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Emergent Half Metal at Finite Temperatures in a Mott Insulator
TL;DR: In this article, the authors predict a novel half metal that emerges up on heating a Mott insulator, whose onset temperature is characterised by 100% spin polarisation, and demonstrate strong dependence of the onset temperature on electron correlation strength offering easy tunability of temperature regime of half metallicity.
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Abstract: Sustaining quantum mechanical phenomena at high temperatures is a long standing goal of condensed matter physics. Half metals, with the technological promise of providing 100$\%$ spin polarised currents sources, typically are low temperature phases that lose spin polarisation with temperature increase. Here we predict a novel half metal that emerges up on heating a Mott insulator, whose onset temperature is characterised by 100\% spin polarisation. We demonstrate strong dependence of the onset temperature on electron correlation strength offering easy tunability of temperature regime of half metallicity and discuss possible scenarios for experimental realisation.
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Citations
Design of two-dimensional half-metals with large spin gaps
Rui-Zi Zhang,Yuyang Zhang,Shixuan Du +2 more
TL;DR: Researchers propose a general rule to design 2D half-metals with large spin gaps by identifying materials with specific electronic structures, validated through DFT calculations, and predict novel half-metallic compounds with potential applications in magnetic nanodevices.
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References
Spintronics: Fundamentals and applications
TL;DR: Spintronics, or spin electronics, involves the study of active control and manipulation of spin degrees of freedom in solid-state systems as discussed by the authors, where the primary focus is on the basic physical principles underlying the generation of carrier spin polarization, spin dynamics, and spin-polarized transport.
Half-metallic ferromagnets: From band structure to many-body effects
TL;DR: A review of new developments in theoretical and experimental electronic-structure investigations of half-metallic ferromagnets (HMFs) is presented in this article, where the effects of electron-magnon interaction in HMFs and their manifestations in magnetic, spectral, thermodynamic, and transport properties are considered.
Strong Correlations from Hund’s Coupling
TL;DR: In this article, the authors review the theoretical understanding and physical properties of these Hund's metals, together with the relevance of this concept to transition-metal oxides (TMOs) of the 3D, and especially 4d, series (such as ruthenates), as well as to the iron-based superconductors (iron pnictides and chalcogenides).
A cold-atom Fermi–Hubbard antiferromagnet
Anton Mazurenko,Christie S. Chiu,Geoffrey Ji,Maxwell Parsons,Marton Kanasz-Nagy,Richard Schmidt,Fabian Grusdt,Eugene Demler,Daniel Greif,Markus Greiner +9 more
TL;DR: The results demonstrate that microscopy of cold atoms in optical lattices can help to understand the low-temperature Fermi–Hubbard model and provide a valuable benchmark for numerical simulations.
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