Electron-induced nuclear magnetic ordering in n-type semiconductors

Abstract

Nuclear magnetism in n-doped semiconductors with positive hyperfine constant is revisited. Two kinds of nuclear magnetic ordering can be induced by resident electrons in a deeply cooled nuclear spin system. At positive nuclear spin temperature below a critical value, randomly oriented nuclear spin polarons similar to that predicted by I. Merkulov [I. Merkulov, Physics of the Solid State 40, 930 (1998)] should emerge. These polarons are oriented randomly and within each polaron nuclear and electron spins are aligned antiferromagnetically. At negative nuclear spin temperature below a critical value we predict another type of magnetic ordering - dynamically induced nuclear ferromagnet. This is a long-range ferromagnetically ordered state involving both electrons and nuclei. It can form if electron spin relaxation is dominated by the hyperfine coupling, rather than by the spin-orbit interaction. Application of the theory to the n-doped GaAs suggests that the ferromagnetic order may be reached at experimentally achievable nuclear spin temperature ${\Theta }_N\approx 0.5$ $\mu$K and lattice temperature $T_L\approx 5$ K.

arXiv comment12 pages, 6 figures

References in corpus (11)

• Magnetism in Graphene Induced by Single-Atom Defects
• Multiferroics: different ways to combine magnetism and ferroelectricity
• The 2014 Magnetism Roadmap
• Low-temperature spin relaxation in n-type GaAs
• Spin relaxation of localized electrons in n-type semiconductors
• Measurement of the spin temperature of optically cooled nuclei and GaAs hyperfine constants in GaAs/AlGaAs quantum dots
• Interplay of Electron and Nuclear Spin Noise in GaAs
• Quantum simulation of spin ordering with nuclear spins in a solid state lattice
• Electron charge and spin delocalization revealed in the optically probed longitudinal and transverse spin dynamics in $n$-GaAs
• The nuclear polaron beyond the mean-field approximation
• Kinetic approach to the nuclear-spin polaron formation

Cited by in corpus (3)

• Warm-up spectroscopy of quadrupole-split nuclear spins in n-GaAs epitaxial layers
• Unveiling the electron-nuclear spin dynamics in an n-doped InGaAs epilayer by spin noise spectroscopy
• Nuclear spin polaron-formation: anisotropy effects and quantum phase transition