Zobrazeno 1 - 10
of 1 325
pro vyhledávání: '"Betz, M."'
Spin helices in GaAs quantum wells: Interplay of electron density, spin diffusion, and spin lifetime
To establish a correlation between the spin diffusion, the spin lifetime, and the electron density, we study, employing time-resolved magneto-optical Kerr effect microscopy, the spin polarization evolution in low-dimensional GaAs semiconductors hosti
Externí odkaz:
http://arxiv.org/abs/2206.03920
Publikováno v:
Phys. Rev. B 104, 085201 (2021)
We experimentally and theoretically investigate the non-degenerate two-photon absorption coefficient $\beta(\omega_1,\omega_2)$ in the prototypical semiconductor ZnSe. In particular, we provide a comprehensive data set on the dependence of $\beta(\om
Externí odkaz:
http://arxiv.org/abs/2105.10734
The coax based MO distribution system in the ALS is going to be replaced by a modernized, lower phase noise and more interference tolerant version, ready to support ALS-U operation. System aspects are shown and several commercial analog and digital o
Externí odkaz:
http://arxiv.org/abs/1910.07111
Autor:
Passmann, F., Anghel, S., Tischler, T., Poshakinskiy, A. V., Tarasenko, S. A., Karczewski, G., Wojtowicz, T., Bristow, A. D., Betz, M.
Publikováno v:
Phys. Rev. B 97, 201413 (2018)
Time-resolved Kerr-rotation microscopy explores the influence of optical doping on the persistent spin helix in a [001]-grown CdTe quantum well at cryogenic temperatures. Electron spin diffusion dynamics reveal a momentum-dependent effective magnetic
Externí odkaz:
http://arxiv.org/abs/1803.10644
Autor:
Anghel, S., Passmann, F., Singh, A., Ruppert, C., Poshakinskiy, A. V., Tarasenko, S. A., Moore, J. N., Yusa, G., Mano, T., Noda, T., Li, X., Bristow, A. D., Betz, M.
Publikováno v:
Phys. Rev. B 97, 125410 (2018)
Electron spin transport and dynamics are investigated in a single, high-mobility, modulation-doped, GaAs quantum well using ultrafast two-color Kerr-rotation micro-spectroscopy, supported by qualitative kinetic theory simulations of spin diffusion an
Externí odkaz:
http://arxiv.org/abs/1708.09150
Autor:
Armengaud, E., Avignone, F. T., Betz, M., Brax, P., Brun, P., Cantatore, G., Carmona, J. M., Carosi, G. P., Caspers, F., Caspi, S., Cetin, S. A., Chelouche, D., Christensen, F. E., Dael, A., Dafni, T., Davenport, M., Derbin, A. V., Desch, K., Diago, A., Döbrich, B., Dratchnev, I., Dudarev, A., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Galán, J., García, J. A., Garza, J. G., Geralis, T., Gimeno, B., Giomataris, I., Gninenko, S., Gómez, H., González-Díaz, D., Guendelman, E., Hailey, C. J., Hiramatsu, T., Hoffmann, D. H. H., Horns, D., Iguaz, F. J., Irastorza, I. G., Isern, J., Imai, K., Jakobsen, A. C., Jaeckel, J., Jakovčić, K., Kaminski, J., Kawasaki, M., Karuza, M., Krčmar, M., Kousouris, K., Krieger, C., Lakić, B., Limousin, O., Lindner, A., Liolios, A., Luzón, G., Matsuki, S., Muratova, V. N., Nones, C., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Raffelt, G., Redondo, J., Ringwald, A., Russenschuck, S., Ruz, J., Saikawa, K., Savvidis, I., Sekiguchi, T., Semertzidis, Y. K., Shilon, I., Sikivie, P., Silva, H., Kate, H. ten, Tomas, A., Troitsky, S., Vafeiadis, T., van Bibber, K., Vedrine, P., Villar, J. A., Vogel, J. K., Walckiers, L., Weltman, A., Wester, W., Yildiz, S. C., Zioutas, K.
Publikováno v:
JINST 9 (2014) T05002
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO will look for axions or axion-like particles (ALPs) originating in the Sun via the Primakoff conversion of the solar plasma phot
Externí odkaz:
http://arxiv.org/abs/1401.3233
Publikováno v:
Phys. Rev. D 88, 075014 (2013)
The CERN Resonant WISP Search (CROWS) probes the existence of Weakly Interacting Sub-eV Particles (WISPs) like axions or hidden sector photons. It is based on the principle of an optical light shining through the wall experiment, adapted to microwave
Externí odkaz:
http://arxiv.org/abs/1310.8098
To detect or exclude the existence of hidden sector photons or axion like particles, a table-top "microwaves shining through the wall" experiment has been set up at CERN. An overview of the experimental layout is given, the technical challenges invol
Externí odkaz:
http://arxiv.org/abs/1309.7373
"Light Shining Through the Wall" experiments can probe the existence of "axion like particles" through their weak coupling to photons. We have adapted such an experiment to the microwave regime and constructed the table top apparatus. This work prese
Externí odkaz:
http://arxiv.org/abs/1309.0341
A microwave paraphoton and axion detection experiment with 300 dB electromagnetic shielding at 3 GHz
Autor:
Betz, M., Caspers, F.
For the microwave equivalent of "light shining through the wall" (LSW) experiments, a sensitive microwave detector and very high electromagnetic shielding is required. The screening attenuation between the axion generating cavity and the nearby detec
Externí odkaz:
http://arxiv.org/abs/1207.3275