Effective Mass and Spin Susceptibility of Dilute Two-Dimensional Holes in GaAs

Abstract

We report effective hole mass ($m^{\ast }$) measurements through analyzing the temperature dependence of Shubnikov-de Haas oscillations in dilute (density $p\sim 7\times 10^{10}$ cm${}^{-2}$, $r_s\sim 6$) two-dimensional (2D) hole systems confined to a 20 nm-wide, (311)A GaAs quantum well. The holes in this system occupy two nearly-degenerate spin subbands whose $m^{\ast }$ we measure to be $\sim$ 0.2 (in units of the free electron mass). Despite the relatively large $r_s$ in our 2D system, the measured $m^{\ast }$ is in good agreement with the results of our energy band calculations which do not take interactions into account. We hen apply a sufficiently strong parallel magnetic field to fully depopulate one of the spin subbands, and measure $m^{\ast }$ for the populated subband. We find that this latter $m^{\ast }$ is surprisingly close to the $m^{\ast }$ we measure in the absence of the parallel field. We also deduce the spin susceptibility of the 2D hole system from the depopulation field, and conclude that the susceptibility is enhanced by about 50% relative to the value expected from the band calculations.

7 pages, 7 figures

References in corpus (11)

• 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
• Density dependent spin susceptibility and effective mass in interacting quasi-two dimensional electron systems
• Effective mass suppression in dilute, spin-polarized two-dimensional electron systems
• Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems
• Spin Polarization Dependence of Carrier Effective Mass in Semiconductor Structures: Spintronic Effective Mass
• Contrast between spin and valley degrees of freedom
• Spin Susceptibility of Interacting Two-dimensional Electrons with Anisotropic Effective Mass
• Quantum Monte Carlo calculation of the energy band and quasiparticle effective mass of the two-dimensional Fermi fluid
• Effective mass suppression upon complete spin-polarization in an isotropic two-dimensional electron system
• Dependence of Effective Mass on Spin and Valley Degrees of Freedom

Cited by in corpus (12)

• Experimental Measurements of Effective Mass in Near Surface InAs Quantum Wells
• Anisotropic $g$-tensors in hole quantum dots: The role of the transverse confinement direction
• Tuning Fermi Liquids with polaritonic Cavities
• Carrier-density-controlled anisotropic spin susceptibility of two-dimensional hole systems
• Electrical and thermoelectric transport properties of two-dimensional fermionic systems with $k$-cubic spin-orbit coupling
• Suppression of Coulomb exchange energy in quasi-two-dimensional hole systems
• Magnetotransport properties of two-dimensional fermions with $k$-cubic Rashba spin-orbit interaction
• Spin polarization dependence of quasiparticle properties in graphene
• Quasiparticle velocities in 2D electron/hole liquids with spin-orbit coupling
• Dresselhaus spin-orbit interaction in the p-AlGaAs/GaAs/AlGaAs structure with a square quantum well: Surface Acoustic Waves Study
• In-plane magnetic field effect on hole cyclotron mass and $g_z$ factor in high-mobility SiGe/Ge/SiGe structures
• Density of states measurements for heavy subband of holes in HgTe quantum wells