Terahertz driven extremely nonlinear bulk photogalvanic currents in non-resonant conditions

  title={Terahertz driven extremely nonlinear bulk photogalvanic currents in non-resonant conditions},
  author={Ofer Neufeld and Nicolas Tancogne-Dejean and Umberto De Giovannini and Hannes Hubener and {\'A}ngel Rubio},
  journal={arXiv: Materials Science},
We report on the generation of bulk photocurrents in materials driven by non-resonant bi-chromatic fields that are circularly polarized and co-rotating. The nonlinear photocurrents have a fully controllable directionality and amplitude without requiring carrier-envelope-phase stabilization or few-cycle pulses, and are generated with photon energies much smaller than the band gap (reducing heating in the photo-conversion process). We demonstrate with ab-initio calculations that the photocurrent… 

Figures from this paper



Light-field-driven currents in graphene

Graphene is a promising platform with which to achieve light-field-driven control of electrons in a conducting material, because of its broadband and ultrafast optical response, weak screening and high damage threshold, and it is shown that a current induced in monolayer graphene by two-cycle laser pulses is sensitive to the electric-field waveform.

Few-cycle lightwave-driven currents in a semiconductor at high repetition rate

When an intense, few-cycle light pulse impinges on a dielectric or semiconductor material, the electric field will interact nonlinearly with the solid, driving a coherent current. An asymmetry of the

Lightwave control of topological properties in 2D materials for sub-cycle and non-resonant valley manipulation

Modern light generation technology offers extraordinary capabilities for sculpting light pulses, with full control over individual electric field oscillations within each laser cycle [1]. These

Sub-cycle temporal evolution of light-induced electron dynamics in hexagonal 2D materials

Two-dimensional materials with hexagonal symmetry such as graphene and transition metal dichalcogenides are unique materials to study light-field-controlled electron dynamics inside of a solid.

Light-induced valleytronics in pristine graphene

Electrons in two-dimensional hexagonal materials have valley degree of freedom, which can be used to encode and process quantum information. The valley-selective excitations, governed by the

Coherent control of injection currents in high-quality films of Bi2Se3

Films of the topological insulator Bi2Se3 are grown by molecular beam epitaxy with in-situ reflection high-energy electron diffraction. The films are shown to be high-quality by X-ray reflectivity

Topological strong-field physics on sub-laser-cycle timescale

The sub-laser-cycle timescale of the electronic response to strong fields enables attosecond dynamical imaging in atoms, molecules and solids1–4, with optical tunnelling and high-harmonic generation

Shift current bulk photovoltaic effect in polar materials—hybrid and oxide perovskites and beyond

The bulk photovoltaic effect (BPVE) refers to the generation of a steady photocurrent and above-bandgap photovoltage in a single-phase homogeneous material lacking inversion symmetry. The mechanism

Light-induced anomalous Hall effect in graphene

The observation of a light-induced anomalous Hall effect in monolayer graphene driven by a femtosecond pulse of circularly polarized light reveals multiple features that reflect a Floquet-engineered topological band structure similar to the band structure originally proposed by Haldane 10 .

Perovskite oxides for visible-light-absorbing ferroelectric and photovoltaic materials

The ability of KBNNO to absorb three to six times more solar energy than the current ferroElectric materials suggests a route to viable ferroelectric semiconductor-based cells for solar energy conversion and other applications.