Spin-Dependent Transient Effects in Electron Transport in the Quantum Dot System

• Authors: P. Parafiniuk , R. Taranko
• Languages of publication: EN

Abstracts

EN

We study the effects of the Coulomb interaction U between the electrons of opposite spins localized in the quantum dot on the time-dependent electron transport through the quantum dot coupled with two non-magnetic leads. We calculate the transient spin-dependent current generated by a pulsed bias voltage applied across the quantum dot system via the equation of motion method for appropriate correlation functions. The influence of the Coulomb interaction on the quantum coherent oscillations and beats of the current, spin current and current polarization ratio is studied. Our results indicate that the coherent beats in both the total and spin currents observed in the case of vanishing Coulomb interaction are strongly suppressed by non-zero Coulomb interaction. We also show that in the case of the pulsed bias almost fully polarized current occurs in some time windows for non-vanishing Coulomb interaction contrary to almost pure charge or spin current at vanishing U.

Keywords

EN

72.25.-b; 73.63.Kv; 85.75.-d

Discipline

• 72.25.-b: Spin polarized transport(for spin polarized transport devices, see 85.75.-d)
• 73.63.Kv: Quantum dots
• 85.75.-d: Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields

• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 116
• Issue: 5
• Pages: 844-846

Dates

published

2009-11

Contributors

author

P. Parafiniuk

• Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

R. Taranko

• Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.116.844