Hysteretic resistance spikes in quantum Hall ferromagnets without domains

Details Hysteretic resistance spikes in quantum Hall ferromagnets without domains Hysteretic resistance spikes in quantum Hall ferromagnets without domains

2004-12-17

arxiv.org/abs/cond-mat/0412491v2

Phys. Rev. Lett. 99, 026801 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, published version (some changes to the text; same figures as in v1)

Scientific paper

10.1103/PhysRevLett.99.026801

We use spin-density-functional theory to study recently reported hysteretic magnetoresistance \rho_{xx} spikes in Mn-based 2D electron gases [Jaroszy\'{n}ski et al. Phys. Rev. Lett. (2002)]. We find hysteresis loops in our calculated Landau fan diagrams and total energies signaling quantum-Hall-ferromagnet phase transitions. Spin-dependent exchange-correlation effects are crucial to stabilize the relevant magnetic phases arising from distinct symmetry-broken excited- and ground-state solutions of the Kohn-Sham equations. Besides hysteretic spikes in \rho_{xx}, we predict hysteretic dips in the Hall resistance \rho_{xy}. Our theory, without domain walls, satisfactorily explains the recent data.

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