Nanoscale ferromagnetism in non-magnetic doped semiconductors

Abstract

While ferromagnetism at relatively high temperatures is seen in diluted magnetic semiconductors such as Ga_(1-x)Mn_(x)As, doped semiconductors without magnetic ions have not shown evidence for ferromagnetism. Using a generalized disordered Hubbard model designed to characterize hydrogenic centers in semiconductors, we find that such systems may also exhibit a ferromagnetic ground state, at least on the nanoscale. This is found most clearly in a regime inaccessible to bulk systems, but attainable in quantum dots as well as heterostructures. We present numerical results demonstrating the occurrence of high spin ground states in both lattice and positionally disordered systems. We examine how the magnetic phases are affected by characteristics of real doped semiconductors, such as positional disorder and electron-hole asymmetry.

arXiv comment4 pages, 5 figures

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Cited by in corpus (14)

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• Extended Hubbard model for mesoscopic transport in donor arrays in silicon
• Probing interaction-induced ferromagnetism in optical superlattices
• Spontaneous breaking of time reversal symmetry in strongly interacting two dimensional electron layers in silicon and germanium
• Suppression of low-frequency noise in two-dimensional electron gas at degenerately doped Si:P δ-layers
• Polaronic mechanism of Nagaoka ferromagnetism in Hubbard models
• Ab Initio Exact Diagonalization Simulation of the Nagaoka Transition in Quantum Dots
• Nagaoka ferromagnetism in doped Hubbard models in optical lattices
• Full Counting Statistics of Spin-Flip/Conserving Charge Transitions in Pauli-Spin Blockade
• Search for Ferromagnetism in doped semiconductors in the absence of transition metal ions
• Nagaoka spin-valley ordering in silicene quantum dots
• Optimal array geometries for kinetic magnetism and Nagaoka polarons
• Itinerant magnetism in Hubbard models with long-range interactions