 AM UTC)English Presentation

[8a-N204-2]Study of Spin-Dark Excitons in 2D Semiconductors by time-resolved Momentum Microscopy

〇(D)Xing Zhu¹, David R. Bacon¹, Vivek Pareek¹, Julien Madeo¹, Kenji Watanabe², Takashi Taniguchi², Michael K. L. Man¹, Mit H Naik³, Keshav M. Dani¹ (1.FSU, OIST, 2.NIMS, 3.UT Austin)

Keywords:

2D semiconductors,Exciton,Photoelectron spectroscopy

Excitons - quasiparticles formed by coulomb-bounded electron-hole pairs, plays key role on fundamental optical excitations of 2D semiconductors. For the prototypical 2D semiconductors 1L WS₂, a complex excitonic landscape exists, including a significant population of spin- or momentum- dark excitons. This landscape is closely connected with the spin and valley configuration of exciton constituents - electrons and holes [1-3]. While dark excitons are generally invisible to light limited by optical selection rule, time- and angle- resolved photoemission spectroscopy (TR-ARPES) has been successfully used to visualize the dark excitons [4-6]. In this talk, we will focus on the momentum resolved study of spin- and momentum-dark excitons in 2D semiconductors by TR-ARPES.

Back to Session information