Spin and Valley Noise in Two-Dimensional Dirac Materials

Abstract

We develop a theory for optical Faraday rotation noise in two-dimensional Dirac materials. In contrast to spin noise in conventional semiconductors, we find that the Faraday rotation fluctuations are influenced not only by spins but also the valley degrees of freedom attributed to intervalley scattering processes. We illustrate our theory with two-dimensional transition metal dichalcogenides and discuss signatures of spin and valley noise in the Faraday noise power spectrum. We propose optical Faraday noise spectroscopy as a technique for probing both spin and valley relaxation dynamics in two-dimensional Dirac materials.

5 pages, 2 figures

References in corpus (6)

• Two Dimensional Atomic Crystals
• Valley polarization in MoS2 monolayers by optical pumping
• Spin noise spectroscopy in GaAs (110) quantum wells: Access to intrinsic spin lifetimes and equilibrium electron dynamics
• Semiconductor Spin Noise Spectroscopy: Fundamentals, Accomplishments, and Challenges
• Defect-mediated spin relaxation and dephasing in graphene
• Spin noise spectroscopy of a single-quantum-well microcavity

Cited by in corpus (13)

• k.p theory for two-dimensional transition metal dichalcogenide semiconductors
• Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS_2 and WS_2
• Transport in two-dimensional topological materials: recent developments in experiment and theory
• The Theory of Spin Noise Spectroscopy: A Review
• Quantum transport and observation of Dyakonov-Perel spin-orbit scattering in monolayer MoS${}_2$
• Valley polarization induced second harmonic generation in graphene
• Photo-Induced Anomalous Hall Effect in Two-Dimensional Transition-Metal Dichalcogenides
• Spin fluctuations of non-equilibrium electrons and excitons in semiconductors
• Valley relaxation in graphene due to charged impurities
• Anomalous noise spectra in a spin-exchange-relaxation-free alkali-metal vapor
• Stochastic Faraday rotation induced by the electric current fluctuations in nanosystems
• Signature of Hanle Precession in Trilayer MoS2: Theory and Experiment
• Theory of Tunneling between Two-Dimensional Electron Layers Driven by Spin Pumping: Adiabatic Regime and Beyond