scholarly journals Sharp peaks in the conductance of a double quantum dot and a quantum-dot spin valve at high temperatures: A hierarchical quantum master equation approach

2016 ◽  
Vol 94 (12) ◽  
Author(s):  
S. Wenderoth ◽  
J. Bätge ◽  
R. Härtle
Keyword(s):  
Quantum Dot ◽  
Master Equation ◽  
High Temperatures ◽  
Spin Valve ◽  
Quantum Master Equation ◽  
Double Quantum ◽  
Equation Approach ◽  
Double Quantum Dot ◽  
Master Equation Approach

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

scholarly journals Quantum measurement of a solid-state qubit: A unified quantum master equation approach

2004 ◽  
Vol 69 (8) ◽  
Author(s):  
Xin-Qi Li ◽  
Wen-Kai Zhang ◽  
Ping Cui ◽  
Jiushu Shao ◽  
Zhongshui Ma ◽  
...  
Keyword(s):  
Solid State ◽  
Master Equation ◽  
Quantum Measurement ◽  
Quantum Master Equation ◽  
Equation Approach ◽  
Master Equation Approach

EXCITON MIGRATION IN DENDRITIC AGGREGATE SYSTEMS USING THE QUANTUM MASTER EQUATION APPROACH INVOLVING WEAK EXCITON-PHONON COUPLING

2003 ◽  
Vol 02 (03) ◽  
pp. 459-479 ◽  
Author(s):  
MASAHIRO TAKAHATA ◽  
MASAYOSHI NAKANO ◽  
KIZASHI YAMAGUCHI
Keyword(s):  
Master Equation ◽  
Intermolecular Interaction ◽  
Quantum Master Equation ◽  
Migration Behavior ◽  
Equation Approach ◽  
Phonon Coupling ◽  
The Core ◽  
Exciton Migration ◽  
Master Equation Approach ◽  
Exciton Distribution

The quantum master equation approach involving a weak exciton-phonon coupling is applied to the exciton migration dynamics of dendritic molecular aggregates modeled after a phenylacetylene dendrimer, D25, which exhibits an efficient light-harvesting property. The mechanism of efficient exciton migration from the periphery to the core is studied by analyzing relaxation terms among the exciton states originating in weak exciton-phonon coupling. Partial overlaps of exciton distributions between neighboring exciton states are found to be important for realizing the unique migration behavior by step-by-step transfer from the periphery to the core via multi-step exciton states. The same calculation method is applied to the exciton dynamics of a larger dendritic aggregate model, D127, modeled after the largest synthesized phenylacetylene dendrimer D127 in order to examine the dependencies of the exciton migration on the strength of the intermolecular interaction and the temperature of phonon bath. In the case of the relatively weak dipole-dipole coupling, exciton is not observed to migrate efficiently from the periphery to the core, while the largest exciton population is found to remain in the intermediate generations. This is ascribed to the fact that the thermal excitation to the higher exciton states significantly contributes to the exciton distribution in the equilibrium state when the weak intermolecular interaction reduces the energy difference between exciton states. This indicates that the intermolecular interaction is important not only for the overlaps of the exciton distributions between the exciton states, but also the relation between the exciton energy differences and thermal excitations, which spoil the distinct concentration of exciton distribution in the core generation. In the case of a low temperature, even if the intermolecular interaction is weak, the exciton population in the core region is found to be the largest in all the generations. This suggests that exciton tends to efficiently migrate from the periphery to the core when the temperature is sufficiently low. Implications of these theoretical results are discussed in relation to design of magneto-optical materials and other technological applications.

scholarly journals Geometrical pumping in quantum transport: Quantum master equation approach

2012 ◽  
Vol 86 (23) ◽  
Author(s):  
Tatsuro Yuge ◽  
Takahiro Sagawa ◽  
Ayumu Sugita ◽  
Hisao Hayakawa
Keyword(s):  
Master Equation ◽  
Quantum Transport ◽  
Quantum Master Equation ◽  
Equation Approach ◽  
Master Equation Approach

scholarly journals Non-Markovian Dynamics of Geometric Quantum Discord in a Double Quantum Dot System

2021 ◽  
Author(s):  
Arapat Ablimit ◽  
Dildar Hitjan ◽  
Ahmad Abliz
Keyword(s):  
Quantum Dot ◽  
Master Equation ◽  
Quantum Discord ◽  
Bath Temperature ◽  
Diffusion Method ◽  
Double Quantum ◽  
Charge Qubit ◽  
Geometric Quantum Discord ◽  
Double Quantum Dot ◽  
Markovian Dynamics

AbstractIn this paper, we study the geometric quantum discord dynamics of the double quantum dot charge qubit in the non-Markovian environment. We apply the non-perturbative non-Markovian quantum state diffusion method to obtain the exact master equation of the double quantum dot system coupled to two independent non-zero temperature electronic baths. Then, we use this master equation to investigate the effects of non-Markovianity, inter-dot coupling strength and bath temperature on the dynamics of geometric quantum discord. Our studies show that the geometric quantum discord of a double quantum dot system can be modified and enhanced in some cases via these factors.

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