803 citations · 2.6k across the 37 of their papers we have counts for
37 papers
Complex Refractive Index Extraction for Spintronic Terahertz Emitter Analysis
Yingshu Yang, Keynesh Dongol, Stefano Dal Forno +7
Spintronic terahertz emitters (STEs) generate broadband terahertz (THz) radiation, which is essential for spectroscopy, imaging, and communication. The performances and the essenti…
Exciton lasing in carbon nanotubes below the population inversion threshold via phonon-mediated stimulated emission
Stefano Dal Forno, Marco Battiato
Excitonic optical transitions in carbon nanotubes (CNTs) have been extensively studied for at least two decades. However, exploiting these transitions to produce a lasing effect ha…
Transition from Diffusive to Superdiffusive Transport in Carbon Nanotube Networks via Nematic Order Control
Michael Wais, Filchito Renee G. Bagsican, Natsumi Komatsu +8
The one-dimensional confinement of quasiparticles in individual carbon nanotubes (CNTs) leads to extremely anisotropic electronic and optical properties. In a macroscopic ensemble…
Modelling of Spintronic Terahertz Emitters as a function of spin generation and diffusion geometry
Yingshu Yang, Stefano Dal Forno, Marco Battiato
Spintronic THz emitters (STE) are efficient THz sources constructed using thin heavy-metal (HM) and ferromagnetic-metal (FM) layers. To improve the performance of the STE, differen…
Secondary spin current driven efficient THz spintronic emitters
Piyush Agarwal, Yingshu Yang, Rohit Medwal +4
Femtosecond laser-induced photoexcitation of ferromagnet (FM)/heavy metal (HM) heterostructures have attracted attention by emitting broadband terahertz frequencies. The phenomenon…
From rogue waves to solitons
Amdad Chowdury, Wonkeun Chang, Marco Battiato
Using a generalized nonlinear Schrödinger equation, we investigate the transformation of a fundamental rogue wave to a collection of solitons. Taking the third-order dispersion, se…
Higher-order rogue wave fission under the effects of third-order dispersion, self-steepening and self-frequency shift
Amdad Chowdury, Wonkeun Chang, Marco Battiato
Using the generalised nonlinear Schrödinger equation, we investigate how the effect of third-order dispersion, self-steepening, and Raman-induced-self-frequency shift have an impac…
Perturbative Transfer Matrix Method for optical-pump-THz-probe of ultrafast dynamics
Yingshu Yang, Stefano Dal Forno, Marco Battiato
Ultrafast optical excitations trigger in materials a range of dynamics. An interesting range of dynamics is the ones that unfold within the picosecond timescale, corresponding to t…
Spatiotemporal pattern formation in nonlinear coupled reaction-diffusion systems with a mixed-type modal discontinuous Galerkin approach
Satyvir Singh, Marco Battiato, Vinesh Kumar
The nonlinear coupled reaction-diffusion (NCRD) systems are important in the formation of spatiotemporal patterns in many scientific and engineering fields, including physical and…
Transfer Matrix description of heterostructured spintronics Terahertz emission
Yingshu Yang, Stefano Dal Forno, Marco Battiato
In this work we developed an extension to the Transfer Matrix method (TMM) to include a current source term, with the aim of describing both the transmission and emission of THz pu…
Origin of the Background Absorption in Carbon Nanotubes: Phonon-Assisted Excitonic Continuum
Stefano Dal Forno, Natsumi Komatsu, Michael Wais +8
Excitonic effects in 1D semiconductors can be qualitatively different from those in higher dimensions. In particular, the Sommerfeld factor, the ratio of the above-band-edge excito…
Numerical Solver for the out-of-equilibrium time dependent Boltzmann Collision operator: Application to 2D materials
Indrajit Wadgaonkar, Michael Wais, Marco Battiato
The Time Dependent Boltzmann equation (TDBE) is a viable option to study strongly out-of-equilibrium thermalization dynamics which are becoming increasingly critical for many novel…
Comparing scattering rates from Boltzmann and dynamical mean-field theory
M. Wais, J. Kaufmann, M. Battiato +1
We compute scattering rates for electrons in the two-dimensional Hubbard model for a one-orbital metal and a two-orbital band insulator by means of the Boltzmann scattering equatio…
Numerical scheme for the far-out-of-equilibrium time-dependent Boltzmann collision operator: 1D second-degree momentum discretisation and adaptive time stepping
Indrajit Wadgaonkar, Rishabh Jain, Marco Battiato
Study of far-from-equilibrium thermalization dynamics in quantum materials, including the dynamics of different types of quasiparticles, is becoming increasingly crucial. However,…
Removal of spectral distortion due to echo for ultrashort pulses propagating through multilayer structures with thick substrate
Yingshu Yang, Stefano Dal Forno, Marco Battiato
Given the wide range of applications of time-domain spectroscopy, and particularly THz time-domain spectroscopy, the modelling of a probe pulse propagating through a multilayered s…
Terahertz Excitonics in Carbon Nanotubes: Exciton Autoionization and Multiplication
Filchito Renee G. Bagsican, Michael Wais, Natsumi Komatsu +10
Excitons play major roles in optical processes in modern semiconductors, such as single-wall carbon nanotubes (SWCNTs), transition metal dichalcogenides, and 2D perovskite quantum…
Numerical solver for the time-dependent far-from-equilibrium Boltzmann equation
Michael Wais, Karsten Held, Marco Battiato
The study of strongly out-of-equilibrium states and their time evolution towards thermalization is critical to the understanding of an ever widening range of physical processes. We…
Interface reflectivity of a superdiffusive spin current in ultrafast demagnetization and THz emission
Wen-Tian Lu, Yawen Zhao, Marco Battiato +2
The spin- and energy-dependent interface reflectivity of a ferromagnetic (FM) film in contact with a nonmagnetic (NM) film is calculated using a first-principles transport method a…
Analysis of the linear relationship between asymmetry and magnetic moment at the M-edge of 3d transition metals
Somnath Jana, R. S. Malik, Yaroslav O. Kvashnin +11
The magneto-optical response of Fe and Ni during ultrafast demagnetization is studied experimentally and theoretically. We have performed pump-probe experiments in the transverse m…
Modification of spintronic terahertz emitter performance through defect engineering
Dennis M. Nenno, Laura Scheuer, Dominik Sokoluk +10
Spintronic ferromagnetic/non-magnetic heterostructures are novel sources for the generation of THz radiation based on spin-to-charge conversion in the layers. The key technological…
Ultrafast Spin-To-Charge Conversion at the Surface of Topological Insulator Thin Films
Xinbo Wang, Liang Cheng, Dapeng Zhu +11
Strong spin-orbit coupling, resulting in the formation of spin-momentum-locked surface states, endows topological insulators with superior spin-to-charge conversion characteristics…
Impact of ultrafast transport on the high-energy states of a photoexcited topological insulator
F. Freyse, M. Battiato, L. V. Yashina +1
Ultrafast dynamics in three-dimensional topological insulators (TIs) opens new routes for increasing the speed of information transport up to frequencies thousand times faster than…
Quantum Boltzmann equation for strongly correlated systems: comparison to dynamical mean field theory
Michael Wais, Martin Eckstein, Roland Fischer +3
We investigate the potential of a quantum Boltzmann equation without momentum conservation for description of strongly correlated electron systems out of equilibrium. In a spirit s…
Spin polarisation of ultrashort spin current pulses injected in semiconductors
Marco Battiato
Ultrashort spin current pulses have a great potential of becoming the carriers of information in future ultrafast spintronics. They present the outstanding property of an extremely…