Nuclear-spin polarization detection device and nuclear-spin polarization detection method
AssigneeJapan Science and Technology Agency
InventorsHongwu Liu, Kaifeng Yang, Yoshiro Hirayama
Life of this patent
Estimating the term…
Abstract
Provided is a total electrical nuclear-spin polarization device that is applicable to many narrow-gap semiconductor two-dimensional quantum structures such as InSb with a large g-factor and with a mobility having a normal value. A nuclear-spin polarization device 1 creates a state where the Landau-level separation and the Zeeman-level separation in a sample are equal to each other in a magnetic field, thereby crossing different spin states, and detects nuclear-spin polarization from a resistance change at the crossing point caused by the nuclear-spin polarization.
Claims11
A nuclear-spin polarization detection device comprising:
- a crossing part that inclines a two-dimensional quantum structure in a magnetic field to cross Landau-level separation and Zeeman-level separation on the two-dimensional quantum structure with use of an actuator thereof, and
- a polarizing part that polarizes nuclear spins in the two-dimensional quantum structure by flowing a current through the two-dimensional quantum structure,
- wherein the device detects polarization of the nuclear spins at a position where the Landau-level separation and the Zeeman-level separation are crossed by the crossing part from a resistance change at the position where the Landau-level separation and the Zeeman-level separation are crossed when the current is flowed through the two-dimensional quantum structure with use of a power supply.
A nuclear-spin polarization detection method characterized by comprising:
- (a) inclining a two-dimensional quantum structure in a magnetic field to cross Landau-level separation and Zeeman-level separation on the two-dimensional quantum structure with use of an actuator,
- (b) selecting a position in the two-dimensional quantum structure, where domains of different spin states are formed at crossing, from positions where the Landau-level separation and the Zeeman-level separation are crossed by step (a),
- (c) polarizing nuclear spins in the two-dimensional quantum structure by flowing a current through the two-dimensional quantum structure with use of a power supply, and
- (d) detecting polarization of the nuclear spins at a position where the Landau-level separation and the Zeeman-level separation are crossed by step (a) from a resistance change, detected using a resistance measuring device, at the position where the Landau-level separation and the Zeeman-level separation are crossed by the crossing part when the current is flowed through the two-dimensional quantum structure, wherein step (d) detects the polarization of the nuclear spins at the position selected by step (b).
Dependencies are inferred from the claim text.