Measurement of the spin-forbidden dark excitons in MoS2 and MoSe2 monolayers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU137790" target="_blank" >RIV/00216305:26620/20:PU137790 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.nature.com/articles/s41467-020-17608-4" target="_blank" >https://www.nature.com/articles/s41467-020-17608-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41467-020-17608-4" target="_blank" >10.1038/s41467-020-17608-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of the spin-forbidden dark excitons in MoS2 and MoSe2 monolayers

Popis výsledku v původním jazyce

Excitons with binding energies of a few hundreds of meV control the optical properties of transition metal dichalcogenide monolayers. Knowledge of the fine structure of these excitons is therefore essential to understand the optoelectronic properties of these 2D materials. Here we measure the exciton fine structure of MoS2 and MoSe2 monolayers encapsulated in boron nitride by magneto-photoluminescence spectroscopy in magnetic fields up to 30T. The experiments performed in transverse magnetic field reveal a brightening of the spin-forbidden dark excitons in MoS2 monolayer: we find that the dark excitons appear at 14meV below the bright ones. Measurements performed in tilted magnetic field provide a conceivable description of the neutral exciton fine structure. The experimental results are in agreement with a model taking into account the effect of the exchange interaction on both the bright and dark exciton states as well as the interaction with the magnetic field. Excitons control the optical properties of transition metal dichalcogenide monolayers. Here, the authors measure the exciton fine structure of MoS2 and MoSe2 monolayers encapsulated in hBN in magnetic fields up to 30T, and observe a brightening of the spin-forbidden dark excitons in MoS2.

Název v anglickém jazyce

Measurement of the spin-forbidden dark excitons in MoS2 and MoSe2 monolayers

Popis výsledku anglicky

Excitons with binding energies of a few hundreds of meV control the optical properties of transition metal dichalcogenide monolayers. Knowledge of the fine structure of these excitons is therefore essential to understand the optoelectronic properties of these 2D materials. Here we measure the exciton fine structure of MoS2 and MoSe2 monolayers encapsulated in boron nitride by magneto-photoluminescence spectroscopy in magnetic fields up to 30T. The experiments performed in transverse magnetic field reveal a brightening of the spin-forbidden dark excitons in MoS2 monolayer: we find that the dark excitons appear at 14meV below the bright ones. Measurements performed in tilted magnetic field provide a conceivable description of the neutral exciton fine structure. The experimental results are in agreement with a model taking into account the effect of the exchange interaction on both the bright and dark exciton states as well as the interaction with the magnetic field. Excitons control the optical properties of transition metal dichalcogenide monolayers. Here, the authors measure the exciton fine structure of MoS2 and MoSe2 monolayers encapsulated in hBN in magnetic fields up to 30T, and observe a brightening of the spin-forbidden dark excitons in MoS2.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

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

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

NATURE COMMUNICATIONS

ISSN

2041-1723

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

8

Strana od-do

„4037-1“-„4037-8“

Kód UT WoS článku

000563564000004

EID výsledku v databázi Scopus

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