Electrical read-out of the local nuclear polarization in the quantum Hall effect

Details Electrical read-out of the local nuclear polarization in the quantum Hall effect Electrical read-out of the local nuclear polarization in the quantum Hall effect

2005-03-16

arxiv.org/abs/cond-mat/0503412v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.95.056802

It is demonstrated that the now well-established `flip-flop' mechanism of spin exchange between electrons and nuclei in the quantum Hall effect can be reversed. We use a sample geometry which utilizes separately contacted edge states to establish a local nuclear spin polarization --close to the maximum value achievable-- by driving a current between electron states of different spin orientation. When the externally applied current is switched off, the sample exhibits an output voltage of up to a few tenths of a meV, which decays with a time constant typical for the nuclear spin relaxation. The surprizing fact that a sample with a local nuclear spin polarization can act as a source of energy and that this energy is well above the nuclear Zeeman splitting is explained by a simple model which takes into account the effect of a local Overhauser shift on the edge state reconstruction.

Affiliated with

Also associated with

No associations

Rating

Electrical read-out of the local nuclear polarization in the quantum Hall effect does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Electrical read-out of the local nuclear polarization in the quantum Hall effect, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical read-out of the local nuclear polarization in the quantum Hall effect will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-605859