Asymmetry effect on the spin relaxation in quantum dot structures

2009 ◽  
Vol 6 (4) ◽  
pp. 833-836
Author(s):  
A. F. Zinovieva ◽  
A. V. Dvurechenskii ◽  
N. P. Stepina ◽  
A. S. Deryabin ◽  
A. I. Nikiforov ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Asymmetry Effect

scholarly journals Fundamental limits of electron and nuclear spin qubit lifetimes in an isolated self-assembled quantum dot

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
George Gillard ◽  
Ian M. Griffiths ◽  
Gautham Ragunathan ◽  
Ata Ulhaq ◽  
Callum McEwan ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Operating Conditions ◽  
External Control ◽  
Spin Qubits ◽  
Fundamental Limits ◽  
Trade Offs ◽  
Wide Range ◽  
Spin Qubit

AbstractCombining external control with long spin lifetime and coherence is a key challenge for solid state spin qubits. Tunnel coupling with electron Fermi reservoir provides robust charge state control in semiconductor quantum dots, but results in undesired relaxation of electron and nuclear spins through mechanisms that lack complete understanding. Here, we unravel the contributions of tunnelling-assisted and phonon-assisted spin relaxation mechanisms by systematically adjusting the tunnelling coupling in a wide range, including the limit of an isolated quantum dot. These experiments reveal fundamental limits and trade-offs of quantum dot spin dynamics: while reduced tunnelling can be used to achieve electron spin qubit lifetimes exceeding 1 s, the optical spin initialisation fidelity is reduced below 80%, limited by Auger recombination. Comprehensive understanding of electron-nuclear spin relaxation attained here provides a roadmap for design of the optimal operating conditions in quantum dot spin qubits.

Spin relaxation length in quantum dot spin LEDs

2013 ◽  
Vol 10 (9) ◽  
pp. 1214-1217 ◽  
Author(s):  
Henning Höpfner ◽  
Carola Fritsche ◽  
Arne Ludwig ◽  
Astrid Ludwig ◽  
Frank Stromberg ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Relaxation Length

scholarly journals Giant Anisotropy of Spin Relaxation and Spin-Valley Mixing in a Silicon Quantum Dot

2020 ◽  
Vol 124 (25) ◽  
Author(s):  
Xin Zhang ◽  
Rui-Zi Hu ◽  
Hai-Ou Li ◽  
Fang-Ming Jing ◽  
Yuan Zhou ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Silicon Quantum Dot

scholarly journals Spin relaxation in a two-electron quantum dot

JETP Letters ◽  
2003 ◽  
Vol 77 (1) ◽  
pp. 30-33 ◽  
Author(s):  
S. Dickmann ◽  
P. Hawrylak
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Electron Quantum

Direct measurements of spin relaxation times of electrons in tunnel-coupled Ge/Si quantum dot arrays

2010 ◽  
Vol 81 (11) ◽  
Author(s):  
A. F. Zinovieva ◽  
A. V. Dvurechenskii ◽  
N. P. Stepina ◽  
A. I. Nikiforov ◽  
A. S. Lyubin ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Relaxation Times ◽  
Si Quantum Dot ◽  
Direct Measurements
Sign in / Sign up

Export Citation Format

Share Document