Spin-polarized electric currents in diluted magnetic semiconductor heterostructures induced by terahertz and microwave radiation

Engineering ultrafast spin currents and terahertz transients by magnetic heterostructures

1. Department of Physical Chemistry, Fritz Haber Institute, Berlin, Germany. 2. Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden. 3. I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany. 4. Helmholtz-Zentrum Berlin fϋr Materialien und Energie, Berlin, Germany. 5. Peter Grünberg Institute and Institute for Advanced Simulation, Forschungszentr...

Spin currents in diluted magnetic semiconductors.

We study zero-bias spin separation in (Cd,Mn)Te/(Cd,Mg)Te diluted magnetic semiconductor structures. The spin current generated by electron gas heating under terahertz radiation is converted into a net electric current by applying an external magnetic field. The experiments show that the spin polarization of the magnetic ion system enhances drastically the conversion process due to giant Zeeman...

Spin polarized transport in 1D and 2D semiconductor heterostructures

The high electron mobility spin transistor comprises a 1D or 2D electron gas, obtained from III-V semiconductor heterostructure, with ferromagnetic source and drain contacts. The latter act respectively as a polarizer and as an analyzer for the spin of the electrons, and the gate potential is used to control the spin precession in the channel. After reviewing the main spin dephasing effects exi...

Terahertz radiation from magnetic excitations in diluted magnetic semiconductors.

We probed, in the time domain, the THz electromagnetic radiation originating from spins in CdMnTe diluted magnetic semiconductor quantum wells containing high-mobility electron gas. Taking advantage of the efficient Raman generation process, the spin precession was induced by low power near-infrared pulses. We provide a full theoretical first-principles description of spin-wave generation, spin...

Periodic magnetic structures generated by spin–polarized currents in nanostripes