scholarly journals Quantum simulation of many-body effects in steady-state nonequilibrium: Electron-phonon coupling in quantum dots

2006 ◽  
Vol 73 (12) ◽  
Author(s):  
J. E. Han
Keyword(s):  
Quantum Dots ◽  
Steady State ◽  
Quantum Simulation ◽  
Phonon Coupling ◽  
Many Body ◽  
Nonequilibrium Electron ◽  
Electron Phonon Coupling ◽  
Many Body Effects

scholarly journals Impact of electron–phonon coupling on electron transport through T-shaped arrangements of quantum dots in the Kondo regime

2021 ◽  
Vol 12 ◽  
pp. 1209-1225
Author(s):  
Patryk Florków ◽  
Stanisław Lipiński
Keyword(s):  
Quantum Dots ◽  
Mean Field ◽  
Strongly Correlated ◽  
Interference Effects ◽  
Phonon Coupling ◽  
Many Body ◽  
Phonon Interaction ◽  
Electron Phonon Interaction ◽  
Kondo Effects ◽  
Electron Phonon Coupling

We calculate the conductance through strongly correlated T-shaped molecular or quantum dot systems under the influence of phonons. The system is modelled by the extended Anderson–Holstein Hamiltonian. The finite-U mean-field slave boson approach is used to study many-body effects. Phonons influence both interference and correlations. Depending on the dot unperturbed energy and the strength of electron–phonon interaction, the system is occupied by a different number of electrons that effectively interact with each other repulsively or attractively. This leads, together with the interference effects, to different spin or charge Fano–Kondo effects.

scholarly journals Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe2

2021 ◽  
Vol 7 (20) ◽  
pp. eabf2810
Author(s):  
Martin R. Otto ◽  
Jan-Hendrik Pöhls ◽  
Laurent P. René de Cotret ◽  
Mark J. Stern ◽  
Mark Sutton ◽  
...  
Keyword(s):  
Wave Vector ◽  
Density Wave ◽  
Phonon Coupling ◽  
Many Body ◽  
Soft Zone ◽  
Electron Phonon Coupling ◽  
Underlying Mechanisms ◽  
The Many ◽  
Coupling Phenomena ◽  
Electron Pocket

The complex coupling between charge carriers and phonons is responsible for diverse phenomena in condensed matter. We apply ultrafast electron diffuse scattering to unravel electron-phonon coupling phenomena in 1T-TiSe2 in both momentum and time. We are able to distinguish effects due to the real part of the many-body bare electronic susceptibility, R[χ0(q)], from those due to the electron-phonon coupling vertex, gq, by following the response of semimetallic (normal-phase) 1T-TiSe2 to the selective photo-doping of carriers into the electron pocket at the Fermi level. Quasi-impulsive and wave vector–specific renormalization of soft zone-boundary phonon frequencies (stiffening) is observed, followed by wave vector–independent electron-phonon equilibration. These results unravel the underlying mechanisms driving the phonon softening that is associated with the charge density wave transition at lower temperatures.

PATH-INTEGRAL APPROACH FOR ELECTRON–PHONON INTERACTION EFFECTS IN HARMONIC QUANTUM DOTS

1996 ◽  
Vol 10 (22) ◽  
pp. 2781-2796 ◽  
Author(s):  
SOMA MUKHOPADHYAY ◽  
ASHOK CHATTERJEE
Keyword(s):  
Quantum Dots ◽  
Path Integral ◽  
State Energy ◽  
Coupling Parameter ◽  
Three Dimensions ◽  
Integral Approach ◽  
Phonon Coupling ◽  
Electron Phonon Interaction ◽  
Electron Phonon Coupling ◽  
Parabolic Confinement

We use the Feynman–Haken path-integral formalism to obtain the polaronic correction to the ground state energy of an electron in a polar semiconductor quantum dot with parabolic confinement in both two and three dimensions. We perform calculations for the entire range of the electron–phonon coupling parameter and for arbitrary confinement length. We apply our results to several semiconductor quantum dots and show that the polaronic effect in some of these dots can be considerably large if the dot sizes are made smaller than a few nanometers.

Low temperature photoluminescence properties of CsPbBr3 quantum dots embedded in glasses

2017 ◽  
Vol 19 (26) ◽  
pp. 17349-17355 ◽  
Author(s):  
Bing Ai ◽  
Chao Liu ◽  
Zhao Deng ◽  
Jing Wang ◽  
Jianjun Han ◽  
...  
Keyword(s):  
Activation Energy ◽  
Quantum Dots ◽  
Thermal Expansion ◽  
Low Temperature ◽  
Size Dependence ◽  
Phonon Coupling ◽  
Photoluminescence Properties ◽  
Electron Phonon Coupling ◽  
Cspbbr3 Quantum Dots ◽  
Low Temperature Photoluminescence

Size dependence of exciton activation energy, electron–phonon coupling strength, and thermal expansion of the bandgap of CsPbBr3 QDs were studied.

scholarly journals Probing biexciton structure in CdSe nanocrystals using 2D optical spectroscopy

2019 ◽  
Vol 205 ◽  
pp. 06020 ◽  
Author(s):  
Hélène Seller ◽  
Samuel Palato ◽  
Patanjali Kambhampati
Keyword(s):  
Quantum Dots ◽  
Optical Spectroscopy ◽  
Semiconductor Nanostructures ◽  
Model System ◽  
Cdse Nanocrystals ◽  
Cdse Quantum Dots ◽  
Many Body ◽  
Many Body Effects

Coherent Multi-dimensional Spectroscopy is ideally suited to investigate many-body effects in semiconductor nanostructures. Here we employ 2D optical spectroscopy on the model system of CdSe quantum dots to reveal the structure of the bandedge biexciton.

Strong electron-phonon coupling regime in self-assembled quantum dots

2004 ◽  
Vol 1 (6) ◽  
pp. 1391-1396 ◽  
Author(s):  
E. Deleporte ◽  
S. Hameau ◽  
J. N. Isaia ◽  
Y. Guldner ◽  
O. Verzelen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Phonon Coupling ◽  
Strong Electron ◽  
Electron Phonon Coupling ◽  
Self Assembled
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