19 citations · 49 across the 10 of their papers we have counts for
11 papers
Magnetic permeability and zone-folded phonons in layered NiPS
André A. A. Silva, Eduardo D. Stefanato, Nicolas M. Kawahala +8
Nickel phosphorus trisulfide (NiPS) stands out as a Mott insulator exhibiting XY-type antiferromagnetic order. In this work, we investigate the electrodynamic response of singl…
Terahertz Lattice Imprint of a Hidden Multipolar Ordering Transition in GdRuO
Nicolas M. Kawahala, Rafael L. Sabainsk, Esteban Marulanda +2
Magnetic order carried by higher-rank multipoles produces no net moment and couples only weakly to conventional dipolar probes. Recently, the lattice has been proposed as an altern…
Colossal Terahertz Magnetoresistance from Magnetic Polarons in EuZnP
E. Marulanda, M. Dutra, N. M. Kawahala +5
Magnetic polarons can generate colossal magnetoresistance in magnetic semiconductors, yet their terahertz electrodynamics remain largely unexplored. Here we report magneto-terahert…
Engineering a Correlated Narrow-Gap Semiconductor: Effects of Ga Substitution in EuZnP
M. Dutra, E. Marulanda, G. G. Vasques +11
The effect of Ga substitution on the electronic, magnetic, and low-energy responses of the Zintl phase EuZnP is investigated by electrical transport, electron spin resonanc…
Windowing in terahertz time-domain spectroscopy: resolving resonances in thin-film samples
Esteban Marulanda, Fernanda L. Costa, Nicolas M. Kawahala +1
Terahertz time-domain spectroscopy (THz-TDS) has become a powerful tool for investigating the optical properties of thin films, offering direct access to the complex permittivity i…
Optimizing Aperture Geometry in THz-TDS for Accurate Spectroscopy of Quantum Materials
Laura O. Dias, Eduardo D. Stefanato, Nicolas M. Kawahala +1
Terahertz time-domain spectroscopy (THz-TDS) provides a powerful platform for investigating low-energy excitations in quantum materials. Because these materials are often limited i…
Metallicity-driven polar transitions in topological epilayers
Eduardo D. Stefanato, Nicolas M. Kawahala, Bianca A. Kawata +3
Polar metals, materials that exhibit both electric polarization and high conductivity, can also host topological phases. Because free carriers strongly suppress distortive polar or…
Shaping terahertz waves using anisotropic shear modes in a van der Waals mineral
Nicolas M. Kawahala, Daniel A. Matos, Raphaela de Oliveira +4
Naturally occurring van der Waals (vdW) materials are currently attracting significant interest due to their potential as low-cost sources of two-dimensional materials. Valuable in…
Electrical control of spin relaxation anisotropy during drift transport in a two-dimensional electron gas
F. G. G. Hernandez, G. J. Ferreira, M. Luengo-Kovac +4
Spin relaxation was studied in a two-dimensional electron gas confined in a wide GaAs quantum well. Recently, the control of the spin relaxation anisotropy by diffusive motion was…
Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet
N. M . Kawahala, F. C. D. Moraes, G. M. Gusev +2
Spin transport was studied in a two-dimensional electron gas hosted in a wide GaAs quantum well occupying two subbands. Using space and time Kerr rotation microscopy to image drift…
Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases
F. G. G. Hernandez, S. Ullah, G. J. Ferreira +3
We imaged the transport of current-induced spin coherence in a two-dimensional electron gas confined in a triple quantum well. Nonlocal Kerr rotation measurements, based on the opt…