Exciton valley dynamics in monolayer WSe2 probed by the two-color ultrafast Kerr rotation
نویسندگان
چکیده
منابع مشابه
Enabling 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 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 کاملTemporal and spatial valley dynamics in two-dimensional semiconductors probed via Kerr rotation
Jiani Huang,1 Thang B. Hoang,1,* Tian Ming,2 Jing Kong,2 and Maiken H. Mikkelsen1,3 1Department of Physics, Duke University, Durham, North Carolina 27708, USA 2Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA ...
متن کاملValley depolarization in monolayer WSe2
We have systematically examined the circular polarization of monolayer WSe2 at different temperature, excitation energy and exciton density. The valley depolarization in WSe2 is experimentally confirmed to be governed by the intervalley electron-hole exchange interaction. More importantly, a non-monotonic dependence of valley circular polarization on the excitation power density has been observ...
متن کاملUltrafast valley relaxation dynamics in monolayer MoS2 probed by nonequilibrium optical techniques
S. Dal Conte,1,2 F. Bottegoni,2 E. A. A. Pogna,2 D. De Fazio,3 S. Ambrogio,4 I. Bargigia,5 C. D’Andrea,2,5 A. Lombardo,3 M. Bruna,3 F. Ciccacci,2 A. C. Ferrari,3 G. Cerullo,1,2 and M. Finazzi2 1IFN-CNR, Piazza L. da Vinci 32, I-20133 Milano, Italy 2Dipartimento di Fisica, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy 3Cambridge Graphene Centre, University of Cambridge, 9 J...
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: Physical Chemistry Chemical Physics
سال: 2017
ISSN: 1463-9076,1463-9084
DOI: 10.1039/c6cp07208a