title: Phase diagram of a quantum Hall pseudospin ferromagnet in a two-subband electron system.
abstract: We employ the self-consistent local density approximation and the microscopic Hartree-Fock theory to investigate the quantum Hall pseudospin ferromagnets at the Landau levels degenerate regime of a single quantum well with two-subbands filled. We carry out a detailed calculation of the pseudospin anisotropy energy using real experimental parameters and obtain the phase diagrams that would be accessed experimentally by changing the electron density and the bias voltage. We find that an easy-plane and easy-axis quantum Hall pseudospin ferromagnet can form at total filling factors ν = 3 and ν = 4, respectively, which are consistent with experimental observation. Our study provides some insight into the symmetry of the ground state and may help in understanding the underlying mechanism.
authors.affiliation: Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, People's Republic of China.
authors.forename: Xiao-Jie
authors.initials: XJ
authors.lastname: Hao
authors.forename: Tao
authors.initials: T
authors.lastname: Tu
authors.forename: Gang
authors.initials: G
authors.lastname: Cao
authors.forename: Guang-Can
authors.initials: GC
authors.lastname: Guo
authors.forename: Hong-Wen
authors.initials: HW
authors.lastname: Jiang
authors.forename: Guo-Ping
authors.initials: GP
authors.lastname: Guo