Electrically Induced Nuclear Quadrupole Spin Transitions in a GaAs Single Crystal

Method for atomic-layer-resolved measurement of polarization fields by nuclear magnetic resonance

“…In the case of bulk GaAs, the crystal lattice belongs to the T d point group, which, along with the equivalence of the coordinates, indicates that all components of (V i j ) Eϭ0 must vanish, that C i j,k 0 only for i j k, and that these nonzero components are equivalent. 24 The C tensor itself may be broken up into two contributing factors:…”

“…Both this transformation of a nonsecular perturbation into a highresolution secular observable and the proposed localized measurement of dielectric response are novel aspects of this work. On bulk samples in experiments where resolution was limited by dipolar broadening, the rf LQSE has been used previously to depolarize nuclear spins in GaAs, 23,24 while the inverse of the rf LQSE has been used to realize electrically detected nuclear quadrupole resonance. 25,26 In contrast, we predict that, by employing POWER NMR and isotopic dilution, our technique can yield NMR line shapes with atomiclayer resolution that report on the rf LQSE in a GaAs QW sample.…”

Mapping of strain and electric fields inGaAs/AlxEickhoff1, Lenzmann2, Suter3 et al. 2003Phys. Rev. B410330View full textAdd to dashboardCite

“…1͒. For such a rotation Brun et al 35 calculated the whole coupling tensor. The only element generating an EFG by applying an electric field in growth direction is An electric-field contribution to the observed splittings cannot be excluded for the uncapped sample.…”

Comparison of nuclear electric resonance and nuclear magnetic resonance in integer and fractional quantum Hall states

“…15,16 In these experiments, optically-induced nuclear polarization combined with Faraday/Kerr effect measurements were performed in the quantum wells at lower magnetic field. The electric quadrupole interaction, which was confirmed in a bulk GaAs, 17 was considered as a nuclear spin resonance mechanism in quantum well. In the QHE regime, NER studies have focused on measurements on the spin phase transition at Landau-level filling factor, ν = 2/3, where spin domain dynamics are considered as a possible origin of nuclear depolarization.…”

“…It has been shown that this quadrupole interaction is predominantly driven by the electric field due to the correlation of the electric fields and the EFG at nuclei that lack the inversion symmetry of the GaAs crystal. 17,21 According to the transition selection rules between 4 nuclear-spin levels of 75 As, |m⟩, where m is the magnetic quantum number for the total angular momentum, the quadrupole interaction allows the two satellite ∆m = ±1 transitions (|+1/2⟩ ⇔ |+3/2⟩ and |−1/2⟩ ⇔ |−3/2⟩) without the central transition |−1/2⟩ ⇔ |+1/2⟩, 16,22 and even allows the ∆m = ±2 transitions (|−1/2⟩ ⇔ |+3/2⟩, |+1/2⟩ ⇔ |−3/2⟩) leading to the 2 f As resonance. 15,22,23 In contrast, for the magnetic dipole interaction, the ∆m = ±1 transitions between all the neighboring levels result in the appearance of three NMR lines.…”