Open Access System for Information Sharing

Login Library

 

Article
Cited 1 time in webofscience Cited 0 time in scopus
Metadata Downloads

Electrical control of anisotropic and tightly bound excitons in bilayer phosphorene

Title
Electrical control of anisotropic and tightly bound excitons in bilayer phosphorene
Authors
YOON, SANGHOKIM, TAEHOSEO, SEUNGYOUNGSHIN, SEUNG HYUNSONG, SU BEOMKim, B. J.Watanabe, KenjiTaniguchi, TakashiLee, Gil-HoJO, MOON HOQiu, Diana Y.KIM, JONGHWAN
Date Issued
2021-01
Publisher
American Physical Society (APS)
Abstract
Monolayer and few-layer phosphorene are anisotropic quasi-two-dimensional (quasi-2D) van der Waals (vdW) semiconductors with the linear-dichroic light-matter interaction and the widely tunable direct band gap in the infrared frequency range. Despite recent theoretical predictions of strongly bound excitons with unique properties, it remains experimentally challenging to probe excitonic quasiparticles due to the severe oxidation that occurs during device fabrication. In this study, we report the observation of strongly bound excitons and trions with highly anisotropic optical properties in intrinsic bilayer phosphorene, which are protected from oxidation by encapsulation with hexagonal boron nitride (hBN) in a field-effect transistor (FET) geometry. Reflection contrast and photoluminescence spectroscopy clearly reveal the linear-dichroic optical spectra from anisotropic excitons and trions in the hBN-encapsulated bilayer phosphorene. The optical resonances from the exciton Rydberg series indicate that the neutral exciton binding energy is over 100 meV even with the dielectric screening from hBN. The electrostatic injection of free holes enables an additional optical resonance from a positive trion (charged exciton) ∼30 meV below the optical band gap of the charge-neutral system. Our work shows exciting possibilities for monolayer and few-layer phosphorene as a platform to explore many-body physics and photonics and optoelectronics based on strongly bound excitons with twofold anisotropy.
URI
https://oasis.postech.ac.kr/handle/2014.oak/105344
ISSN
2469-9950
Article Type
Article
Citation
Physical Review B, vol. 103, no. 4, 2021-01
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

김종환KIM, JONGHWAN
Dept of Materials Science & Enginrg
Read more

Views & Downloads

Browse