Journal ArticleDOI
Electronic analog of the electro‐optic modulator
Supriyo Datta,Biswajit Das +1 more
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TLDR
In this article, an electron wave analog of the electro-optic light modulator is proposed, where magnetized contacts are used to preferentially inject and detect specific spin orientations.Abstract:
We propose an electron wave analog of the electro‐optic light modulator. The current modulation in the proposed structure arises from spin precession due to the spin‐orbit coupling in narrow‐gap semiconductors, while magnetized contacts are used to preferentially inject and detect specific spin orientations. This structure may exhibit significant current modulation despite multiple modes, elevated temperatures, or a large applied bias.read more
Citations
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Journal ArticleDOI
Coherent wave-packet evolution in coupled bands
TL;DR: In this paper, a formalism for coherent wave-packet dynamics of charge and spin carriers in degenerate and nearly degenerate bands was developed for spintronics applications, where transitions between spin-split bands often occur even for relatively weak electromagnetic fields.
Journal ArticleDOI
Spin current through a quantum dot in the presence of an oscillating magnetic field.
TL;DR: The Kondo-type cotunneling contribution is manifested by a large enhancement of the pumped spin current in the strong coupling low temperature regime.
Journal ArticleDOI
Quantum spin/valley Hall effect and topological insulator phase transitions in silicene
TL;DR: In this article, a theoretical realization of quantum spin and quantum valley Hall effects in silicene is presented, where the authors show that combination of an electric field and intrinsic spin-orbit interaction leads to quantum phase transitions at the charge neutrality point.
Proceedings Article
Silicon spintronics
TL;DR: In this paper, the Haynes-Shockley experiment was used to measure minority-carrier transport parameters in semiconductors, and a four-terminal device was used for spin transport measurements.
Journal ArticleDOI
A resonant spin lifetime transistor
TL;DR: In this article, a spintronic transistor based on the spin relaxation properties of a two-dimensional electron gas (2DEG) was proposed, which works in the diffusive regime rather than in the ballistic regime.
References
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Journal ArticleDOI
Oscillatory effects and the magnetic susceptibility of carriers in inversion layers
TL;DR: In this paper, the spin-orbit interaction Hamiltonian HSO = alpha ( sigma *k) was used to change the usual patterns of B-1-periodic oscillations; some oscillations are strongly suppressed due to the diminishing of the gaps between adjacent levels and new oscillations appear due to intersections of levels.
Journal ArticleDOI
Coupling of electronic charge and spin at a ferromagnetic-paramagnetic metal interface.
Mark Johnson,Robert H. Silsbee +1 more
TL;DR: A new technique to measure conduction electron relaxation times is described, using nonequilibrium magnetization present in a paramagnetic metal can be detected as an open circuit voltage across an interface between the paramagnet and a ferromagnet.
Journal ArticleDOI
Spin splitting in semiconductor heterostructures for B-->0.
TL;DR: This work shows for AlGaAs/GaAs heterostructures how this finite spin splitting at B=0 evolves from the Zeeman splitting for B\ensuremath{
e}0 and predicts a vanishingspin splitting at a finite -magnetic- field \char22{}, which depends on the electron concentration in the inversion layer.
Journal ArticleDOI
On the possibility of transistor action based on quantum interference phenomena
TL;DR: In this article, a theoretical study of quantum interference phenomena in a T-shaped semiconductor structure is presented, and the results resemble the well-known solutions for the electromagnetic field in waveguides with the main difference that penetration of the wave function of the electrons can be controlled by external voltages.
Journal ArticleDOI
Evidence for spin splitting in In x Ga 1-x As/In 0.52 Al 0.48 As heterostructures as B-->0
Biswajit Das,D. C. Miller,Supriyo Datta,Ronald G. Reifenberger,W. P. Hong,P. K. Bhattacharya,Jasprit Singh,M. Jaffe +7 more
TL;DR: In this paper, the splitting in zero magnetic field between the up-and down-spin electrons in a two-dimensional electron gas is obtained for a series of three different modulation-doped heterostructures with high electron densities.