scholarly journals Dark-level trapping, lateral confinement, and built-in electric field contributions to the carrier dynamics in c-plane GaN/AlN quantum dots emitting in the UV range

2021 ◽  
Vol 129 (5) ◽  
pp. 054301
Author(s):  
M. Hrytsaienko ◽  
M. Gallart ◽  
M. Ziegler ◽  
O. Crégut ◽  
S. Tamariz ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Carrier Dynamics ◽  
Lateral Confinement ◽  
Uv Range

BINDING ENERGIES OF HYDROGENIC IMPURITIES ON-CENTER AND OFF-CENTER IN CYLINDRICAL QUANTUM DOTS UNDER ELECTRIC AND MAGNETIC FIELDS

2010 ◽  
Vol 24 (22) ◽  
pp. 4293-4304 ◽  
Author(s):  
SHENG WANG ◽  
GUOZHU WEI ◽  
GUANGYU YI
Keyword(s):  
Quantum Dots ◽  
Binding Energy ◽  
Magnetic Fields ◽  
Electric Field ◽  
Electric Fields ◽  
Effective Radius ◽  
Binding Energies ◽  
Hydrogenic Impurity ◽  
Lateral Confinement ◽  
Electric And Magnetic Fields

The ground-state binding energies of a hydrogenic impurity in cylindrical quantum dots (QDs) subjected to external electric and magnetic fields are investigated using the finite-difference method within the quasi-one-dimensional effective potential model. The QD is modeled by superposing a square-well potential and a strong lateral confinement potential by the combination of a parabolic potential and a changeable magnetic field. We define an effective radius of a cylindrical QD which can describe the strength of the lateral confinement. The effects of the electric fields are less important when the effective radius is very tiny, and the effects are manifested as the effective radius increases. Meanwhile, one finds that the binding energies highly depend on the impurity positions under the applied transverse fields. When the impurity is located at the right half of the cylinder, the electric field pushes the electron to the left side, then the binding energy decreases; when the impurity is located at the left, the binding energy first increases and reaches a peak value, then deceases with the electric field.

High-performance near-infrared photodetectors based on C3N quantum dots integrated with single-crystal graphene

2021 ◽  
Author(s):  
Yun Zhao ◽  
Xiaoqiang Feng ◽  
Menghan Zhao ◽  
Xiaohu Zheng ◽  
Zhiduo Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Single Crystal ◽  
High Performance ◽  
Near Infrared ◽  
Fast Response ◽  
Local Electric Field ◽  
Infrared Photodetectors ◽  
Photocurrent Response

Employing C3N QD-integrated single-crystal graphene, photodetectors exhibited a distinct photocurrent response at 1550 nm. The photocurrent map revealed that the fast response derive from C3N QDs that enhanced the local electric field near graphene.

Carrier dynamics in p-type InGaAs/GaAs quantum dots

2007 ◽  
Vol 18 (S1) ◽  
pp. 363-365 ◽  
Author(s):  
X. M. Wen ◽  
L. V. Dao ◽  
J. A. Davis ◽  
P. Hannaford ◽  
S. Mokkapati ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carrier Dynamics ◽  
P Type

Carrier dynamics of type-II InAs∕GaAs quantum dots covered by a thin GaAs1−xSbx layer

2008 ◽  
Vol 93 (3) ◽  
pp. 033107 ◽  
Author(s):  
Wen-Hao Chang ◽  
Yu-An Liao ◽  
Wei-Ting Hsu ◽  
Ming-Chih Lee ◽  
Pei-Chin Chiu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carrier Dynamics ◽  
Type Ii

Few-Particle Effects in Nonlinear Optical Spectra of Semiconductor Quantum Dots

1999 ◽  
Vol 571 ◽  
Author(s):  
Ulrich Hohenesteri ◽  
Fausto Rossi ◽  
Elisa Molinari
Keyword(s):  
Quantum Dots ◽  
Density Matrix ◽  
Nonlinear Optical ◽  
Coherent Control ◽  
Optical Spectra ◽  
Carrier Dynamics ◽  
Semiconductor Quantum Dots ◽  
Nonequilibrium Carrier ◽  
Optical Nonlinearities ◽  
Matrix Approach

ABSTRACTWe present a density-matrix approach for the description of nonequilibrium carrier dynamics in optically excited semiconductor quantum dots, that explicitly accounts for exciton-exciton as well as exciton-carrier interactions. Within this framework, we analyze few-particle effects in the optical spectra and provide a consistent description of additional peaks appearing at high photoexcitation density. We discuss possible applications of such optical nonlinearities in future coherent-control experiments.

ChemInform Abstract: Electric-Field Controlled Ferromagnetism in MnGe Magnetic Quantum Dots

ChemInform ◽  
2011 ◽  
Vol 43 (1) ◽  
pp. no-no
Author(s):  
Faxian Xiu ◽  
Yong Wang ◽  
Jin Zou ◽  
Kang L. Wang
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Magnetic Quantum Dots

Influence of electric field on the properties of the polymer stabilized luminescent quantum dots in aqueous solutions

2016 ◽  
Vol 176 ◽  
pp. 65-70 ◽  
Author(s):  
Irina S. Zharkova ◽  
Natalia E. Markina ◽  
Alexey V. Markin ◽  
Daniil D. Drozd ◽  
Elena S. Speranskaya ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Aqueous Solutions ◽  
Polymer Stabilized ◽  
Luminescent Quantum Dots

Solvent-induced luminescence charge carrier dynamics for ZnO quantum dots

2021 ◽  
pp. 130469
Author(s):  
M. Kumar ◽  
A.H. Makki ◽  
B.P. Reddy ◽  
K.-S. Seong ◽  
S.-H. Park
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics ◽  
Zno Quantum Dots
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