Zobrazeno 1 - 10
of 624
pro vyhledávání: '"Gaber, T"'
Autor:
Jessen, F., Knufinke, M., Bell, S. C., Vergien, P., Hattermann, H., Weiss, P., Rudolph, M., Reinschmidt, M., Meyer, K., Gaber, T., Cano, D., Guenther, A., Bernon, S., Koelle, D., Kleiner, R., Fortagh, J.
We describe the preparation of ultra cold atomic clouds in a dilution refrigerator. The closed cycle 3He/4He cryostat was custom made to provide optical access for laser cooling, optical manipulation and detection of atoms. We show that the cryostat
Externí odkaz:
http://arxiv.org/abs/1309.2548
Autor:
Bothner, D., Clauss, C., Koroknay, E., Kemmler, M., Gaber, T., Jetter, M., Scheffler, M., Michler, P., Dressel, M., Koelle, D., Kleiner, R.
We experimentally investigate the vortex induced energy losses in niobium coplanar waveguide resonators with and without quasihexagonal arrays of nanoholes (antidots), where large-area antidot patterns have been fabricated using self-assembling micro
Externí odkaz:
http://arxiv.org/abs/1110.6332
Autor:
Kienzle, U., Meckbach, J. M., Buckenmaier, K., Gaber, T., Sickinger, H., Kaiser, Ch., Ilin, K., Siegel, M., Koelle, D., Kleiner, R., Goldobin, E.
Publikováno v:
Phys. Rev. B 85, 014521 (2012)
In long Josephson junctions with multiple discontinuities of the Josephson phase, fractional vortex molecules are spontaneously formed. At each discontinuity point a fractional Josephson vortex carrying a magnetic flux $|\Phi|<\Phi_0$, $\Phi_0\approx
Externí odkaz:
http://arxiv.org/abs/1110.4229
Autor:
Kienzle, U., Gaber, T., Buckenmaier, K., Ilin, K., Siegel, M., Koelle, D., Kleiner, R., Goldobin, E.
Publikováno v:
Phys. Rev. B 80, 014504 (2009)
We consider a fractional Josephson vortex in a long 0-kappa Josephson junction. A uniformly applied bias current exerts a Lorentz force on the vortex. If the bias current exceeds the critical current, an integer fluxon is torn off the kappa-vortex an
Externí odkaz:
http://arxiv.org/abs/0903.3382
Autor:
Pfeiffer, J., Gaber, T., Koelle, D., Kleiner, R., Goldobin, E., Weides, M., Kohlstedt, H., Lisenfeld, J., Feofanov, A. K., Ustinov, A. V.
We present experimental studies of high quality underdamped 0, pi, and 0-pi ferromagnetic Josephson tunnel junctions of intermediate length L (lambda_J < L < 5 lambda_J, where lambda_J is the Josephson penetration depth). The junctions are fabricated
Externí odkaz:
http://arxiv.org/abs/0903.1046
Autor:
Nagel, J., Speer, D., Gaber, T., Sterck, A., Eichhorn, R., Reimann, P., Ilin, K., Siegel, M., Koelle, D., Kleiner, R.
We experimentally demonstrate the occurrence of negative absolute resistance (NAR) up to about $-1\Omega$ in response to an externally applied dc current for a shunted Nb-Al/AlO$_x$-Nb Josephson junction, exposed to a microwave current at frequencies
Externí odkaz:
http://arxiv.org/abs/0801.4370
Publikováno v:
Phys. Rev. Lett. 98, 117006, (2007)
Fractional Josephson vortices carry a magnetic flux Phi, which is a fraction of the magnetic flux quantum Phi_0 ~ 2.07x10^{-15} Wb. Their properties are very different from the properties of the usual integer fluxons. In particular, fractional vortic
Externí odkaz:
http://arxiv.org/abs/cond-mat/0610043
Publikováno v:
Phys. Rev. B 72, 054522 (2005)
We investigate the creation of an arbitrary $\kappa$-discontinuity of the Josephson phase in a long Nb-AlO_x-Nb Josephson junction (LJJ) using a pair of tiny current injectors, and study the formation of fractional vortices formed at this discontinui
Externí odkaz:
http://arxiv.org/abs/cond-mat/0408214
Publikováno v:
Phys. Rev. Lett. 92, 057005 (2004)
We propose, implement and test experimentally long Josephson 0-pi junctions fabricated using conventional Nb-AlOx-Nb technology. We show that using a pair of current injectors, one can create an arbitrary discontinuity of the Josephson phase and in p
Externí odkaz:
http://arxiv.org/abs/cond-mat/0311610
Publikováno v:
PRA 68 013815 2003
We report on the generation of polarization squeezing of intense, short light pulses using an asymmetric fiber Sagnac interferometer. The Kerr nonlinearity of the fiber is exploited to produce independent amplitude squeezed pulses. The polarization s
Externí odkaz:
http://arxiv.org/abs/quant-ph/0302100