57 citations · 235 across the 12 of their papers we have counts for
12 papers
Light-induced effective magnetic fields in Landau quantized graphene
Hiroki Ueda, Alexej Pashkin, Ece Uykur +6
Ultrafast magnetism triggered by circularly polarized radiation underpins ultrafast spin control, relevant to future technologies, e.g., opto-spintronics and magnonics. The dynamic…
Revisiting the symmetry and optical phonons of altermagnetic -MnTe
Ece Uykur, Marcos V. Gonçalves-Faria, Sahana Rößler +5
Using infrared (IR) and Raman spectroscopies combined with high-resolution x-ray diffraction, we address several controversial aspects of altermagnetic -MnTe. We show that mecha…
High-pressure modulation of breathing kagome lattice: Cascade of Lifshitz transitions and evolution of the electronic structure
Marcos V. Gonçalves-Faria, Maxim Wenzel, Yuk Tai Chan +12
The interplay between electronic correlations, density wave orders, and magnetism gives rise to several fascinating phenomena. In recent years, kagome metals have emerged as an exc…
Simple THz phase retarder based on Mach-Zehnder interferometer for polarization control
Hiroki Ueda, Alexej Pashkin, Ece Uykur +2
On-demand polarization control of electromagnetic waves is the fundamental element of modern optics. Its interest has recently been expanded in the terahertz (THz) range for cohere…
Highly efficient broadband THz upconversion with Dirac materials
Tatiana A. Uaman Svetikova, Igor Ilyakov, Alexey Ponomaryov +16
The use of the THz frequency domain in future network generations offers an unparalleled level of capacity, which can enhance innovative applications in wireless communication, ana…
Hot electron dynamics in a semiconductor nanowire under intense THz excitation
Andrei Luferau, Maximilian Obst, Stephan Winnerl +8
We report THz-pump / mid-infrared probe near-field studies on Si-doped GaAs-InGaAs core-shell nanowires utilizing THz radiation from the free-electron laser FELBE. Upon THz excitat…
Coherent phonon and unconventional carriers in the magnetic kagome metal FeSn
M. V. Gonçalves-Faria, A. Pashkin, Q. Wang +5
Temperature- and fluence-dependent carrier dynamics of the magnetic Kagome metal FeSn were studied using the ultrafast optical pump-probe technique. Two carrier relaxation…
Terahertz control of photoluminescence emission in few-layer InSe
Tommaso Venanzi, Malte Selig, Alexej Pashkin +11
A promising route for the development of opto-elelctronic technology is to use terahertz radiation to modulate the optical properties of semiconductors. Here we demonstrate the dyn…
Slow noncollinear Coulomb scattering in the vicinity of the Dirac point in graphene
J. C. König-Otto, M. Mittendorff, T. Winzer +9
The Coulomb scattering dynamics in graphene in energetic proximity to the Dirac point is investigated by polarization resolved pump-probe spectroscopy and microscopic theory. Colli…
Melting the Superconducting State in the Electron Doped Cuprate PrCeCuO with Intense near-infrared and Terahertz Pulses
M. Beck, M. Klammer, I. Rousseau +8
We studied the superconducting (SC) state depletion process in an electron doped cuprate PrCeCuO by pumping with near-infrared (NIR) and narrow-band THz p…
Microscopic description of intraband absorption in graphene: the occurrence of transient negative differential transmission
Faris Kadi, Torben Winzer, Ermin Malic +1
We present a microscopic explanation of the controversially discussed transient negative differential transmission observed in degenerate optical pump-probe measurements in graphen…
Universal phase relation between longitudinal and transverse fields observed in focused terahertz beams
S. Winnerl, R. Hubrich, M. Mittendorff +2
We directly observe longitudinal electromagnetic fields in focused freely propagating terahertz beams of radial and linear polarization. In accordance with theory, the longitudinal…