Direct Observation of Ultrafast Exciton Formation in a Monolayer of WSe2
نویسندگان
چکیده
منابع مشابه
Direct Observation of Ultrafast Exciton Formation in a Monolayer of WSe2.
Many of the fundamental optical and electronic properties of atomically thin transition metal dichalcogenides are dominated by strong Coulomb interactions between electrons and holes, forming tightly bound atom-like states called excitons. Here, we directly trace the ultrafast formation of excitons by monitoring the absolute densities of bound and unbound electron-hole pairs in single monolayer...
متن کاملDirect measurement of exciton valley coherence in monolayer WSe2
In crystals, energy band extrema in momentum space can be identified by a valley index. The internal quantum degree of freedom associated with valley pseudospin indices can act as a useful information carrier, analogous to electronic charge or spin1–4. Interest in valleytronics has been revived in recent years following the discovery of atomically thin materials such as graphene and transition ...
متن کاملRoom-temperature Tamm-plasmon exciton-polaritons with a WSe2 monolayer
Solid-state cavity quantum electrodynamics is a rapidly advancing field, which explores the frontiers of light-matter coupling. Metal-based approaches are of particular interest in this field, as they carry the potential to squeeze optical modes to spaces significantly below the diffraction limit. Transition metal dichalcogenides are ideally suited as the active material in cavity quantum elect...
متن کاملEnabling valley selective exciton scattering in monolayer WSe2 through upconversion
Excitons, Coulomb bound electron-hole pairs, are composite bosons and their interactions in traditional semiconductors lead to condensation and light amplification. The much stronger Coulomb interaction in transition metal dichalcogenides such as WSe2 monolayers combined with the presence of the valley degree of freedom is expected to provide new opportunities for controlling excitonic effects....
متن کاملDirect determination of monolayer MoS2 and WSe2 exciton binding energies on insulating and metallic substrates
Understanding the excitonic nature of excited states in two-dimensional (2D) transition-metaldichalcogenides (TMDCs) is of key importance to make use of their optical and charge transportproperties in optoelectronic applications. We contribute to this by the direct experimentaldetermination of the exciton binding energy (Eb,exc) of monolayer MoS2 and WSe2 on twofundamentally...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nano Letters
سال: 2017
ISSN: 1530-6984,1530-6992
DOI: 10.1021/acs.nanolett.6b04422