Presentation Information
[Tu-P-106]Pseudospin Ferromagnetism in the Quantum Hall Regime
〇Sofya Andreeva1,2, Anton Shchepetilnikov2, Georgy Nikolaev2, Alina Khisameeva2, Oleg Orlov2, Igor Kukushkin2 (1. National Research University Higher School of Economics (Russia), 2. Institute of Solid State Physics RAS (Russia))
We use electrically detected ESR in AlAs quantum wells to probe valley polarizarion, revealing pseudospin ferromagnetic transitions at ν = 2. We establish a comprehensive picture of field- and strain-driven quantum phase transitions and determine Tc = 0.9 K for the pseudospin ferromagnet.