Warm-up spectroscopy of quadrupole-split nuclear spins in n-GaAs epitaxial layers

Abstract

The efficiency of the adiabatic demagnetization of nuclear spin system (NSS) of a solid is limited, if quadrupole effects are present. Nevertheless, despite a considerable quadrupole interaction, recent experiments validated the thermodynamic description of the NSS in GaAs. This suggests that nuclear spin temperature can be used as the universal indicator of the NSS state in presence of external perturbations. We implement this idea by analyzing the modification of the NSS temperature in response to an oscillating magnetic field at various frequencies, an approach termed as the warm-up spectroscopy. It is tested in a n-GaAs sample where both mechanical strain and built-in electric field may contribute to the quadrupole splitting, yielding the parameters of electric field gradient tensors for 75As and both Ga isotopes, 69Ga and 71Ga.

12 pages, 9 figures

References in corpus (5)

• Demagnetization of Quantum Dot Nuclear Spins: Breakdown of the Nuclear Spin Temperature Approach
• Spin temperature concept verified by optical magnetometry of nuclear spins
• Nuclear spin relaxation in n-GaAs: from insulating to metallic regime
• High-field optically detected nuclear magnetic resonance in GaAs
• Electron-induced nuclear magnetic ordering in n-type semiconductors

Cited by in corpus (3)

• Continuous time crystal in an electron-nuclear spin system: stability and melting of periodic auto-oscillations
• Simultaneous measurements of nuclear spin heat capacity, temperature and relaxation in GaAs microstructures
• Unveiling the electron-nuclear spin dynamics in an n-doped InGaAs epilayer by spin noise spectroscopy