In-plane optical phonon modes of current-carrying graphene
arXiv:2205.00636 · doi:10.1103/PhysRevB.105.235405
Abstract
In this work, we study the in-plane optical phonon modes of current-carrying single-layer graphene whose coupling to the electron gas is strong. Such modes are expected to undergo a frequency shift compared to the non-current-carrying state due to the non-equilibrium occupation of the Dirac cone electronic eigen-states with the flowing electron gas. Large electron-phonon coupling (EPC) can be identified by an abrupt change in the slope of the phonon mode dispersion known as the Kohn anomaly, which mainly occurs for (i) the in-plane longitudinal/transverse optical (LO/TO) modes at the Brillouin zone (BZ) center ( point), and (ii) the TO modes at the BZ corners ( points). We show that the breaking of the rotational symmetry by the DC current results in different frequency shifts to the -TO and -LO modes. More specifically, the DC current breaks the TO-LO mode degeneracy at the point which ideally would be manifested as the splitting of the Raman G peak.
References in corpus (62)
- The electronic properties of graphene
- Uniaxial Strain in Graphene by Raman Spectroscopy: G peak splitting, Gruneisen Parameters and Sample Orientation
- Observation of Electron-Hole Puddles in Graphene Using a Scanning Single Electron Transistor
- Born-Oppenheimer Breakdown in Graphene
- STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride
- Electric Field Effect Tuning of Electron-Phonon Coupling in Graphene
- Optical Separation of Mechanical Strain from Charge Doping in Graphene
- Commensurate-incommensurate transition for graphene on hexagonal boron nitride
- Kohn Anomalies and Electron-Phonon Interaction in Graphite
- Origin of Spatial Charge Inhomogeneity in Graphene
- Negative local resistance caused by viscous electron backflow in graphene
- Photocurrent imaging and efficient photon detection in a graphene transistor
- Non-adiabatic Kohn-anomaly in a doped graphene monolayer
- Raman spectroscopy as probe of nanometer-scale strain variations in graphene
- The phonon dispersion of graphite by inelastic x-ray scattering
- The phonon dispersion of graphite revisited
- Energy dissipation in graphene field-effect transistors
- Strain-dependent Splitting of Double Resonance Raman Scattering Band in Graphene
- Imaging viscous flow of the Dirac fluid in graphene
- Impact of the electron-electron correlation on phonon dispersions: failure of LDA and GGA functionals in graphene and graphite
- Raman 2D-Band Splitting in Graphene: Theory and Experiment
- Quantum imaging of current flow in graphene
- Electron Transport and Hot Phonons in Carbon Nanotubes
- Spatially resolved spectroscopy of monolayer graphene on SiO2
- Anharmonic properties from a generalized third order ab~initio approach: theory and applications to graphite and graphene
- Electron and optical phonon temperatures in electrically biased graphene
- Electron-Phonon Coupling and Raman Spectroscopy in Graphene
- Theory of resonant multiphonon Raman scattering in graphene
- Transport properties of graphene in the high-current limit
- Energy Relaxation of Hot Dirac Fermions in Graphene
- Non-equilibrium dynamics of photo-excited electrons in graphene: collinear scattering, Auger processes, and the impact of screening
- Electron-Phonon Interactions and the Intrinsic Electrical Resistivity of Graphene
- Phonon-limited resistivity of graphene by first-principle calculations: electron-phonon interactions, strain-induced gauge field and Boltzmann equation
- Spatially resolved edge currents and guided-wave electronic states in graphene
- Fizeau Drag in Graphene Plasmonics
- Conductivity of suspended and non-suspended graphene at finite gate voltage
- Symmetry constraints on phonon dispersion in graphene
- Efficient Fizeau Drag from Dirac electrons in monolayer graphene
- Graphene, a material for high temperature devices; intrinsic carrier density, carrier drift velocity, and lattice energy
- Phonon surface mapping of graphite: disentangling quasi--degenerate phonon dispersions
- Hydrodynamic-to-ballistic crossover in Dirac fluid
- Simultaneous imaging of voltage and current density of flowing electrons in two dimensions
- Phonon dispersion in graphene
- Current-induced birefringent absorption and non-reciprocal plasmons in graphene
- Non-Reciprocal and Collimated Surface Plasmons in Drift-biased Graphene Metasurfaces
- Graphene hot-electron light bulb: incandescence from hBN-encapsulated graphene in air
- Emission of plasmons by drifting Dirac electrons: where hydrodynamics matters
- Phonon self-energy corrections to non-zero wavevector phonon modes in single-layer graphene
- Current-controlled light scattering and asymmetric plasmon propagation in graphene
- Emergence of a ZO Kohn anomaly in quasi-freestanding epitaxial graphene
- Drift-induced modifications to the dynamical polarization of graphene
- Imaging graphene field-effect transistors on diamond using nitrogen-vacancy microscopy
- Fermi energy dependence of first- and second-order Raman spectra in graphene: Kohn anomaly and quantum interference effect
- Chirality-induced Dynamic Kohn Anomalies in Graphene
- Electrooptics of graphene: field-modulated reflection and birefringence
- Decay and Frequency Shift of Inter and Intravalley Phonons in Graphene -Dirac Cone Migration-
- Disorder-induced double resonant Raman process in graphene
- Negative dynamic conductivity of a current driven array of graphene nanoribbons
- Imaging Electron Motion in Graphene
- Electro-Optics of Current-carrying Graphene
- Long-wavelength optical phonon behavior in uniaxial strained graphene: Role of electron-phonon interaction
- Broadband Focusing of Acoustic Plasmons in Graphene with an Applied Current