Ultrafast all-optical manipulation of the charge-density-wave in VTe${}_2$

Abstract

The charge-density wave (CDW) phase in the layered transition-metal dichalcogenide VTe${}_2$ is strongly coupled to the band inversion involving vanadium and tellurium orbitals. In particular, this coupling leads to a selective disappearance of the Dirac-type states that characterize the normal phase, when the CDW phase sets in. Here, by means of broadband time-resolved optical spectroscopy (TR-OS), we investigate the ultrafast reflectivity changes caused by collective and single particle excitations in the CDW ground state of VTe${}_2$. Remarkably, our measurements show the presence of two collective (amplitude) modes of the CDW ground state. By applying a double-pulse excitation scheme, we show the possibility to manipulate these modes, demonstrating a more efficient way to control and perturb the CDW phase in VTe${}_2$.

References in corpus (23)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Phonons and related properties of extended systems from density-functional perturbation theory
• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Optimized norm-conserving Vanderbilt pseudopotentials
• Quantum ESPRESSO toward the exascale
• Ultrafast switching to a stable hidden topologically protected quantum state in an electronic crystal
• Single particle and collective excitations in the one-dimensional charge density wave solid K0.3MoO3 probed in real time by femtosecond spectroscopy
• Non-thermal separation of electronic and structural orders in a persisting charge density wave
• Dynamics of photoinduced Charge Density Wave-metal phase transition in K0.3MoO3
• Ultrafast manipulation of mirror domain walls in a charge density wave
• Single-particle and collective mode couplings associated with 1- and 2-directional electronic ordering in metallic RTe${}_3$ (R = Ho, Dy, Tb)
• Disentanglement of the electronic and lattice parts of the order parameter in a 1D Charge Density Wave system probed by femtosecond spectroscopy
• Optical manipulation of electronic dimensionality in a quantum material
• Nonequilibrium Charge-Density-Wave Order Beyond the Thermal Limit
• Nanoscale imaging of unusual photo-acoustic waves in thin flake VTe${}_2$
• Femtosecond data storage, processing and search using collective excitations of a macroscopic quantum state
• Switching of band inversion and topological surface states by charge density wave
• Revealing extremely low energy amplitude modes in the charge-density-wave compound LaAgSb${}_2$
• Coherent control theory and experiment of optical phonons in diamond
• Optical control of vibrational coherence triggered by an ultrafast phase transition
• Ultrafast Quantum-path Interferometry Revealing the Generation Process of Coherent Phonons
• Ultrafast Control of Crystal Structure in a Topological Charge-Density-Wave Material
• Optical amplification in a CDW-phase of a quasi-two dimensional material

Cited by in corpus (4)

• Femtosecond trimer quench cycled at megahertz rates in the unconventional charge-density wave material $1\text{T’}-{\text{TaTe}}_2$
• Electronic Landscape of Group-5 Transition Metal Ditellurides $M$Te${}_2$ ($M$ = V, Nb, Ta): Multiple Crystal Phases with Local Bonds and Flat Bands
• Anomalous amplitude mode dynamics below the expected charge-density-wave transition in 1$T$-VSe${}_2$
• Photodynamic melting of phase-reversed charge stripes and enhanced condensation