Hysteretic resistance spikes in quantum hall ferromagnets without domains |
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Authors: | Freire Henrique J P Egues J Carlos |
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Institution: | Departamento de Física e Informática, Instituto de Física de S?o Carlos, Universidade de S?o Paulo, 13560-970 S?o Carlos, S?o Paulo, Brazil. |
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Abstract: | We use spin-density-functional theory to study recently reported hysteretic magnetoresistance rho(xx) spikes in Mn-based 2D electron gases Phys. Rev. Lett. 89, 266802 (2002)10.1103/PhysRevLett.89.266802]. 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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