Ganichev, Sergey and Belkov, Vassilij and Tarasenko, Sergey and Danilov, Sergey and Giglberger, Stephan and Hoffmann, Christoph and Ivchenko, Eougenious and Weiss, Dieter and Wegscheider, Werner and Gerl, Christian and Schuh, Dieter and Stahl, Joachim and Boeck, Jo De and Borghs, Gustaaf and Prettl, Wilhelm (2006) Zero-bias spin separation. Nature Physics 2, pp. 609-613.
Download (274kB) - Repository staff only
The generation, manipulation and detection of spin-polarized electrons in low-dimensional semiconductors are at the heart of spintronics. Pure spin currents, that is, fluxes of magnetization without charge current, are quite attractive in this respect. A paradigmatic example is the spin Hall effect, where an electrical current drives a transverse spin current and causes a non-equilibrium spin accumulation observed near the sample boundary1, 2. Here we provide evidence for an another effect causing spin currents which is fundamentally different from the spin Hall effect. In contrast to the spin Hall effect, it does not require an electric current to flow: without bias the spin separation is achieved by spin-dependent scattering of electrons in media with suitable symmetry. We show, by free-carrier absorption of terahertz (THz) radiation, that spin currents flow in a wide range of temperatures. Moreover, the experimental results provide evidence that simple electron gas heating by any means is already sufficient to yield spin separation due to spin-dependent energy-relaxation processes.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||25 Jan 2010 13:17|
|Last Modified:||20 Jul 2011 22:15|