منابع مشابه
Generation of spin current by Coulomb drag.
Coulomb drag between two quantum wires is exponentially sensitive to the mismatch of their electronic densities. The application of a magnetic field can compensate this mismatch for electrons of opposite spin directions in different wires. The resulting enhanced momentum transfer leads to the conversion of the charge current in the active wire to the spin current in the passive wire.
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In this review, we describe in detail two important spin-transport phenomena: the extrinsic spin-Hall effect (coming from spin-orbit interactions between electrons and impurities) and the spin-Coulomb drag. The interplay of these two phenomena is analyzed. In particular, we discuss the influence of scattering between electrons with opposite spins on the spin current and the spin accumulation pr...
متن کاملObserving the spin Coulomb drag in spin-valve devices
The Coulomb interaction between electrons of opposite spin orientations in a metal or in a doped semiconductor results in a negative off-diagonal component of the electrical resistivity matrix—the so-called “spindrag resistivity.” It is generally quite difficult to separate the spin-drag contribution from more conventional mechanisms of resistivity. In this paper I discuss two methods to accomp...
متن کاملSpin Coulomb drag in the two-dimensional electron liquid
We calculate the spin-drag transresistivity ρ↑↓(T ) in a two-dimensional electron gas at temperature T in the random phase approximation. In the lowtemperature regime we show that, at variance with the three-dimensional low-temperature result [ρ↑↓(T ) ∼ T 2], the spin transresistivity of a twodimensional spin unpolarized electron gas has the form ρ↑↓(T ) ∼ T 2 lnT . In the spin-polarized case t...
متن کاملCoulomb drag in quantum circuits.
We study the drag effect in a system of two electrically isolated quantum point contacts, coupled by Coulomb interactions. Drag current exhibits maxima as a function of quantum point contacts gate voltages when the latter are tuned to the transitions between quantized conductance plateaus. In the linear regime this behavior is due to enhanced electron-hole asymmetry near an opening of a new con...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 2006
ISSN: 0031-9007,1079-7114
DOI: 10.1103/physrevlett.97.246803