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October 1, 2026
HSE Researchers Show How Congenital Motor Disorders Affect Brain Development
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Criticality of a pseudospin phase transition

Physical Review B: Condensed Matter and Materials Physics. 2026. Vol. 114. No. 6. Article 065420.
S. A. Andreeva, Orlov O. V., A. V. Shchepetilnikov, Nikolaev G. A., Ya. V. Fedotova, Khisameeva A. R., Dremin A. A., Reichl C., Wegscheider W., Kukushkin I. V.

We investigate the temperature dependence of the pseudospin phase transition at filling factor 𝜈=2 in the quantum Hall regime. Experiments were performed on a high-quality, wide AlAs quantum well, where the pseudospin degree of freedom arises naturally from the near degeneracy and equivalence of the two conduction-band valleys. The anisotropic 𝑔-factor inherent to AlAs enabled independent measurement of the spin resonance response for each valley, thereby allowing quantification of the pseudospin polarization. The observed critical behavior of the pseudospin polarization yielded a critical temperature T𝑐=0.9K for the phase transition. The value of T𝑐 was further verified by the temperature dependence of the resistance spike that emerges at the phase transition.

Research target: Physics
Language: English
DOI
Text on another site
Keywords: Two-dimensional electron systemquantum Hall effectferromagnetismelectron spin resonancestrongly correlated systemsvalley degrees of freedom
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