Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems

Abstract

We report measurements and calculations of the spin-subband depopulation, induced by a parallel magnetic field, of dilute GaAs two-dimensional (2D) hole systems. The results reveal that the shape of the confining potential dramatically affects the values of in-plane magnetic field at which the upper spin subband is depopulated. Most surprisingly, unlike 2D electron systems, the carrier-carrier interaction in 2D hole systems does not significantly enhance the spin susceptibility. We interpret our findings using a multipole expansion of the spin density matrix, and suggest that the suppression of the enhancement is related to the holes' band structure and effective spin j=3/2.

6 pages, 4 figures, substantially extended discussion of results

References in corpus (22)

• Hole-mediated ferromagnetism in tetrahedrally coordinated semiconductors
• Metallic behavior and related phenomena in two dimensions
• Correlation energy and spin polarization in the 2D electron gas
• Theory of Magnetic Anisotropy in III_{1-x}Mn_{x}V Ferromagnets
• 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
• Wigner crystallization and metal-insulator transition of two-dimensional holes in GaAs/AlGaAs at B=0
• 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
• In-plane magnetic field-induced spin polarization and transition to insulating behavior in two-dimensional hole systems
• The thermodynamic spin magnetization of strongly correlated 2d electrons in a silicon inversion layer
• Hole-Hole Interaction Effect in the Conductance of the Two-Dimensional Hole Gas in the Ballistic Regime
• Role of finite layer thickness in spin-polarization of GaAs 2D electrons in strong parallel magnetic fields
• Anisotropic magnetoresistance of GaAs two-dimensional holes
• Interaction Corrections to Two-Dimensional Hole Transport in Large $r_s$ Limit
• Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom
• Density dependent spin susceptibility and effective mass in interacting quasi-two dimensional electron systems
• Spin Density Matrix of Spin-3/2 Hole Systems
• Spin Polarization of Quasi Two-Dimensional Hole Systems

Cited by in corpus (21)

• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Density-Dependent Quantum Hall States and Zeeman Splitting in Monolayer and Bilayer WSe${}_2$
• Zeeman splitting in ballistic hole quantum wires
• Spin Orientation of Holes in Quantum Wells
• Observation of Spontaneous Ferromagnetism in a Two-Dimensional Electron System
• Spin precession and alternating spin polarization in spin-3/2 hole systems
• Thermal and quantum melting phase diagrams for a magnetic-field-induced Wigner solid
• Observation of orientation- and $k$-dependent Zeeman spin-splitting in hole quantum wires on (100)-oriented AlGaAs/GaAs heterostructures
• Exchange energy and generalized polarization in the presence of spin-orbit coupling in two dimensions
• Interplay between one-dimensional confinement and crystallographic anisotropy in ballistic hole quantum wires
• Bloch Ferromagnetism of Composite Fermions
• High density limit of the two-dimensional electron liquid with Rashba spin-orbit coupling
• Lande-like formula for the g factors of hole-nanowire subband edges
• Effective Mass and Spin Susceptibility of Dilute Two-Dimensional Holes in GaAs
• The origin of gate hysteresis in p-type Si-doped AlGaAs/GaAs heterostructures
• Carrier-density-controlled anisotropic spin susceptibility of two-dimensional hole systems
• Suppression of Coulomb exchange energy in quasi-two-dimensional hole systems
• Drude weight and optical conductivity of a two-dimensional heavy-hole gas with $k$-cubic spin-orbit interactions
• Ultraclean two-dimensional hole systems with mobilities exceeding 10${}^7$ cm${}^2$/Vs
• Quasiparticle velocities in 2D electron/hole liquids with spin-orbit coupling
• In-plane magnetic field effect on hole cyclotron mass and $g_z$ factor in high-mobility SiGe/Ge/SiGe structures