scholarly journals Effect of an external magnetic field on electron-spin dephasing induced by hyperfine interaction in quantum dots

2003 ◽  
Vol 67 (7) ◽  
Author(s):  
Y. G. Semenov ◽  
K. W. Kim
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
External Magnetic Field ◽  
Hyperfine Interaction ◽  
Electron Spin ◽  
Spin Dephasing

Experimental Evidence of the Hyperfine Interaction between Hole and Nuclear Spins in InAs/GaAs Quantum Dots

2009 ◽  
Vol 1183 ◽  
Author(s):  
Benoit Eble ◽  
Christophe Testelin ◽  
Pascal Desfonds ◽  
Frederic Bernardot ◽  
Andrea Balocchi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
Hyperfine Interaction ◽  
Close Agreement ◽  
Spin Dynamics ◽  
Induced Circular Dichroism ◽  
Nuclear Spins ◽  
Pump Probe ◽  
Dephasing Time ◽  
Spin Dephasing

AbstractThe spin dynamics of resident holes in singly p-doped InAs/GaAs quantum dots is studied by pump-probe photo-induced circular dichroism experiments. We show that the hole spin dephasing is controlled by the hyperfine interaction between the hole spin and nuclear spins. We find a characteristic hole spin dephasing time of 12 ns, in close agreement with our calculations based on a dipole-dipole coupling between the hole and the quantum dot nuclei. Finally we demonstrate that a small external magnetic field, typically 10 mT, quenches the hyperfine hole spin dephasing.

scholarly journals Formation of non-classical optical states in spaser systems under control of an external magnetic field

2019 ◽  
Vol 220 ◽  
pp. 03017
Author(s):  
Mikhail Gubin ◽  
Alexei Prokhorov
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
External Magnetic Field ◽  
Metal Nanoparticles ◽  
Quantum Dynamics ◽  
Semiconductor Quantum Dots ◽  
Exciton Interaction ◽  
Photon States

The work is focused on the investigation of features of quantum dynamics for photons in spaser systems consisting of metal nanoparticles (NP) and semiconductor quantum dots (QDs). The non-classical photon states generation in a three-particle spaser system with nonlinear plasmon-exciton interaction is predicted.

scholarly journals Charge State Control Of Single InAs∕GaAs Quantum Dots By Means Of An External Magnetic Field

2010 ◽  
Author(s):  
L. A. Larsson ◽  
E. S. Moskalenko ◽  
M. Larsson ◽  
P. O. Holtz ◽  
Marília Caldas ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
External Magnetic Field ◽  
Charge State ◽  
State Control

ELECTRON SPIN COHERENCE IN SINGLY CHARGED QUANTUM DOTS

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2813-2825
Author(s):  
D. R. YAKOVLEV ◽  
A. GREILICH ◽  
M. BAYER ◽  
I. A. YUGOVA
Keyword(s):  
Quantum Dots ◽  
Electron Spin ◽  
Zeeman Splitting ◽  
Mode Locking ◽  
Spin Coherence ◽  
Time Resolved ◽  
Pump Probe ◽  
Spin Dephasing ◽  
Rotation Technique ◽  
Singly Charged

Electron spin coherence is examined experimentally and theoretically in singly charged ( In , Ga ) As / GaAs quantum dots. Time-resolved pump-probe Faraday rotation technique is used to examine fine structure and Zeeman splitting of excitons and resident electrons. Spin dephasing and spin coherence times of resident electrons have been measured in the regime of mode-locking of spin coherency.

scholarly journals Thermoelectric coefficients and the figure of merit for large open quantum dots

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Robert Whitney ◽  
Keiji Saito
Keyword(s):  
Magnetic Field ◽  
Quantum Dots ◽  
External Magnetic Field ◽  
Figure Of Merit ◽  
Matrix Theory ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Coherent Transport ◽  
Left And Right ◽  
The Magnetic Field

We consider the thermoelectric response of chaotic or disordered quantum dots in the limit of phase-coherent transport, statistically described by random matrix theory. We calculate the full distribution of the thermoelectric coefficients (Seebeck S and Peltier \PiΠ), and the thermoelectric figure of merit ZT, for large open dots at arbitrary temperature and external magnetic field, when the number of modes in the left and right leads (N_{\rm L} and N_{\rm R}) are large. Our results show that the thermoelectric coefficients and ZT are maximal when the temperature is half the Thouless energy, and the magnetic field is negligible. They remain small, even at their maximum, but they exhibit a type of universality at all temperatures, in which they do not depend on the asymmetry between the left and right leads (N_{\rm L}-N_{\rm R}), even though they depend on (N_{\rm L}+N_{\rm R}).

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