Zobrazeno 1 - 10
of 1 247
pro vyhledávání: '"Woerner M"'
Publikováno v:
EPJ Web of Conferences, Vol 41, p 04002 (2013)
With strong THz pulses, we measure ultrafast transport of electrons, holes, and an electron-hole plasma in GaAs. The transition from ballistic to drift-like transport is strongly influenced by electron-hole scattering.
Externí odkaz:
https://doaj.org/article/54d4ccd6d17d4582ac982cd33f73c84a
Publikováno v:
EPJ Web of Conferences, Vol 41, p 12004 (2013)
We demonstrate the rotating-crystal method in femtosecond x-ray diffraction. Structural dynamics of a photoexcited bismuth crystal is mapped in a pump-probe scheme by measuring intensity changes of many Bragg reflections simultaneously.
Externí odkaz:
https://doaj.org/article/ecde3e35fc894d78af46274a43331406
Publikováno v:
EPJ Web of Conferences, Vol 41, p 04024 (2013)
With two-dimensional THz spectroscopy the dynamics of low-energy carriers in graphene is determined. Both intra- and interband absorption contribute to the observed ultrafast pump-probe signals.
Externí odkaz:
https://doaj.org/article/96df0269d96f4be290b5e2c1e69539e0
Publikováno v:
EPJ Web of Conferences, Vol 41, p 05046 (2013)
Transient electron density maps are derived from x-ray diffraction patterns of photoexcited [Fe(bpy)3]2+(PF6−)2 powder. Upon photoexcitation, the 5T2 quintet state reveals a charge transfer from the PF6− ions and from the Fe atoms to neighboring
Externí odkaz:
https://doaj.org/article/d85139ee1523456498d369c0903af5e9
Publikováno v:
EPJ Web of Conferences, Vol 41, p 03021 (2013)
Transient electron density maps of potassium dihydrogen phosphate(KH2PO4, KDP) are derived from femtosecond x-ray powder diffraction patterns. Upon photoexcitation, the low-frequency TO soft mode is elongated impulsively and modulates the electronic
Externí odkaz:
https://doaj.org/article/d2a1709eaca84c5dba25dbfa41c9f528
Publikováno v:
In Powder Technology November 2022 412
Publikováno v:
In Computer Physics Communications March 2019 236:72-85
Autor:
Babushkin, I., Kuehn, W., Koehler, C., Skupin, S., Berge, L., Reimann, K., Woerner, M., Herrmann, J., Elsaesser, T.
Publikováno v:
Phys. Rev. Lett. 105, 053903 (2010)
We present a combined theoretical and experimental study of spatio-temporal propagation effects in terahertz (THz) generation in gases using two-color ionizing laser pulses. The observed strong broadening of the THz spectra with increasing gas pressu
Externí odkaz:
http://arxiv.org/abs/1003.1900
Publikováno v:
Physical Review B 73, 245320 (2006)
We present a viewpoint of the transport process in quantum cascade laser structures in which spatial transport of charge through the structure is a property of coherent quantum-mechanical wavefunctions. In contrast, scattering processes redistribute
Externí odkaz:
http://arxiv.org/abs/cond-mat/0507410
Autor:
Fink, V., Cai, X., Stroh, A., Bernard, R., Kriegseis, J., Frohnapfel, B., Marschall, H., Wörner, M.
Publikováno v:
In International Journal of Heat and Fluid Flow April 2018 70:271-278