All-electric dual-QPC spin polarizer and analyzer

Author

Wan, J. ; Cahay, M. ; Debray, P. ; Newrock, R.S.

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Cincinnati, Cincinnati, OH, USA

fYear

2009

fDate

26-30 July 2009

Firstpage

362

Lastpage

363

Abstract

The ballistic conductance of a device consisting of two quantum point contacts, separated by a distance smaller than the spin coherence length, has been measured at 4.2K. A conductance plateau at 0.5 (2e²/h) is observed in the absence of external magnetic field indicating spontaneous spin polarization. This happens when the confining potentials of the point contacts are made sufficiently asymmetric which results in an asymmetric lateral spin-orbit coupling that leads to spin polarization in the presence of strong electron-electron interaction. Non-equilibrium Green´s function simulation results for a model device strongly support this analysis.

Keywords

Green´s function methods; magnetic fields; quantum point contacts; spin polarised transport; asymmetric lateral spin-orbit coupling; ballistic conductance; electron-electron interaction; external magnetic field; nonequilibrium Green´s function; quantum point contacts; spin analyzer; spin coherence length; spontaneous spin polarization; temperature 4.2 K; Electric variables measurement; Electrons; Filters; Green´s function methods; Magnetic confinement; Magnetic field measurement; Magnetic fields; Optical polarization; Voltage; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology, 2009. IEEE-NANO 2009. 9th IEEE Conference on

Conference_Location

Genoa

ISSN

1944-9399

Print_ISBN

978-1-4244-4832-6

Electronic_ISBN

1944-9399

Type

conf

Filename

5394640