Two Dimensional Diluted Magnetic Semiconductor Systems

Abstract

We develop a theory for two-dimensional diluted magnetic semiconductor systems (e.g. ${\text{Ga}}_{1-x}{\text{Mn}}_x\text{As}$ layers) where the itinerant carriers mediating the ferromagnetic interaction between the impurity local moments, as well as the local moments themselves, are confined in a two-dimensional layer. The theory includes exact spatial disorder effects associated with the random local moment positions within a disordered RKKY lattice field theory description. We predict the ferromagnetic transition temperature ($T_c$) as well as the nature of the spontaneous magnetization. The theory includes disorder and finite carrier mean free path effects as well as the important correction arising from the {\it finite temperature} RKKY interaction, finding a strong density dependence of $T_c$ in contrast to the simple virtual crystal approximation.

New results added in connection with the Hohenberg-Mermin-Wagner theorem

References in corpus (10)

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• Theory of digital magneto resistance in ferromagnetic resonant tunneling diodes
• Ferromagnetic properties of p-(Cd,Mn)Te quantum wells: Interpretation of magneto-optical measurements by Monte Carlo simulations
• Clock Monte Carlo methods
• Coexistence of Superconductivity and Ferromagnetism in Dilute Co-doped $La_{1.89} Ce_{0.11} Cu O_{4\pm\d}$ System
• Re-entrant ferromagnetism in a generic class of diluted magnetic semiconductors
• Spin filter effect at room temperature in GaN/GaMnN ferromagnetic resonant tunneling diode
• Quasi-Two Dimensional Diluted Magnetic Semiconductors with Arbitrary Carrier Degeneracy
• Superexchange induced canted ferromagnetism in dilute magnets
• Ferromagnetism in chiral multilayer 2D semimetals
• Screening, Friedel oscillations, RKKY interaction, and Drude transport in anisotropic two-dimensional systems
• Diluted magnetic Dirac-Weyl materials: Susceptibility and ferromagnetism in three-dimensional chiral gapless semimetals
• A single layer of Mn in a GaAs quantum well: a ferromagnet with quantum fluctuations
• RKKY interaction induced by two-dimensional hole gases
• High-temperature spin polarization of high-mobility charge carriers in hybrid metal-semiconductor structures