Spin susceptibility and effective mass of two-dimensional electrons in MgxZn1-xO/ZnO heterostructures

Abstract

We report measurements of the spin susceptibility and the electron effective mass for two-dimensional electrons confined at the interfaces of MgxZn1-xO/ZnO single heterostructures (x = 0.05, 0.08, and 0.11), grown by molecular-beam epitaxy on (0001) ZnO substrates. By tuning the built-in polarization through control of the barrier composition, the electron density was systematically varied in the range of 5.6 x 10^11 to 1.6 x 10^12 cm^-2, corresponding to a range of 3.1 < rs < 5.2, where rs is the average electron spacing measured in units of the effective Bohr radius. We used the coincidence technique, where crossings of the spin-split Landau levels occur at critical tilt angles of magnetic field, to evaluate the spin susceptibility. In addition, we determined the effective mass from the temperature dependence of the Shubnikov-de Haas oscillations measured at the coincidence conditions. The susceptibility and the effective mass both gradually increase with decreasing electron density, reflecting the role of electron-electron interaction.

arXiv comment4 pages, 4figures, accepted for publication in Phys. Rev. B

References in corpus (19)

• Spin Degree of Freedom in a Two-Dimensional Electron Liquid
• The low-density spin susceptibility and effective mass of mobile electrons in Si inversion layers
• Spin Susceptibility of an Ultra-Low Density Two Dimensional Electron System
• Indication of the ferromagnetic instability in a dilute two-dimensional electron system
• Measurements of the density-dependent many-body electron mass in 2D GaAs/AlGaAs Heterostructures
• Scaling of the magnetoconductivity of silicon MOSFET's: evidence for a quantum phase transition in two dimensions
• Spin susceptibility of two-dimensional electrons in narrow AlAs quantum wells
• Spin polarization and g-factor of a dilute GaAs two-dimensional electron system
• First-principles study of polarization in ZnMgO
• Interaction Corrections to Two-Dimensional Hole Transport in Large $r_s$ Limit
• Effects of thickness on the spin susceptibility of the 2D electron gas
• InAs-AlSb quantum wells in tilted magnetic fields
• Effective mass suppression in dilute, spin-polarized two-dimensional electron systems
• Anti-crossings of spin-split Landau levels in an InAs two-dimensional electron gas with spin-orbit coupling
• Mass enhancement of two-dimensional electrons in thin-oxide Si-MOSFET's
• Spin Susceptibility of Interacting Two-dimensional Electrons with Anisotropic Effective Mass
• Spin Splitting in GaAs (100) Two-Dimensional Holes
• Spin Susceptibility of a 2D Electron System in GaAs towards the Weak Interaction Region
• Dependence of persistent gaps at Landau level crossings on relative spin

Cited by in corpus (15)

• Quantum Hall Effect in Ultrahigh Mobility Two-dimensional Hole Gas of Black Phosphorus
• Challenges and opportunities of ZnO-related single crystalline heterostructures
• Odd-integer quantum Hall states and giant spin susceptibility in p-type few-layer WSe2
• Optical manifestation of the Stoner ferromagnetic transition in 2D electron systems
• Impact of antiferromagnetic order on Landau level splitting of quasi-two-dimensional Dirac fermions in EuMnBi${}_2$
• Polarization dependent Landau level crossing in a two-dimensional electron system in MgZnO/ZnO-heterostructure
• Temperature dependent magnetotransport around $\nu$= 1/2 in ZnO heterostructures
• Quantum Transport in Ambipolar Few-layer Black Phosphorus
• Competition between fractional quantum Hall liquid and Wigner solid at small fillings: Role of layer thickness and Landau level mixing
• Magneto-photoluminescence of charged excitons from MgZnO/ZnO heterojunctions
• Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
• Determination of $g$-factor in InAs two-dimensional electron system by capacitance spectroscopy
• High-field Studies on Layered Magnetic and Polar Dirac Metals
• Measurements of the magnetic properties of conduction electrons
• Enhanced quantum oscillatory magnetization and non-equilibrium currents in an interacting two-dimensional electron system in MgZnO/ZnO with repulsive scatterers