Rydberg series of intralayer K-excitons in WSe2 multilayers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10487234" target="_blank" >RIV/00216208:11320/24:10487234 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Zz_ilfCzX-" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Zz_ilfCzX-</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.110.155439" target="_blank" >10.1103/PhysRevB.110.155439</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Rydberg series of intralayer K-excitons in WSe2 multilayers

Popis výsledku v původním jazyce

Semiconducting transition metal dichalcogenides of group VI are well known for their prominent excitonic effects and the transition from an indirect to a direct band gap when reduced to monolayers. While considerable efforts have elucidated the Rydberg series of excitons in monolayers, understanding their properties in multilayers remains incomplete. In these structures, despite an indirect band gap, momentum-direct excitons largely shape the optical response. In this work, we combine magnetoreflectance experiments with theoretical modeling based on the k.p approach to investigate the origin of excitonic resonances in WSe2 bi, tri, and quadlayers. For all investigated thicknesses, we observe a series of excitonic resonances in the reflectance spectra, initiated by a ground state with an amplitude comparable to the ground state of the 1s exciton in the monolayer. Higher-energy states exhibit a decrease in intensity with increasing energy, as expected for the excited states of the Rydberg series, although a significant increase in the diamagnetic shift is missing in tri and quadlayers. By comparing the experimental observations with theoretical predictions, we discover that the excitonic resonances observed in trilayers originate from two Rydberg series, while quadlayers exhibit four such series, and bilayers host a single Rydberg series similar to that found in monolayers.

Název v anglickém jazyce

Rydberg series of intralayer K-excitons in WSe2 multilayers

Popis výsledku anglicky

Semiconducting transition metal dichalcogenides of group VI are well known for their prominent excitonic effects and the transition from an indirect to a direct band gap when reduced to monolayers. While considerable efforts have elucidated the Rydberg series of excitons in monolayers, understanding their properties in multilayers remains incomplete. In these structures, despite an indirect band gap, momentum-direct excitons largely shape the optical response. In this work, we combine magnetoreflectance experiments with theoretical modeling based on the k.p approach to investigate the origin of excitonic resonances in WSe2 bi, tri, and quadlayers. For all investigated thicknesses, we observe a series of excitonic resonances in the reflectance spectra, initiated by a ground state with an amplitude comparable to the ground state of the 1s exciton in the monolayer. Higher-energy states exhibit a decrease in intensity with increasing energy, as expected for the excited states of the Rydberg series, although a significant increase in the diamagnetic shift is missing in tri and quadlayers. By comparing the experimental observations with theoretical predictions, we discover that the excitonic resonances observed in trilayers originate from two Rydberg series, while quadlayers exhibit four such series, and bilayers host a single Rydberg series similar to that found in monolayers.

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/GA23-06369S" target="_blank" >GA23-06369S: Role dekoherence v nelineárních optických interakcích vysokého řádu</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

110

Číslo periodika v rámci svazku

15

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

155439

Kód UT WoS článku

001350225300001

EID výsledku v databázi Scopus

2-s2.0-85208075645