415 citations · 2.3k across the 47 of their papers we have counts for
20 papers · 1 filter
First-principles modelling for time-resolved ARPES under different pump-probe conditions
Umberto De Giovannini, Shunsuke A. Sato, Hannes Hübener +1
First-principles methods for time-resolved angular resolved photoelectron spectroscopy play a pivotal role in providing interpretation and microscopic understanding of the complex…
Two-step Brillouin zone sampling for efficient computation of electron dynamics in solids
Shunsuke A. Sato
We develop a numerical Brillouin-zone integration scheme for real-time propagation of electronic systems with time-dependent density functional theory. This scheme is based on the…
On the survival of Floquet-Bloch states in the presence of scattering
S. Aeschlimann, S. A. Sato, R. Krause +9
Floquet theory has spawned many exciting possibilities for electronic structure control with light with enormous potential for future applications. The experimental realization in…
The Ferroelectric Photo-Groundstate of SrTiO: Cavity Materials Engineering
Simone Latini, Dongbin Shin, Shunsuke A. Sato +4
Optical cavities confine light on a small region in space which can result in a strong coupling of light with materials inside the cavity. This gives rise to new states where quant…
The quantum paraelectric phase of SrTiO from first principles
Dongbin Shin, Simone Latini, Christian Schäfer +4
We demonstrate how the quantum paraelectric ground state of SrTiO can be accessed via a microscopic approach based on density functional theory. At low temperature…
First-principles calculations for attosecond electron dynamics in solids
Shunsuke A. Sato
Nonequilibrium electron dynamics in solids is an important subject from both fundamental and technological points of view. The recent development of laser technology has enabled us…
Nonlinear phononics in 2D SnTe: a ferroelectric material with phonon dynamical amplification of electric polarization
Dongbin Shin, Shunsuke A. Sato, Hannes Hübener +3
Ultrafast optical control of ferroelectricity using intense terahertz fields has attracted significant interest. Here we show that the nonlinear interactions between two optical ph…
High-order harmonic generation in graphene: nonlinear coupling of intra and interband transitions
Shunsuke A. Sato, Hideki Hirori, Yasuyuki Sanari +2
We investigate high-order harmonic generation (HHG) in graphene with a quantum master equation approach. The simulations reproduce the observed enhancement in HHG in graphene under…
Direct measurement of electron-phonon coupling with time-resolved ARPES
Umberto De Giovannini, Hannes Hübener, Shunsuke A. Sato +1
Time and angular resolved photoelectron spectroscopy is a powerful technique to measure electron dynamics in solids. Recent advances in this technique have facilitated band and ene…
Ab initio simulation of attosecond transient absorption spectroscopy in two-dimensional materials
Shunsuke A. Sato, Hannes Hübener, Umberto De Giovannini +1
We extend the first-principles analysis of attosecond transient absorption spectroscopy to two-dimensional materials. As an example of two-dimensional materials, we apply the analy…
Role of intra-band transitions in photo-carrier generation
Shunsuke A. Sato, Matteo Lucchini, Mikhail Volkov +4
We theoretically investigate the role of intra-band transitions in laser-induced carrier-generation for different photon energy regimes: (i) strongly off-resonant, (ii) multi-photo…
Velocity-gauge real-time TDDFT within a numerical atomic orbital basis set
C. D. Pemmaraju, F. D. Vila, J. J. Kas +4
The interaction of laser fields with solid-state systems can be modeled efficiently within the velocity-gauge formalism of real-time time dependent density functional theory (RT-TD…
Nonlinear electronic excitations in crystalline solids using meta-generalized gradient approximation and hybrid functional in time-dependent density functional theory
Shunsuke A. Sato, Yasutaka Taniguchi, Yasushi Shinohara +1
We develop numerical methods to calculate electron dynamics in crystalline solids in real-time time-dependent density functional theory employing exchange-correlation potentials wh…
Femtosecond time-resolved dynamical Franz-Keldysh effect
T. Otobe, Y. Shinohara, S. A. Sato +1
We theoretically investigate the dynamical Franz-Keldysh effect in femtosecond time resolution, that is, the time-dependent modulation of a dielectric function at around the band g…
Dielectric response of laser-excited silicon at finite electron temperature
S. A. Sato, Y. Shinohara, T. Otobe +1
We calculate the dielectric response of excited crystalline silicon in electron thermal equilibrium by adiabatic time-dependent density functional theory (TDDFT) to model the respo…
Efficient basis expansion for describing linear and nonlinear electron dynamics in crystalline solids
Shunsuke A. Sato, Kazuhiro Yabana
We propose an efficient basis expansion for electron orbitals to describe real-time electron dynamics in crystalline solids. Although a conventional grid representation in the thre…
Ab Initio Simulation of Electrical Currents Induced by Ultrafast Laser Excitation of Dielectric Materials
Georg Wachter, Christoph Lemell, Joachim Burgdörfer +3
We theoretically investigate the generation of ultrafast currents in insulators induced by strong few-cycle laser pulses. Ab initio simulations based on time-dependent density func…
First-principles simulation of the optical response of bulk and thin-film α-quartz irradiated with an ultrashort intense laser pulse
Kyung-Min Lee, Chul Min Kim, Shunsuke A. Sato +4
A computational method based on a first-principles multiscale simulation has been used for calculating the optical response and the ablation threshold of an optical material irradi…
Dielectric response of laser-excited silicon
S. A. Sato, K. Yabana, Y. Shinohara +2
We calculate the dielectric response of crystalline silicon following irradiation by a high-intensity laser pulse, modeling the dynamics by time-dependent density functional theory…
Nonadiabatic generation of coherent phonons
Y. Shinohara, S. A. Sato, K. Yabana +3
The time-dependent density functional theory (TDDFT) is the leading computationally feasible theory to treat excitations by strong electromagnetic fields. Here the theory is applie…