scholarly journals Accelerating scientific discovery through computation and visualization - III. Tight-binding wave functions for quantum dots

2008 ◽  
Vol 113 (3) ◽  
pp. 131 ◽  
Author(s):  
James S. Sims ◽  
William L. George ◽  
Terence J. Griffin ◽  
John C. Hagedorn ◽  
Howard K. Hung ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Scientific Discovery ◽  
Tight Binding ◽  
Wave Functions

scholarly journals Electron-hole correlations in semiconductor quantum dots with tight-binding wave functions

2001 ◽  
Vol 63 (19) ◽  
Author(s):  
Seungwon Lee ◽  
Lars Jönsson ◽  
John W. Wilkins ◽  
Garnett W. Bryant ◽  
Gerhard Klimeck
Keyword(s):  
Quantum Dots ◽  
Tight Binding ◽  
Semiconductor Quantum Dots ◽  
Wave Functions ◽  
Electron Hole

Magnetotunneling spectroscopy imaging of electron wave functions in self-assembled InAs quantum dots

2001 ◽  
Vol 171 (12) ◽  
pp. 1365
Author(s):  
E.E. Vdovin ◽  
Yu.N. Khanin ◽  
Yu.V. Dubrovskii ◽  
A. Veretennikov ◽  
A. Levin ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Wave Functions ◽  
Electron Wave ◽  
Inas Quantum Dots ◽  
Self Assembled

Communication: Photoinduced Carbon Dioxide Binding with Surface-Functionalized Silicon Quantum Dots

2018 ◽  
Author(s):  
Oscar A. Douglas-Gallardo ◽  
Cristián Gabriel Sánchez ◽  
Esteban Vöhringer-Martinez
Keyword(s):  
Carbon Dioxide ◽  
Quantum Dots ◽  
Atmospheric Carbon Dioxide ◽  
Density Functional ◽  
Tight Binding ◽  
Carbon Dioxide Concentration ◽  
Research Area ◽  
Silicon Quantum Dots ◽  
Dependent Model ◽  
Photoinduced Charge

<div> <div> <div> <p>Nowadays, the search of efficient methods able to reduce the high atmospheric carbon dioxide concentration has turned into a very dynamic research area. Several environmental problems have been closely associated with the high atmospheric level of this greenhouse gas. Here, a novel system based on the use of surface-functionalized silicon quantum dots (sf -SiQDs) is theoretically proposed as a versatile device to bind carbon dioxide. Within this approach, carbon dioxide trapping is modulated by a photoinduced charge redistribution between the capping molecule and the silicon quantum dots (SiQDs). Chemical and electronic properties of the proposed SiQDs have been studied with Density Functional Theory (DFT) and Density Functional Tight-Binding (DFTB) approach along with a Time-Dependent model based on the DFTB (TD-DFTB) framework. To the best of our knowledge, this is the first report that proposes and explores the potential application of a versatile and friendly device based on the use of sf -SiQDs for photochemically activated carbon dioxide fixation. </p> </div> </div> </div>

Electromechanical field effects in InAs/GaAs quantum dots based on continuum k→·p→ and atomistic tight-binding methods

2021 ◽  
Vol 197 ◽  
pp. 110678
Author(s):  
Daniele Barettin ◽  
Alessandro Pecchia ◽  
Matthias Auf der Maur ◽  
Aldo Di Carlo ◽  
Benny Lassen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Tight Binding ◽  
Field Effects ◽  
Electromechanical Field

Intermixing during growth of InAs self-assembled quantum dots in InP: A photoluminescence and tight-binding investigation

2008 ◽  
Vol 77 (7) ◽  
Author(s):  
C. Dion ◽  
P. Desjardins ◽  
N. Shtinkov ◽  
M. D. Robertson ◽  
F. Schiettekatte ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Tight Binding ◽  
Self Assembled

Optical Properties of Cds Quantum Dots: The Key Role of the Spin-Orbit and Coulomb Interactions

1999 ◽  
Vol 571 ◽  
Author(s):  
M. Chamarro ◽  
V. Voliotis ◽  
M. Dib ◽  
T. Gacoin ◽  
C. Delerue ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Tight Binding ◽  
Spin Orbit ◽  
Coulomb Interactions ◽  
Electron Hole ◽  
Small Quantum ◽  
Cds Quantum Dot ◽  
Growth Method ◽  
Order Of Magnitude

ABSTRACTWe study theoretically and experimentally the effects of the Coulomb and the spin-orbit coupling on the electronic structure of small quantum dots. A tight-binding calculation with restricted configuration interaction is developed in a typical case: very small cubic quantum dots for which the electron-hole exchange interaction is of the order of magnitude of the spinorbit interaction. Experimentally, resonant photoluminescence and photoluminescence excitation are used to obtain information on a single size of CdS quantum dot obtained by a chemical growth method.

scholarly journals RPA APPROACH TO NON-LINEAR TRANSPORT IN QUANTUM DOTS

2009 ◽  
Vol 23 (20n21) ◽  
pp. 4414-4421
Author(s):  
B. TANATAR ◽  
V. MOLDOVEANU
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Random Phase ◽  
Tight Binding ◽  
Polarization Operator ◽  
Approximation Schemes ◽  
Theoretical Treatment ◽  
Gw Approximation ◽  
Linear Transport ◽  
Non Linear

An accurate theoretical treatment of electron-electron interactions in mesoscopic systems is available in very few cases and approximation schemes are developed in most of the applications, especially for many-level quantum dots. Here we present transport calculations within the random-phase approximation for the Coulomb interaction using the Keldysh Green's functions formalism. We describe the quantum dot systems by a tight-binding Hamiltonian. Our method is similar to the one used by Faleev and Stockman [Phys. Rev. B 66 085318 (2002)] in their study of the equilibrium properties of a homogeneous 2D electron gas. The important extension at the formal level is that we combine the RPA and the Keldysh formalism for studying non-linear transport properties of open quantum dots. Within the Keldysh formalism the polarization operator becomes a contour-ordered quantity that should be computed either from the non-interacting Green functions of the coupled quantum dot (the so-called G0W approximation) either self-consistently (GW approximation). We performed both non-selfconsistent and self-consistent calculations and compare the results. In particular we recover the Coulomb diamonds for interacting quantum dots and we discuss the charge sensing effects in parallel quantum dots.

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