Femtosecond valley polarization and topological resonances in transition metal dichalcogenides

Abstract

We theoretically introduce the fundamentally fastest induction of a significant population and valley polarization in a monolayer of a transition metal dichalcogenide (i.e., $\mathrm{Mo}{\mathrm{S}}_2$ and $\mathrm{W}{\mathrm{S}}_2$). This may be extended to other two-dimensional materials with the same symmetry. This valley polarization can be written and read-out by a pulse consisting of just a single optical oscillation with a duration of a few femtoseconds and an amplitude of $\sim 0.2\mathrm{V}/\mathring{\mathrm{A}}$. Under these conditions, we predict a new effect of {\em topological resonance}, which is due to Bloch motion of electrons in the reciprocal space where electron population textures are formed defined by non-Abelian Berry curvature. The predicted phenomena can be applied for information storage and processing in PHz-band optoelectronics.

9 pages, 7 figures

References in corpus (11)

• 2D materials and van der Waals heterostructures
• Valley polarization in MoS2 monolayers by optical pumping
• Light-emitting diodes by bandstructure engineering in van der Waals heterostructures
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Light-field driven currents in graphene
• Topology-Scaling Identification of Layered Solids and Stable Exfoliated 2D Materials
• Graphene Versus MoS2: a Short Review
• Strong-Field Perspective on High-Harmonic Radiation from Bulk Solids
• High-energy mid-infrared sub-cycle pulse synthesis from a parametric amplifier
• Sub-cycle optical control of current in a semiconductor: from the multiphoton to the tunneling regime
• Nonlinear optical response induced by non-Abelian Berry curvature in time-reversal-invariant insulators

Cited by in corpus (18)

• Light-Induced Valleytronics in Pristine Graphene
• Lightwave topology for strong-field valleytronics
• Topological resonance and single-optical-cycle valley polarization in gapped graphene
• Controlling Valley-Polarisation in Graphene via Tailored Light Pulses
• All-Optical Ultrafast Valley Switching in Two-Dimensional Materials
• Adiabaticity parameters for the categorization of light-matter interaction -- from weak to strong driving
• Valley polarization control in WSe2 monolayer by a single-cycle laser pulse
• All-optical valley switch and clock of electronic dephasing
• Topological resonance in Weyl semimetals in circularly-polarized optical pulse
• Subcycle control of valley-selective excitation via dynamical Franz-Keldysh effect in WSe${}_2$ monolayer
• Attosecond All-Optical Retrieval of Valley Polarization via Circular Dichroism in Transient Absorption
• Ultrafast valley polarization in bilayer graphene
• Femtosecond currents in transition metal dichalcogenides monolayers
• Bilayer graphene in strong ultrafast laser fields
• Coherent electron dynamics in monolayer ${\text{MoS}}_2$ under ultrashort optical pulse
• Laser pulse waveform control of Dirac fermions in graphene
• Ultrafast strong-field absorption in gapped graphene
• High-purity valley-polarized currents induced by bichromatic optical fields in two-dimensional materials