59 citations · 164 across the 12 of their papers we have counts for
12 papers
Anharmonic phonon coupling enabled by local inversion symmetry breaking at domain walls in ferroelastics
Seyyed Jabbar Mousavi, Vivek Unikandanunni, Niccolo Sellati +7
In ferroelastic materials, spontaneous symmetry breaking leads to the formation of twin domains. Although the bulk crystal typically remains centrosymmetric, inversion symmetry can…
Uniaxial strain-driven ferroelastic domain control in LaAlO3
Matthias Roeper, Robin Buschbeck, Jakob Wetzel +15
Multiferroic domain walls in functional oxides exhibit properties distinct from the bulk and are increasingly exploited as active elements in nanoelectronic and photonic devices. D…
Intrinsic non-Markovian magnetisation dynamics
Felix Hartmann, Vivek Unikandanunni, Matias Bargheer +3
Memory effects are widespread in complex systems while evidence of non-Markovian dynamics in fundamental physical systems has been limited to specifically engineered cases. Here we…
Terahertz-driven parametric excitation of Raman-active phonons in LaAlO
M. Basini, V. Unikandanunni, F. Gabriele +7
Achieving parametric excitation in an oscillating physical system involves periodically adjusting one of its parameters to modulate the oscillator's natural frequency. This phenome…
Ultrafast terahertz field control of the emergent magnetic and electronic interactions at oxide interfaces
A. M. Derrico, M. Basini, V. Unikandanunni +13
Ultrafast electric-field control of emergent electronic and magnetic states at oxide interfaces offers exciting prospects for the development of new generations of energy-efficient…
Characterizing the Nonequilibrium Response of FeRh Thin Films using Time-Domain Thermoreflectance (TDTR)
Renee M. Harton, Alejandro Ceballos, Vivek Unikandanunni +4
Time-Domain Thermoreflectance (TDTR) characterization of FeRh throughout its first-order antiferromagnetic (AF) to ferromagnetic (FM) transition shows that the transient reflectanc…
Terahertz ionic Kerr effect: Two-phonon contribution to the nonlinear optical response in insulators
Martina Basini, Mattia Udina, Matteo Pancaldi +3
The THz Kerr effect measures the birefringence induced in an otherwise isotropic material by a strong THz pulse driving the Raman-active excitations of the systems. Here we provide…
Inertial spin dynamics in epitaxial cobalt films
Vivek Unikandanunni, Rajasekhar Medapalli, Marco Asa +5
We investigate the spin dynamics driven by terahertz magnetic fields in epitaxial thin films of cobalt in its three crystalline phases. The terahertz magnetic field generates a tor…
Ultrafast electron dynamics in platinum and gold thin films driven by optical and terahertz fields
Vivek Unikandanunni, Matthias C. Hoffmann, Paolo Vavassori +2
We investigate the ultrafast electron dynamics triggered by terahertz and optical pulses in thin platinum and gold films by probing their transient optical reflectivity. The respon…
Nanoscale transient magnetization gratings excited and probed by femtosecond extreme ultraviolet pulses
D. Ksenzov, A. A. Maznev, V. Unni +15
We utilize coherent femtosecond extreme ultraviolet (EUV) pulses derived from a free electron laser (FEL) to generate transient periodic magnetization patterns with periods as shor…
Anisotropic Ultrafast Spin Dynamics in Epitaxial Cobalt
Vivek Unikandanunni, Rajasekhar Medapalli, Eric E. Fullerton +3
We investigate the ultrafast spin dynamics in an epitaxial hcp(1100) cobalt thin film. By performing pump-probe magneto-optical measurements with the magnetization along either the…
NTMpy: An open source package for solving coupled parabolic differential equations in the framework of the three-temperature model
Lukas Alber, Valentino Scalera, Vivek Unikandanunni +2
The NTMpy code package allows for simulating the one-dimensional thermal response of multilayer samples after optical excitation, as in a typical pump-probe experiment. Several Pyt…