Exciton states and relaxation dynamics in shallow quantum wells

1995 ◽  
Vol 17 (11-12) ◽  
pp. 1493-1498 ◽  
Author(s):  
O. Heller ◽  
J. Tignon ◽  
J. Martinez-Pastor ◽  
Ph. Roussignol ◽  
G. Bastard ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Relaxation Dynamics

High Excitation Effects and Relaxation Dynamics in CdS/ZnSe Single Quantum Wells

2002 ◽  
Vol 229 (2) ◽  
pp. 643-646 ◽  
Author(s):  
M. Schmidt ◽  
H. Priller ◽  
B. Dal Don ◽  
M. Dremel ◽  
M. Gr�n ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Relaxation Dynamics ◽  
Single Quantum ◽  
High Excitation

scholarly journals The ultrafast onset of exciton formation in 2D semiconductors

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Chiara Trovatello ◽  
Florian Katsch ◽  
Nicholas J. Borys ◽  
Malte Selig ◽  
Kaiyuan Yao ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Transition Metal Dichalcogenides ◽  
Single Layer ◽  
Underlying Mechanism ◽  
Relaxation Dynamics ◽  
Electron Hole ◽  
Layer Transition ◽  
Coulombic Interactions ◽  
Formation Dynamics ◽  
Metal Dichalcogenides

Abstract The equilibrium and non-equilibrium optical properties of single-layer transition metal dichalcogenides (TMDs) are determined by strongly bound excitons. Exciton relaxation dynamics in TMDs have been extensively studied by time-domain optical spectroscopies. However, the formation dynamics of excitons following non-resonant photoexcitation of free electron-hole pairs have been challenging to directly probe because of their inherently fast timescales. Here, we use extremely short optical pulses to non-resonantly excite an electron-hole plasma and show the formation of two-dimensional excitons in single-layer MoS2 on the timescale of 30 fs via the induced changes to photo-absorption. These formation dynamics are significantly faster than in conventional 2D quantum wells and are attributed to the intense Coulombic interactions present in 2D TMDs. A theoretical model of a coherent polarization that dephases and relaxes to an incoherent exciton population reproduces the experimental dynamics on the sub-100-fs timescale and sheds light into the underlying mechanism of how the lowest-energy excitons, which are the most important for optoelectronic applications, form from higher-energy excitations. Importantly, a phonon-mediated exciton cascade from higher energy states to the ground excitonic state is found to be the rate-limiting process. These results set an ultimate timescale of the exciton formation in TMDs and elucidate the exceptionally fast physical mechanism behind this process.

Interband and intraband relaxation dynamics in InSb based quantum wells

2016 ◽  
Vol 120 (23) ◽  
pp. 235702 ◽  
Author(s):  
M. Bhowmick ◽  
G. A. Khodaparast ◽  
T. D. Mishima ◽  
M. B. Santos ◽  
D. Saha ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Relaxation Dynamics ◽  
Intraband Relaxation

Carrier relaxation dynamics in annealed and hydrogenated (GaIn)(NAs)∕GaAs quantum wells

2005 ◽  
Vol 87 (25) ◽  
pp. 252111 ◽  
Author(s):  
K. Hantke ◽  
J. D. Heber ◽  
S. Chatterjee ◽  
P. J. Klar ◽  
K. Volz ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Relaxation Dynamics ◽  
Carrier Relaxation ◽  
Carrier Relaxation Dynamics

Exciton relaxation dynamics in ultrathin CdSe/ZnSe single quantum wells

1994 ◽  
Vol 138 (1-4) ◽  
pp. 849-855 ◽  
Author(s):  
U. Neukirch ◽  
D. Weckendrup ◽  
W. Faschinger ◽  
P. Juza ◽  
H. Sitter
Keyword(s):  
Quantum Wells ◽  
Relaxation Dynamics ◽  
Single Quantum

scholarly journals Nontrivial relaxation dynamics of excitons in high-quality InGaAs/GaAs quantum wells

2015 ◽  
Vol 91 (11) ◽  
Author(s):  
A. V. Trifonov ◽  
S. N. Korotan ◽  
A. S. Kurdyubov ◽  
I. Ya. Gerlovin ◽  
I. V. Ignatiev ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Relaxation Dynamics ◽  
High Quality

Subpicosecond spin relaxation dynamics of excitons and free carriers in GaAs quantum wells

1991 ◽  
Vol 67 (24) ◽  
pp. 3432-3435 ◽  
Author(s):  
T. C. Damen ◽  
Luis Via ◽  
J. E. Cunningham ◽  
Jagdeep Shah ◽  
L. J. Sham
Keyword(s):  
Quantum Wells ◽  
Spin Relaxation ◽  
Relaxation Dynamics ◽  
Free Carriers

Exciton spin relaxation dynamics in InGaAs∕InP quantum wells

2004 ◽  
Vol 85 (11) ◽  
pp. 2083-2085 ◽  
Author(s):  
Shunsuke Akasaka ◽  
Shogo Miyata ◽  
Takamasa Kuroda ◽  
Atsushi Tackeuchi
Keyword(s):  
Quantum Wells ◽  
Spin Relaxation ◽  
Relaxation Dynamics
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