Valley dependent many-body effects in 2D semiconductors

Abstract

We calculate the valley degeneracy ($g_v$) dependence of the many-body renormalization of quasiparticle properties in multivalley 2D semiconductor structures due to the Coulomb interaction between the carriers. Quite unexpectedly, the $g_v$ dependence of many-body effects is nontrivial and non-generic, and depends qualitatively on the specific Fermi liquid property under consideration. While the interacting 2D compressibility manifests monotonically increasing many-body renormalization with increasing $g_v$, the 2D spin susceptibility exhibits an interesting non-monotonic $g_v$ dependence with the susceptibility increasing (decreasing) with $g_v$ for smaller (larger) values of $g_v$ with the renormalization effect peaking around $g_v\sim 1-2$. Our theoretical results provide a clear conceptual understanding of recent valley-dependent 2D susceptibility measurements in AlAs quantum wells.

5 pages, 3 figures

References in corpus (12)

• Metallic behavior and related phenomena in two dimensions
• Valley susceptibility of an interacting two-dimensional electron system
• Spin Susceptibility of an Ultra-Low Density Two Dimensional Electron System
• Unexpected Behavior of the Local Compressibility Near the B=0 Metal-Insulator Transition
• Thermodynamic Signature of a Two-Dimensional Metal-Insulator Transition
• Resistivity of dilute 2D electrons in an undoped GaAs heterostructure
• Transport and percolation in a low-density high-mobility two-dimensional hole system
• Thermodynamic density of states of two-dimensional GaAs systems near the apparent metal-insulator transition
• 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
• Temperature and Magnetic Field Enhanced Hall Slope of a Dilute 2D Hole System in the Ballistic Regime
• Enhancement of valley susceptibility upon complete spin-polarization

Cited by in corpus (14)

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• Strongly interaction-enhanced valley magnetic response in monolayer WSe2
• Valley polarization assisted spin polarization in two dimensions
• Controlling exciton many-body states by the electric-field effect in monolayer MoS${}_2$
• Contrast between spin and valley degrees of freedom
• Spontaneous valley polarization of interacting carriers in a monolayer semiconductor
• Compressibility, zero sound, and effective mass of a fermionic dipolar gas at finite temperature
• Temperature-dependent compressibility in graphene and two-dimensional systems
• Universal enhancement of superconductivity in two dimensional semiconductors at low doping by electron-electron interaction
• Valley-dependent 2D transport in Si-MOSFETs
• Thermoelectric properties of the interacting two dimensional electron gas in the diffusion regime
• Magneto-Optical Measurements of the Negatively Charged 2$s$ Exciton in WSe${}_2$
• Exchange Enhancement of the Electron-Phonon Interaction: the Case of Weakly Doped Two-Dimensional Multivalley Semiconductors