Zobrazeno 1 - 10
of 1 752
pro vyhledávání: '"Pashkin, A."'
Autor:
Bernhardt, Felix, Gharat, Soham, Kapp, Alexander, Pfeiffer, Florian, Buschbeck, Robin, Hempel, Franz, Pashkin, Oleksiy, Kehr, Susanne C., Rüsing, Michael, Sanna, Simone, Eng, Lukas M.
Lithium niobate (LNO) and lithium tantalate (LTO) see widespread use in fundamental research and commercial technologies reaching from electronics over classical optics to integrated quantum communication. In recent years, the mixed crystal system li
Externí odkaz:
http://arxiv.org/abs/2403.17594
Autor:
Luferau, Andrei, Obst, Maximilian, Winnerl, Stephan, Pashkin, Alexej, Kehr, Susanne C., Dimakis, Emmanouil, Kaps, Felix G., Hatem, Osama, Mavridou, Kalliopi, Eng, Lukas M., Helm, Manfred
Publikováno v:
ACS Photonics 11, 3123 (2024)
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 excitation of free carriers, we observe a red shift of the plasma resonance i
Externí odkaz:
http://arxiv.org/abs/2403.17195
Autor:
Sobolev, Sergei, Lanz, Amon, Dong, Tao, Pokharel, Amrit, Kabanov, Viktor, Xu, Tie-Quan, Wang, Yue, Gan, Zi-Zhao, Shi, L. Y., Wang, Nan-Lin, Pashkin, Alexej, Uykur, Ece, Winnerl, Stephan, Helm, Manfred, Demsar, Jure
We study THz-driven condensate dynamics in epitaxial thin films of MgB$_{2}$, a prototype two-band superconductor (SC) with weak interband coupling. The temperature and excitation density dependent dynamics follow the behavior predicted by the phenom
Externí odkaz:
http://arxiv.org/abs/2308.00775
Autor:
Gonçalves-Faria, M. V., Pashkin, A., Wang, Q., Lei, H. C., Winnerl, S., Tsirlin, A. A., Helm, M., Uykur, E.
Temperature- and fluence-dependent carrier dynamics of the magnetic Kagome metal Fe$_3$Sn$_2$ were studied using the ultrafast optical pump-probe technique. Two carrier relaxation processes ($\tau_1$ and $\tau_2$) and a laser induced coherent optical
Externí odkaz:
http://arxiv.org/abs/2307.05139
Autor:
Fotev, Ivan, Winnerl, Stephan, Aswartham, Saicharan, Wurmehl, Sabine, Büchner, Bernd, Schneider, Harald, Helm, Manfred, Pashkin, Alexej
Publikováno v:
Phys. Rev. B 108, 035101 (2023)
BaFe$_2$As$_2$ is the parent compound for a family of iron-based high-temperature superconductors as well as a prototypical example of the spin-density wave (SDW) system. In this study, we perform an optical pump-probe study of this compound to syste
Externí odkaz:
http://arxiv.org/abs/2304.08080
Autor:
Im, H., Lee, D. U., Jo, Y., Kim, J., Chong, Y., Song, W., Kim, H., Kim, E. K., Sin, S. -J., Moon, S., Prance, J. R., Pashkin, Yu. A., Tsai, J. S.
When a magnetic moment is embedded in a metal, it captures itinerant electrons to form the Kondo cloud1,2, which can spread out over a few micrometres3,4. For a metal with dense magnetic impurities such that Kondo clouds overlap with each other, corr
Externí odkaz:
http://arxiv.org/abs/2301.09047
Autor:
Wang, Mao, Yu, Ye, Prucnal, Slawomir, Berencén, Yonder, Shaikh, Mohd Saif, Rebohle, Lars, Khan, Muhammad Bilal, Zviagin, Vitaly, Hübner, René, Pashkin, Alexej, Erbe, Artur, Georgiev, Yordan M., Grundmann, Marius, Helm, Manfred, Kirchner, Robert, Zhou, Shengqiang
Publikováno v:
Nanoscale 14, 2826-2836 (2022)
Plasmonic sensing in the infrared region employs the direct interaction of the vibrational fingerprints of molecules with the plasmonic resonances, creating surface-enhanced sensing platforms that are superior than the traditional spectroscopy. Howev
Externí odkaz:
http://arxiv.org/abs/2210.03373
Publikováno v:
Phys. Rev. B 107, 184302 (2023)
We investigate coherent lattice dynamics in optimally doped YBa$_2$Cu$_3$O$_{7-\delta}$ driven by ultrashort ($\sim$ 12 fs) near infrared (NIR) and near ultraviolet (NUV) pulses. Transient reflectivity experiments, performed at room temperature and u
Externí odkaz:
http://arxiv.org/abs/2210.01983
Autor:
Autti, S., Bettsworth, F. C., Grigoras, K., Gunnarsson, D., Haley, R. P., Jones, A. T., Pashkin, Yu. A., Prance, J. R., Prunnila, M., Thompson, M. D., Zmeev, D. E.
On-chip demagnetization refrigeration has recently emerged as a powerful tool for reaching microkelvin electron temperatures in nanoscale structures. The relative importance of cooling on-chip and off-chip components and the thermal subsystem dynamic
Externí odkaz:
http://arxiv.org/abs/2209.07099
Hybrid turnstiles have proven to generate accurate single-electron currents. The usual operation consists of applying a periodic modulation to a capacitively coupled gate electrode and requires a non-zero DC source-drain bias voltage. Under this oper
Externí odkaz:
http://arxiv.org/abs/2207.14249