Current-induced nuclear-spin activation in a two-dimensional electron gas

Abstract

Electrically detected nuclear magnetic resonance was studied in detail in a two-dimensional electron gas as a function of current bias and temperature. We show that applying a relatively modest dc-current bias, I_dc ~ 0.5 microAmps, can induce a re-entrant and even enhanced nuclear spin signal compared with the signal obtained under similar thermal equilibrium conditions at zero current bias. Our observations suggest that dynamic nuclear spin polarization by small current flow is possible in a two-dimensional electron gas, allowing for easy manipulation of the nuclear spin by simple switching of a dc current.

5 pages, 3 figs

References in corpus (7)

• Dynamic Nuclear Polarization with Single Electron Spins
• Electrical polarization of nuclear spins in a breakdown regime of quantum Hall effect
• Spin Transition in the Half-Filled Landau Level
• NMR Probing Spin Excitations in the Ring-Like Structure of a Two-Subband System
• Resistively Detected NMR in Quantum Hall States: Investigation of the anomalous lineshape near $\nu =1$
• Dynamic nuclear polarization and Knight shift measurements in a breakdown regime of integer quantum Hall effect
• Coherent manipulation of nuclear spins in the breakdown regime of integer quantum Hall states

Cited by in corpus (10)

• Fractional quantum Hall effects in bilayers in the presence of inter-layer tunneling and charge imbalance
• Dynamic Nuclear Polarization in the Fractional Quantum Hall Regime
• Current Induced Nuclear Spin Depolarization at Landau Level Filling Factor nu=1/2
• Landauer-Büttiker approach for hyperfine mediated electronic transport in the integer quantum Hall regime
• Dispersive line shape in the vicinity of the ν = 1 quantum Hall state: Coexistence of Knight shifted and unshifted resistively detected NMR responses
• Resistively detected nuclear magnetic resonance via a single InSb two-dimensional electron gas at high temperature
• Resistively-detected NMR lineshapes in a quasi-one dimensional electron system
• 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
• Dipole-like dynamical nuclear spin polarization around a quantum point contact