Spin dynamics in a double quantum dot: Exact diagonalization study

2008 ◽  
Vol 77 (24) ◽  
Author(s):  
J. Särkkä ◽  
A. Harju
Keyword(s):  
Quantum Dot ◽  
Spin Dynamics ◽  
Exact Diagonalization ◽  
Double Quantum ◽  
Double Quantum Dot

scholarly journals Steady-State Entanglement in the Nuclear Spin Dynamics of a Double Quantum Dot

2013 ◽  
Vol 111 (24) ◽  
Author(s):  
M. J. A. Schuetz ◽  
E. M. Kessler ◽  
L. M. K. Vandersypen ◽  
J. I. Cirac ◽  
G. Giedke
Keyword(s):  
Steady State ◽  
Quantum Dot ◽  
Nuclear Spin ◽  
Spin Dynamics ◽  
Double Quantum ◽  
Double Quantum Dot

Josephson phase transition modified by the super-strong Coulomb interaction

2018 ◽  
Vol 32 (18) ◽  
pp. 1850203
Author(s):  
Xiao-Qi Wang ◽  
Cui Jiang ◽  
Guang-Yu Yi
Keyword(s):  
Phase Transition ◽  
Quantum Dot ◽  
Josephson Junction ◽  
Coulomb Interaction ◽  
Exact Diagonalization ◽  
Double Quantum ◽  
Two Phase ◽  
Double Quantum Dot ◽  
Strong Coulomb

With the help of the exact diagonalization approach, the Josephson phase transition in a T-shaped double quantum-dot (QD) junction is theoretically investigated. It is found that when the intradot Coulomb interaction in one dot is super-strong, new Josephson phase-transition manner comes into being, in comparison with the case of two identical dots. Besides, owing to the different positions of the two dots, the super-strong Coulomb repulsions in them induce two phase-transition results, respectively. We believe that this work can be helpful in understanding how the super-strong Coulomb interaction influences the phase transition in the Josephson junction with embedded dots.

scholarly journals Phonon-assisted relaxation between triplet and singlet states in a self-assembled double quantum dot

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Krzysztof Gawarecki ◽  
Paweł Machnikowski
Keyword(s):  
Quantum Dot ◽  
Spin Dynamics ◽  
Double Quantum ◽  
Double Quantum Dot ◽  
Model Combining ◽  
Singlet States ◽  
Spin Singlet ◽  
Electric And Magnetic Fields ◽  
Self Assembled ◽  
Interaction Approach

AbstractWe study theoretically phonon-induced spin dynamics of two electrons confined in a self-assembled double quantum dot. We calculate the transition rates and time evolution of occupations for the spin-triplet and spin-singlet states. We characterize the relative importance of various relaxation channels, including two-phonon processes, as a function of the electric and magnetic fields. The simulations are based on a model combining the eight-band $$\varvec{k}\!\cdot \!\varvec{p}$$ k · p method and configuration-interaction approach. We show that the electron g-factor mismatch between the Zeeman doublets localized on different dots opens a relatively fast triplet-singlet phonon-assisted relaxation channel. We also demonstrate, that the relaxation near the triplet-singlet anticrossing is slowed down up to several orders of magnitude due to vanishing of some relaxation channels.

scholarly journals Large Voltage-Tunable Spin Valve Based on a Double Quantum Dot

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Patrycja Tulewicz ◽  
Kacper Wrześniewski ◽  
Szabolcs Csonka ◽  
Ireneusz Weymann
Keyword(s):  
Quantum Dot ◽  
Spin Valve ◽  
Double Quantum ◽  
Double Quantum Dot
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