TY - JOUR
T1 - Engineering 2D Material Exciton Line Shape with Graphene/h-BN Encapsulation
AU - Woo, Steffi Y.
AU - Shao, Fuhui
AU - Arora, Ashish
AU - Schneider, Robert
AU - Wu, Nianjheng
AU - Mayne, Andrew J.
AU - Ho, Ching Hwa
AU - Och, Mauro
AU - Mattevi, Cecilia
AU - Reserbat-Plantey, Antoine
AU - Moreno, Álvaro
AU - Sheinfux, Hanan Herzig
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Michaelis de Vasconcellos, Steffen
AU - Koppens, Frank H.L.
AU - Niu, Zhichuan
AU - Stéphan, Odile
AU - Kociak, Mathieu
AU - García de Abajo, F. Javier
AU - Bratschitsch, Rudolf
AU - Konečná, Andrea
AU - Tizei, Luiz H.G.
N1 - Publisher Copyright: © 2024 American Chemical Society.
PY - 2024/3/27
Y1 - 2024/3/27
N2 - Control over the optical properties of atomically thin two-dimensional (2D) layers, including those of transition metal dichalcogenides (TMDs), is needed for future optoelectronic applications. Here, the near-field coupling between TMDs and graphene/graphite is used to engineer the exciton line shape and charge state. Fano-like asymmetric spectral features are produced in WS2, MoSe2, and WSe2 van der Waals heterostructures combined with graphene, graphite, or jointly with hexagonal boron nitride (h-BN) as supporting or encapsulating layers. Furthermore, trion emission is suppressed in h-BN encapsulated WSe2/graphene with a neutral exciton red shift (44 meV) and binding energy reduction (30 meV). The response of these systems to electron beam and light probes is well-described in terms of 2D optical conductivities of the involved materials. Beyond fundamental insights into the interaction of TMD excitons with structured environments, this study opens an unexplored avenue toward shaping the spectral profile of narrow optical modes for application in nanophotonic devices.
AB - Control over the optical properties of atomically thin two-dimensional (2D) layers, including those of transition metal dichalcogenides (TMDs), is needed for future optoelectronic applications. Here, the near-field coupling between TMDs and graphene/graphite is used to engineer the exciton line shape and charge state. Fano-like asymmetric spectral features are produced in WS2, MoSe2, and WSe2 van der Waals heterostructures combined with graphene, graphite, or jointly with hexagonal boron nitride (h-BN) as supporting or encapsulating layers. Furthermore, trion emission is suppressed in h-BN encapsulated WSe2/graphene with a neutral exciton red shift (44 meV) and binding energy reduction (30 meV). The response of these systems to electron beam and light probes is well-described in terms of 2D optical conductivities of the involved materials. Beyond fundamental insights into the interaction of TMD excitons with structured environments, this study opens an unexplored avenue toward shaping the spectral profile of narrow optical modes for application in nanophotonic devices.
KW - electron energy-loss spectroscopy
KW - excitons
KW - transition metal dichalcogenides
KW - two-dimensional materials
KW - van der Waals heterostructure
UR - http://www.scopus.com/inward/record.url?scp=85187715409&partnerID=8YFLogxK
U2 - https://doi.org/10.1021/acs.nanolett.3c05063
DO - https://doi.org/10.1021/acs.nanolett.3c05063
M3 - مقالة
C2 - 38471109
SN - 1530-6984
VL - 24
SP - 3678
EP - 3685
JO - Nano Letters
JF - Nano Letters
IS - 12
ER -