Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom

Abstract

We report measurements of the spin susceptibility, $\chi \propto g_v{g}^{\ast }{m}^{\ast }$, in an AlAs two-dimensional electron system where, via the application of in-plane stress, we transfer electrons from one conduction-band valley to another ($g_v$ is the valley degeneracy, and $m^{\ast }$ and $g^{\ast }$ are the electron effective mass and g-factor). At a given density, when the two valleys are equally populated ($g_v=2$), the measured $g^{\ast }{m}^{\ast }$ is smaller than when only one valley is occupied ($g_v=1$). This observation counters the common assumption that a two-valley two-dimensional system is effectively more dilute than a single-valley system because of its smaller Fermi energy.

arXiv comment4 pages, 3 figures

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• Metallic behavior and related phenomena in two dimensions
• Correlation energy and spin polarization in the 2D electron gas
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• The low-density spin susceptibility and effective mass of mobile electrons in Si inversion layers
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• Indication of the ferromagnetic instability in a dilute two-dimensional electron system
• Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field
• Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system
• Low-temperature, in situ tunable, uniaxial stress measurements in semiconductors using a piezoelectric actuator
• Role of finite layer thickness in spin-polarization of GaAs 2D electrons in strong parallel magnetic fields
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Cited by in corpus (32)

• Valley susceptibility of an interacting two-dimensional electron system
• Two-dimensional electrons occupying multiple valleys in AlAs
• Band mass anisotropy and the intrinsic metric of fractional quantum Hall systems
• Metal-insulator transitions and the effects of electron-electron interactions in two-dimensional electron systems
• Observation of Quantum Hall Valley Skyrmions
• Valley polarization and susceptibility of composite fermions around nu=3/2
• Effects of thickness on the spin susceptibility of the 2D electron gas
• Observation of Spontaneous Ferromagnetism in a Two-Dimensional Electron System
• Strongly interaction-enhanced valley magnetic response in monolayer WSe2
• Density dependent spin susceptibility and effective mass in interacting quasi-two dimensional electron systems
• Anomalous Spin Polarization of GaAs Two-Dimensional Hole Systems
• Spin-valley phase diagram of the two-dimensional metal-insulator transition
• Observation of spontaneous valley polarization of itinerant electrons
• Valley polarization assisted spin polarization in two dimensions
• Contrast between spin and valley degrees of freedom
• Spin Susceptibility of Interacting Two-dimensional Electrons with Anisotropic Effective Mass
• Valley dependent many-body effects in 2D semiconductors
• Spin-independent effective mass in a valley-degenerate electron system
• Spin-dependent resistivity at transitions between integer quantum Hall states
• Quantum Hall Valley Nematics
• Aluminum arsenide cleaved-edge overgrown quantum wires
• Parallel Magnetic Field Tuning of Valley Splitting in AlAs Two-Dimensional Electrons
• Realization of a Valley Superlattice
• Dependence of persistent gaps at Landau level crossings on relative spin
• Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
• Valley degeneracy in biaxially strained aluminum arsenide quantum wells
• Enhancement of valley susceptibility upon complete spin-polarization
• Piezoplasmonics: strain-induced tunability of plasmon resonance in AlAs quantum wells
• Metallic behaviour in SOI quantum wells with strong intervalley scattering
• Zeeman splitting of interacting two-dimensional electrons with two effective masses
• Magnetoresistance and spin polarization in the insulating regime of a Si two-dimensional electron system
• Pair distribution functions of the two-dimensional electron gas with two symmetric valleys