Since the pioneering works by Landau, Zener, Stückelberg, and Majorana (LZSM), it has
been known that driving a quantum two-level system results in tunneling between its states …

Petahertz, or lightwave, electronics uses tailored optical waveforms to control charge
carriers in an electronic circuit at petahertz frequencies. This may enable faster processing …

Electrons in two-dimensional hexagonal materials have an extra degree of freedom, the
valley pseudospin, that can be used to encode and process quantum information. Valley …

With its linear energy dispersion and large transition dipole matrix element, graphene is an
attractive material for nonlinear optoelectronic applications. However, the mechanistic origin …

We review recent work on low-frequency Floquet engineering and its application to quantum
materials driven by light, focusing on van der Waals systems hosting Moiré superlattices …

Irradiating solids with ultrashort laser pulses is known to initiate femtosecond timescale
magnetization dynamics. However, sub-femtosecond spin dynamics have not yet been …

For gapped graphene, we predict that an intense ultrashort (single-oscillation) circularly
polarized optical pulse can induce a large population of the conduction band and a large …

High-harmonic spectroscopy of solids is a powerful tool, which provides access to both
electronic structure and ultrafast electronic response of solids, from their band structure and …

High-order frequency mixing in graphene using a two-color radiation field consisting of the
fundamental and the second harmonic fields of an ultrashort linearly polarized laser pulse is …

We predict the generation of bulk photocurrents in materials driven by bichromatic fields that
are circularly polarized and corotating. The nonlinear photocurrents have a fully controllable …