Spin filtration of unpolarized electrons by impurity centers in semiconductors

Journal Article · Tue Nov 15 00:00:00 EST 2011 · Semiconductors

DOI:https://doi.org/10.1134/S1063782611110066· OSTI ID:22004704

Bobin, E G

It is shown that unpolarized paramagnetic centers can implement the spin filtration of unpolarized conduction electrons in semiconductors. This ability of paramagnetic centers is caused by the difference in the spin evolution of the states of electron-paramagnetic-center pairs and by the spin selectivity of electron capture exclusively from singlet pairs. The electron spin polarization should be opposite to the paramagneticcenter polarization. To implement spin filtration, an external magnetic field is necessary. The polarization can attain the largest values ({approx}10%) if the probability of spin-selective electron capture from singlet pairs exceeds the pair-decay rate by a factor of 5-7.

• OSTI ID: 22004704
• Journal Information: Semiconductors, Vol. 45, Issue 11; Other Information: Copyright (c) 2011 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ELECTRON CAPTURE
ELECTRONS
FILTRATION
IMPURITIES
MAGNETIC FIELDS
PARAMAGNETISM
POLARIZATION
SEMICONDUCTOR MATERIALS
SPIN
SPIN ORIENTATION