139 citations · 442 across the 7 of their papers we have counts for
7 papers
Electrical tunability of terahertz nonlinearity in graphene
Sergey Kovalev, Hassan A. Hafez, Klaas-Jan Tielrooij +15
Graphene is conceivably the most nonlinear optoelectronic material. Its nonlinear optical coefficients in the terahertz (THz) frequency range surpass those of other materials by ma…
Non-perturbative high-harmonic generation in the three-dimensional Dirac semimetal CdAs
Sergey Kovalev, Renato M. A. Dantas, Semyon Germanskiy +12
Harmonic generation is a general characteristic of driven nonlinear systems, and serves as an efficient tool for investigating the fundamental principles that govern the ultrafast…
Experimental evidence of inertial dynamics in ferromagnets
Kumar Neeraj, Nilesh Awari, Sergey Kovalev +17
The understanding of how spins move at pico- and femtosecond time scales is the goal of much of modern research in condensed matter physics, with implications for ultrafast and mor…
Phase-resolved Higgs response in superconducting cuprates
Hao Chu, Min-Jae Kim, Kota Katsumi +26
In high energy physics, the Higgs field couples to gauge bosons and fermions and gives mass to their elementary excitations. Experimentally, such couplings can be inferred from the…
Magnetic field dependence of antiferromagnetic resonance in NiO
Zhe Wang, S. Kovalev, N. Awari +7
We report on measurements of magnetic field and temperature dependence of antiferromagnetic resonances in the prototypical antiferromagnet NiO. The frequencies of the magnetic reso…
Optical nanoscopy of transient states in condensed matter
Frederik Kuschewski, Susanne C. Kehr, Bert Green +3
Recently, the fundamental and nanoscale understanding of complex phenomena in materials research and the life sciences, witnessed considerable progress. However, elucidating the un…
THz Field Control of In-Plane Orbital Order in La0.5Sr1.5MnO4
Timothy A. Miller, Ravindra W. Chhajlany, Luca Tagliacozzo +6
In-plane anisotropic ground states are ubiquitous in correlated solids such as pnictides, cuprates and manganites. They can arise from doping Mott insulators and compete with phase…