Dynamic Nuclear Polarization in a Quantum Hall Corbino Disk

Abstract

Electrical polarization of nuclear spins is studied in a Corbino disk under a breakdown regime of the quantum Hall effect (QHE). Since the edge channels are completely absent in the Corbino disk, we conclude that the electric current flowing in the bulk channel of a quantum Hall conductor is relevant to dynamic nuclear polarization (DNP). A pump and probe measurement demonstrates that DNP emerges near the critical voltage of the QHE breakdown. The agreement of the onset voltage of DNP with that of the QHE breakdown indicates that the underlying origin of DNP is closely related to that of the QHE breakdown.

3 pages, 4 figures

References in corpus (2)

• Electrically-Controlled Nuclear Spin Polarization and Relaxation by Quantum-Hall states
• Electrical polarization of nuclear spins in a breakdown regime of quantum Hall effect

Cited by in corpus (4)

• Dynamic nuclear polarization induced by breakdown of fractional quantum Hall effect
• Role of chiral quantum Hall edge states in nuclear spin polarization
• Spatial gradient of dynamic nuclear spin polarization induced by breakdown of quantum Hall effect
• Coherent manipulation of nuclear spins in the breakdown regime of integer quantum Hall states