Zobrazeno 1 - 10
of 301
pro vyhledávání: '"Karch J"'
Autor:
Auler, J., Engler, M., Franz, K., Kahlenberg, J., Karch, J., Pfeifer, N., Roß, K., Strid, C. -F., Yazdandoost, N., Adamek, E., Kaufmann, S., Schmidt, Ch., Blümler, P., Fertl, M., Heil, W., Ries, D.
The confinement of ultracold neutrons (UCNs) in a three dimensional magnetic field gradient trap allows for a measurement of the free neutron lifetime with superior control over spurious loss channels and can provide a large kinetic energy acceptance
Externí odkaz:
http://arxiv.org/abs/2311.00712
Autor:
Bison, G., Daum, M., Kirch, K., Lauss, B., Ries, D., Schmidt-Wellenburg, P., Zsigmond, G., Brenner, T., Geltenbort, P., Jenke, T., Zimmer, O., Beck, M., Heil, W., Kahlenberg, J., Karch, J., Ross, K., Eberhardt, K., Geppert, C., Karpuk, S., Reich, T., Siemensen, C., Sobolev, Y., Trautmann, N.
Publikováno v:
Phys. Rev. C 95, 045503 (2017)
Ultracold neutrons (UCNs) are key for precision studies of fundamental parameters of the neutron and in searches for new CP violating processes or exotic interactions beyond the Standard Model of particle physics. The most prominent example is the se
Externí odkaz:
http://arxiv.org/abs/1610.08399
Publikováno v:
J. Phys.: Condens. Matter 26, 255802 (2014)
We report on the observation of magnetic quantum ratchet effect in metal-oxide-semiconductor field-effect-transistors on silicon surface (Si-MOSFETs). We show that the excitation of an unbiased transistor by ac electric field of terahertz radiation a
Externí odkaz:
http://arxiv.org/abs/1401.0135
Autor:
Karch, J., Sobolev, Yu., Beck, M., Eberhardt, K., Hampel, G., Heil, W., Kieser, R., Reich, T., Trautmann, N., Ziegner, M.
The performance of the solid deuterium ultra-cold neutron source at the pulsed reactor TRIGA Mainz with a maximum peak energy of 10 MJ is described. The solid deuterium converter with a volume of V=160 cm3 (8 mol), which is exposed to a thermal neutr
Externí odkaz:
http://arxiv.org/abs/1308.4610
Autor:
Karch, J., Drexler, C., Olbrich, P., Fehrenbacher, M., Hirmer, M., Glazov, M. M., Tarasenko, S. A., Ivchenko, E. L., Birkner, B., Eroms, J., Weiss, D., Yakimova, R., Lara-Avila, S., Kubatkin, S., Ostler, M., Seyller, T., Ganichev, S. D.
We observe photocurrents induced in single layer graphene samples by illumination of the graphene edges with circularly polarized terahertz radiation at normal incidence. The photocurrent flows along the sample edges and forms a vortex. Its winding d
Externí odkaz:
http://arxiv.org/abs/1107.3747
Autor:
Olbrich, P., Karch, J., Ivchenko, E. L., Kamann, J., März, B., Fehrenbacher, M., Weiss, D., Ganichev, S. D.
We study terahertz radiation induced ratchet currents in low dimensional semiconductor structures with a superimposed one-dimensional lateral periodic potential. The periodic potential is produced by etching a grating into the sample surface or depos
Externí odkaz:
http://arxiv.org/abs/1101.5051
Autor:
Karch, J., Tarasenko, S. A., Ivchenko, E. L., Kamann, J., Olbrich, P., Utz, M., Kvon, Z. D., Ganichev, S. D.
We demonstrate the injection of pure valley-orbit currents in multi-valley semiconductors and present the theory of this effect. We studied photo-induced transport in $n$-doped (111)-oriented silicon metal-oxide-semiconductor field effect transistors
Externí odkaz:
http://arxiv.org/abs/1010.4383
Autor:
Karch, J., Olbrich, P., Schmalzbauer, M., Zoth, C., Brinsteiner, C., Fehrenbacher, M., Wurstbauer, U., Glazov, M. M., Tarasenko, S. A., Ivchenko, E. L., Weiss, D., Eroms, J., Yakimova, R., Lara-Avila, S., Kubatkin, S., Ganichev, S. D.
We report the observation of the circular ac Hall effect where the current is solely driven by the crossed ac electric and magnetic fields of circularly polarized radiation. Illuminating an unbiased monolayer sheet of graphene with circularly polariz
Externí odkaz:
http://arxiv.org/abs/1008.2116
Autor:
Karch, J., Olbrich, P., Schmalzbauer, M., Brinsteiner, C., Wurstbauer, U., Glazov, M. M., Tarasenko, S. A., Ivchenko, E. L., Weiss, D., Eroms, J., Ganichev, S. D.
We report on the observation of photon helicity driven currents in graphene. The directed net electric current is generated in single layer graphene by circularly polarized terahertz laser radiation at normal as well as at oblique incidence and chang
Externí odkaz:
http://arxiv.org/abs/1002.1047
Autor:
Karch, J., Tarasenko, S. A., Olbrich, P., Schönberger, T., Reitmaier, C., Plohmann, D., Kvon, Z. D., Ganichev, S. D.
We report on the circular and linear photogalvanic effects caused by free-carrier absorption of terahertz radiation in electron channels on (001)-oriented and miscut silicon surfaces. The photocurrent behavior upon variation of the radiation polariza
Externí odkaz:
http://arxiv.org/abs/0912.0974