We introduce and experimentally demonstrate a new method that allows us to controllably couple copropagating spin-resolved edge states of a two-dimensional electron gas (2DEG) in the integer quantum Hall regime. The scheme exploits a spatially periodic in-plane magnetic field that is created by an array of Cobalt nanomagnets placed at the boundary of the 2DEG. A maximum charge or spin transfer of 28±1% is achieved at 250 mK.
Controlled coupling of spin-resolved quantum Hall edge states / KARMAKAR B; VENTURELLI D; CHIROLLI L; TADDEI F; GIOVANNETTI V; FAZIO R; RODDARO S; BIASIOL G; SORBA L; PELLEGRINI V; BELTRAM F. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - ELETTRONICO. - 107:(2011), pp. 236804-236807. [10.1103/PhysRevLett.107.236804]
Controlled coupling of spin-resolved quantum Hall edge states
CHIROLLI L;
2011
Abstract
We introduce and experimentally demonstrate a new method that allows us to controllably couple copropagating spin-resolved edge states of a two-dimensional electron gas (2DEG) in the integer quantum Hall regime. The scheme exploits a spatially periodic in-plane magnetic field that is created by an array of Cobalt nanomagnets placed at the boundary of the 2DEG. A maximum charge or spin transfer of 28±1% is achieved at 250 mK.
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