Exciton dynamics in WSe2 bilayers

G. Wang; X. Marie; L. Bouet; M. Vidal; A. Balocchi; T. Amand; D. Lagarde; B. Urbaszek

doi:10.1063/1.4900945

Exciton dynamics in WSe₂ bilayers

G. Wang^*
, X. Marie
, L. Bouet
, M. Vidal
, A. Balocchi
, T. Amand
, D. Lagarde
, B. Urbaszek

^*Corresponding author for this work

Université de Toulouse

Research output: Contribution to journal › Article › peer-review

52 Citations (Scopus)

Abstract

We investigate exciton dynamics in WSe₂ bilayers in time-resolved photoluminescence (PL) spectroscopy. Fast PL emission times are recorded for both the direct exciton with τ _D ≲3 ps and the indirect optical transition with τ _I≈25 ps. For temperatures between 4 to 150 K τ _I remains constant. Following polarized laser excitation, we observe for the direct exciton transition at the K point of the Brillouin zone efficient optical orientation and alignment during the short emission time τ _D. The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments.

Original language	English
Article number	182105
Journal	Applied Physics Letters
Volume	105
Issue number	18
DOIs	https://doi.org/10.1063/1.4900945
Publication status	Published - 3 Nov 2014
Externally published	Yes

Access to Document

10.1063/1.4900945

Cite this

@article{390891709081452d9d409f86ddfc8351,

title = "Exciton dynamics in WSe2 bilayers",

abstract = "We investigate exciton dynamics in WSe2 bilayers in time-resolved photoluminescence (PL) spectroscopy. Fast PL emission times are recorded for both the direct exciton with τ D ≲3 ps and the indirect optical transition with τ I≈25 ps. For temperatures between 4 to 150 K τ I remains constant. Following polarized laser excitation, we observe for the direct exciton transition at the K point of the Brillouin zone efficient optical orientation and alignment during the short emission time τ D. The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments.",

author = "G. Wang and X. Marie and L. Bouet and M. Vidal and A. Balocchi and T. Amand and D. Lagarde and B. Urbaszek",

note = "Publisher Copyright: {\textcopyright} 2014 AIP Publishing LLC.",

year = "2014",

month = nov,

day = "3",

doi = "10.1063/1.4900945",

language = "English",

volume = "105",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "18",

}

TY - JOUR

T1 - Exciton dynamics in WSe2 bilayers

AU - Wang, G.

AU - Marie, X.

AU - Bouet, L.

AU - Vidal, M.

AU - Balocchi, A.

AU - Amand, T.

AU - Lagarde, D.

AU - Urbaszek, B.

PY - 2014/11/3

Y1 - 2014/11/3

N2 - We investigate exciton dynamics in WSe2 bilayers in time-resolved photoluminescence (PL) spectroscopy. Fast PL emission times are recorded for both the direct exciton with τ D ≲3 ps and the indirect optical transition with τ I≈25 ps. For temperatures between 4 to 150 K τ I remains constant. Following polarized laser excitation, we observe for the direct exciton transition at the K point of the Brillouin zone efficient optical orientation and alignment during the short emission time τ D. The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments.

AB - We investigate exciton dynamics in WSe2 bilayers in time-resolved photoluminescence (PL) spectroscopy. Fast PL emission times are recorded for both the direct exciton with τ D ≲3 ps and the indirect optical transition with τ I≈25 ps. For temperatures between 4 to 150 K τ I remains constant. Following polarized laser excitation, we observe for the direct exciton transition at the K point of the Brillouin zone efficient optical orientation and alignment during the short emission time τ D. The evolution of the direct exciton polarization and intensity as a function of excitation laser energy is monitored in PL excitation experiments.

UR - https://www.scopus.com/pages/publications/84908577823

U2 - 10.1063/1.4900945

DO - 10.1063/1.4900945

M3 - Article

AN - SCOPUS:84908577823

SN - 0003-6951

VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 18

M1 - 182105

ER -

Exciton dynamics in WSe₂ bilayers

Abstract

Access to Document

Other files and links

Fingerprint

Cite this