All-electric dual-QPC spin polarizer and analyzer

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 (2e 2 /h) is observed in the absence of external magnetic field indicating spontaneous spin polariza...

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Bibliographic Details
Published in2009 9th IEEE Conference on Nanotechnology (IEEE-NANO) pp. 362 - 363
Main Authors Wan, J., Cahay, M., Debray, P., Newrock, R.S.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2009
Subjects
Electric variables measurement
Electrons
Filters
Green's function methods
Magnetic confinement
Magnetic field measurement
Magnetic fields
Optical polarization
Voltage
Wire
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Summary: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 (2e 2 /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.
ISBN:1424448328
9781424448326
ISSN:1944-9399
1944-9380