Coherent dynamics and mapping of excitons in single-layer MoSe2 and WSe2 at the homogeneous limit

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F20%3A73603968" target="_blank" >RIV/61989592:15310/20:73603968 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26620/20:PU137324

Result on the web

<a href="https://obd.upol.cz/id_publ/333183854" target="_blank" >https://obd.upol.cz/id_publ/333183854</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevMaterials.4.034001" target="_blank" >10.1103/PhysRevMaterials.4.034001</a>

Result language

angličtina

Original language name

Coherent dynamics and mapping of excitons in single-layer MoSe2 and WSe2 at the homogeneous limit

Original language description

We perform coherent nonlinear spectroscopy of excitons in single-layers of MoSe2 and WSe2 encapsulated between thin films of hexagonal boron nitride. Employing four-wave-mixing microscopy we identify virtually disorder-free areas, generating an exciton optical response at the homogeneous limit. Focussing on such areas, we measure exciton homogeneous broadening as a function of environmental factors, namely temperature and exciton density. Exploiting four-wave-mixing imaging, we find that at such locations, nonlinear absorption of the exciton excited states and their coherent couplings can be observed. Using the WSe2 heterostructure, we infer coherence and density dynamics of the exciton 2S state. Owing to its increased radiative lifetime, at low temperatures, the dephasing of the 2S state is longer than of the 1S transition. While scanning various heterostructures across tens of micrometers, we conclude that the disorder, principally induced by strain variations, remain to be present creating spatially varying inhomogeneous broadening.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10403 - Physical chemistry

Project

<a href="/en/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review Materials

ISSN

2475-9953

e-ISSN

—

Volume of the periodical

4

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

8

Pages from-to

"034001-1"-"034001-8"

UT code for WoS article

000518538400001

EID of the result in the Scopus database

2-s2.0-85083396734