Plasmons and Coulomb drag in Dirac/Schroedinger hybrid electron systems
arXiv:1206.3896 · doi:10.1103/PhysRevB.86.085421
Abstract
We show that the plasmon spectrum of an ordinary two-dimensional electron gas (2DEG) hosted in a GaAs heterostructure is significantly modified when a graphene sheet is placed on the surface of the semiconductor in close proximity to the 2DEG. Long-range Coulomb interactions between massive electrons and massless Dirac fermions lead to a new set of optical and acoustic intra-subband plasmons. Here we compute the dispersion of these coupled modes within the Random Phase Approximation, providing analytical expressions in the long-wavelength limit that shed light on their dependence on the Dirac velocity and Dirac-fermion density. We also evaluate the resistivity in a Coulomb-drag transport setup. These Dirac/Schroedinger hybrid electron systems are experimentally feasible and open new research opportunities for fundamental studies of electron-electron interaction effects in two spatial dimensions.
7 pages, 4 figures
References in corpus (17)
- Dielectric function, screening, and plasmons in 2D graphene
- Manipulating infrared photons using plasmons in transparent graphene superlattices
- Dynamical polarization of graphene at finite doping
- The Role of Electron-electron Interactions in Graphene ARPES Spectra
- Magnetic field tuning of terahertz Dirac plasmons in graphene
- Drude weight, plasmon dispersion, and a.c. conductivity in doped graphene sheets
- Coulomb Drag in the Exciton Regime in Electron-Hole Bilayers
- Anomalous Coulomb drag in electron-hole bilayers
- Excitation spectrum and high energy plasmons in single- and multi-layer graphene
- Strong phonon-plasmon coupled modes in the graphene/silicon carbide heterosystem
- Linear response of doped graphene sheets to vector potentials
- Coulomb Drag in Graphene
- Coulomb drag in graphene single layers separated by a thin spacer
- Coulomb Drag and High Resistivity Behavior in Double Layer Graphene
- Electron-electron interactions in decoupled graphene layers
- Theory of Coulomb drag for massless Dirac fermions
- Collective Excitations of Dirac Electrons in Graphene
Cited by in corpus (7)
- Plasmon modes in graphene-GaAs heterostructures
- Magnetoresistance of double layer hybrid system in tilted magnetic field
- Transport signatures of plasmon fluctuations in electron hydrodynamics
- Electron pairing with gapless excitations in mixed double layers
- Microscopic theory of plasmon-enabled resonant terahertz detection in bilayer graphene
- Collective excitations of a system of coupled relativistic and non-relativistic two-dimensional electron gases
- Selective damping of plasmons in coupled two-dimensional systems by Coulomb drag