Temperature dependent magnetotransport around $\nu$= 1/2 in ZnO heterostructures

Abstract

The sequence of prominent fractional quantum Hall states up to $\nu$=5/11 around $\nu$=1/2 in a high mobility two-dimensional electron system confined at oxide heterointerface (ZnO) is analyzed in terms of the composite fermion model. The temperature dependence of $\Rxx$ oscillations around $\nu$=1/2 yields an estimation of the composite fermion effective mass, which increases linearly with the magnetic field. This mass is of similar value to an enhanced electron effective mass, which in itself arises from strong electron interaction. The energy gaps of fractional states and the temperature dependence of $\Rxx$ at $\nu$=1/2 point to large residual interactions between composite fermions.

5 pages, 4 Figures

References in corpus (6)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Measurements of the density-dependent many-body electron mass in 2D GaAs/AlGaAs Heterostructures
• Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system
• Spin susceptibility and effective mass of two-dimensional electrons in MgxZn1-xO/ZnO heterostructures
• Dependence of Effective Mass on Spin and Valley Degrees of Freedom

Cited by in corpus (14)

• Challenges and opportunities of ZnO-related single crystalline heterostructures
• Landau Level Mixing and the Fractional Quantum Hall Effect
• Recent Experimental Progress of Fractional Quantum Hall Effect: 5/2 Filling State and Graphene
• Interplay of spin-orbit coupling and Coulomb interaction in ZnO-based electron system
• Valley Degenerate 2D Electrons in the Lowest Landau Level
• Polarization dependent Landau level crossing in a two-dimensional electron system in MgZnO/ZnO-heterostructure
• Excitations in a spin-polarized tow-dimensional electron gas
• SU(3) and SU(4) singlet quantum Hall states at $\nu =2/3$
• Edge states in 2D lattices with hopping anisotropy and Chebyshev polynomials
• Composite Fermion Mass
• Ultra-low acoustic-phonon-limited mobility and giant phonon-drag thermopower in MgZnO/ZnO heterostructures
• Phase transition from a composite fermion liquid to a Wigner solid in the lowest Landau level of ZnO
• Enhanced quantum oscillatory magnetization and non-equilibrium currents in an interacting two-dimensional electron system in MgZnO/ZnO with repulsive scatterers
• Flat bands on spherical surface: from Landau levels to giant-quantum-number orbitals