Femtosecond currents in transition metal dichalcogenides monolayers
arXiv:2011.07345 · doi:10.1103/PhysRevB.103.155416
Abstract
We theoretically study the interaction of an ultrafast intense linearly polarized optical pulse with monolayers of transition metal dichalcogenides (TMDCs). Such a strong pulse redistributes electrons between the bands and generates femtosecond currents during the pulse. Due to the large bandwidth of the incident pulse, this process is completely off-resonant. While in TMDCs the time-reversal symmetry is conserved, the inversion symmetry is broken and these monolayers have the axial symmetry along armchair direction but not along the zigzag one. Therefore, the pulse polarized along the asymmetric direction of TMDC monolayer generates both longitudinal, i.e., along the direction of polarization, and transverse, i.e., in the perpendicular direction, currents. Such currents result in charge transfer through the system. We study different TMDC materials and show how the femtosecond transport in TMDC monolayers depend on their parameters, such as lattice constant and bandgap.
References in corpus (29)
- Atomically thin MoS2: A new direct-gap semiconductor
- 2D materials and van der Waals heterostructures
- Berry Phase Effects on Electronic Properties
- Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
- Anomalous Hall effect
- Bandgap Engineering of Strained Monolayer and Bilayer MoS2
- Substrate-induced band gap opening in epitaxial graphene
- Observation of giant bandgap renormalization and excitonic effects in a monolayer transition metal dichalcogenide semiconductor
- Three-band tight-binding model for monolayers of group-VIB transition metal dichalcogenides
- Ultrafast collinear scattering and carrier multiplication in graphene
- Snapshots of non-equilibrium Dirac carrier distributions in graphene
- Light-field driven currents in graphene
- Femtosecond carrier dynamics and saturable absorption in graphene suspensions
- High-harmonic generation in amorphous solids
- Single particle relaxation time versus transport scattering time in a 2D graphene layer
- Non-equilibrium dynamics of photo-excited electrons in graphene: collinear scattering, Auger processes, and the impact of screening
- Semiconducting graphene from highly ordered substrate interactions
- Coherent electron trajectory control in graphene
- Metal nanofilm in strong ultrafast optical fields
- Femtosecond valley polarization and topological resonances in transition metal dichalcogenides
- Ultrafast pseudospin dynamics in graphene
- Topological resonance and single-optical-cycle valley polarization in gapped graphene
- Interaction of carrier envelope phase-stable laser pulses with graphene: the transition from the weak-field to the strong-field regime
- Attosecond synchronization of extreme ultraviolet high harmonics from crystals
- Review of Ultrafast Spectroscopy Studies of Valley Carrier Dynamics in Two Dimensional Semiconducting Transition Metal Dichalcogenides
- A Gauge Invariant Formulation of Interband and Intraband Currents in Solids
- Nonlinear optical response induced by non-Abelian Berry curvature in time-reversal-invariant insulators
- Fundamentally fastest optical processes at the surface of a topological insulator
- Ultrafast strong-field absorption in gapped graphene