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New functional devices utilizing spin degrees of freedom

The electron charge flow in conventional electronic devices has been used to express "0" and "1". Instead, the electron spin direction is used in the spin-based devices.

Research Topics

Photoluminescence spectroscopy of nonlinear- and linear-screening regimes in a low-density two-dimensional electron system
A high-quality low-density two-dimensional electron system (2DES) in semiconductors can be formed on gated undoped GaAs quantum wells (QWs) grown by molecular beam epitaxy. Some interesting phenomena, such as Wigner crystallization, are predicted to appear in low-density 2DES theoretically because the large Coulomb interaction between electrons plays a role.…
In0.75Ga0.25As Quantum Point Contacts Utilizing Wrap-Gate Geometry
In this study, we improved fabrication technique for QPCs in an InGaAs/InAlAs two-dimensional electron gas heterostructure. The key challenge in realizing a well-behaved QPC is efficient electrostatic control of a one-dimensional channel using the gate electrode. …
Kondo Effect in a Semiconductor Quantum Dot Controlled by Spin Accumulation
We study the Kondo effect in a semiconductor quantum dot in contact with a spin-accumulated lead. The spin accumulation in a nonmagnetic semiconductor is realized by spin injection from a spin-polarized quantum point contact in combination with magnetic focusing, thus creating spin-unbalanced chemical potentials.…
Evaluation of spin polarization in p-In0.96Mn0.04As using Andreev reflection spectroscopy including inverse proximity effect
In superconductor/ferromagnet (S-F) junctions, new quantum phenomena can be expected from the interplay between the superconductivity and the spin polarization of the ferromagnet. …
Spin Control by Electric Field
We have experimentally confirmed that the spin-orbit interaction in a semiconductor 2DEG channel can be controlled by a gate voltage. This is the first step towards the creation of functional spin devices such as a spin field effect transistor, a spin filter, and a spin interference device.…

What's New

  1. March 1st, 2012, Spintronics research group web site is updated.