Experimental Measurement of the Intrinsic Excitonic Wave Function

Overview

Journal Sci Adv

Specialties Biology
Science

Date 2021 Apr 22

PMID 33883143

Citations 13

Authors

Michael K L Man

Julien Madeo

Chakradhar Sahoo

Kaichen Xie

Marshall Campbell

Vivek Pareek

Arka Karmakar

E Laine Wong

Abdullah Al-Mahboob

Nicholas S Chan

David R Bacon

Xing Zhu

Mohamed M M Abdelrasoul

Xiaoqin Li

Tony F Heinz

Felipe H da Jornada

Ting Cao

Keshav M Dani

Affiliations

Soon will be listed here.

Abstract

An exciton, a two-body composite quasiparticle formed of an electron and hole, is a fundamental optical excitation in condensed matter systems. Since its discovery nearly a century ago, a measurement of the excitonic wave function has remained beyond experimental reach. Here, we directly image the excitonic wave function in reciprocal space by measuring the momentum distribution of electrons photoemitted from excitons in monolayer tungsten diselenide. By transforming to real space, we obtain a visual of the distribution of the electron around the hole in an exciton. Further, by also resolving the energy coordinate, we confirm the elusive theoretical prediction that the photoemitted electron exhibits an inverted energy-momentum dispersion relationship reflecting the valence band where the partner hole remains, rather than that of conduction band states of the electron.

Citing Articles

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Element-Specific Ultrafast Lattice Dynamics in Monolayer WSe.

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Berry curvature signatures in chiroptical excitonic transitions.

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