Dynamic nuclear polarization induced by hot electrons | Zendy

Yosuke Komori | Zendy; T. Okamoto | Zendy

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Dynamic nuclear polarization induced by hot electrons

Author(s) -

Yosuke Komori,

T. Okamoto

Publication year - 2007

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.2431779

Subject(s) - condensed matter physics , electron , polarization (electrochemistry) , spins , electron cooling , magnetic field , heterojunction , liquid helium , materials science , atomic physics , helium , physics , chemistry , nuclear physics , quantum mechanics

A new method for local dynamic nuclear polarization is demonstrated in aGaAs/AlGaAs heterostructure at the Landau level filling factor $\nu=3$. Using anarrow channel sample, where the width varies stepwise along the electron flow,we find that electron cooling (heating) causes the polarization of nuclearspins against (toward) the external magnetic field at liquid heliumtemperatures. The longitudinal nuclear spin relaxation rate variesexponentially with inverse temperature.Comment: 3 pages, 3 figure

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