Zobrazeno 1 - 10
of 258
pro vyhledávání: '"Schopohl, N."'
Autor:
Schopohl, N., Cetin, N. S.
The Dirac Hamiltonian $H^{\left(D\right)}$ for relativistic charged fermions minimally coupled to (possibly time-dependent) electromagnetic fields is transformed with a purpose-built flow equation method, so that the result of that transformation is
Externí odkaz:
http://arxiv.org/abs/2207.12825
Autor:
Markowsky, A., Schopohl, N.
Publikováno v:
Phys. Rev. A 89, 013622 (2014)
We show that massive low energy particles traversing a branching zone or a crossing of quantum waveguides may experience a non standard trapping force that cannot be derived from a potential. For interacting cold Bose atoms we report on the formation
Externí odkaz:
http://arxiv.org/abs/1309.3205
Publikováno v:
Phys. Rev. A 82, 053620 (2010)
We report new results for the Thomas-Fermi groundstate and the quadrupolar modes of density oscillations of a spin- polarized dipolar interacting Bose-Einstein condensate for the case when the external magnetic field is not orientated parallel to a p
Externí odkaz:
http://arxiv.org/abs/1006.4734
Publikováno v:
Phys. Rev. Lett. 104, 237001 (2010)
We demonstrate that in a d-wave superconductor the bulk nonlinear Meissner effect is dominated by a surface effect due to Andreev bound states at low temperatures. The contribution of this surface effect to the nonlinear response coefficient follows
Externí odkaz:
http://arxiv.org/abs/1003.2527
Josephson junctions with an intrinsic phase shift of pi, so-called pi Josephson junctions, can be realized by a weak link of a d-wave superconductor with an appropriate boundary geometry. A model for the pairing potential of an according weak link is
Externí odkaz:
http://arxiv.org/abs/0902.3991
Autor:
Gumann, A., Schopohl, N.
Publikováno v:
Phys. Rev. B 79, 144505 (2009)
We show that a constriction-type Josephson junction realized by an epitactic thin film of a d-wave superconductor with an appropriate boundary geometry exhibits intrinsic phase differences between 0 and pi depending on geometric parameters and temper
Externí odkaz:
http://arxiv.org/abs/0808.2140
Publikováno v:
Phys. Rev. B 78, 104524 (2008)
We study the influence of Born impurity scattering on the zero-energy Andreev bound states near the surface of a d-wave superconductor with and without an externally applied magnetic field. Without an external magnetic field we show that the effect o
Externí odkaz:
http://arxiv.org/abs/0807.4453
Autor:
Wagenknecht, M., Koelle, D., Kleiner, R., Graser, S., Schopohl, N., Chesca, B., Tsukada, A., Goennenwein, S. T. B., Gross, R.
Publikováno v:
Phys. Rev. Lett. 100, 227001 (2008)
We investigate in-plane quasiparticle tunneling across thin film grain boundary junctions (GBJs) of the electron-doped cuprate La$_{2-x}$Ce$_{x}$CuO$_4$ in magnetic fields up to $B=16 $T, perpendicular to the CuO$_2$ layers. The differential conducta
Externí odkaz:
http://arxiv.org/abs/0709.2853
Publikováno v:
Appl. Phys. Lett. 91, 192502 (2007)
A novel way to realize a pi Josephson junction is proposed, based on a weak link in an unconventional d-wave superconductor with appropriately chosen boundary geometry. The critical current of such a junction is calculated from a fully selfconsistent
Externí odkaz:
http://arxiv.org/abs/0708.3898
Publikováno v:
Phys. Rev. Lett. 100, 037002 (2008)
We study the influence of surface Andreev bound states in d-wave superconductors on the Bean-Livingston surface barrier for entry of a vortex line into a strongly type-II superconductor. Starting from Eilenberger theory we derive a generalization of
Externí odkaz:
http://arxiv.org/abs/0705.1819