Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Lofwander, T."'
Publikováno v:
Phys. Rev. B 99, 184511 (2019)
Surfaces of $d$-wave superconductors may host a substantial density of zero-energy Andreev states. The zero-energy flat band appears due to a topological constraint, but comes with a cost in free energy. We have recently found that an adjustment of t
Externí odkaz:
http://arxiv.org/abs/1902.07530
Publikováno v:
Nature Communications 9, 2190 (2018)
We investigate equilibrium properties, including structure of the order parameter, superflow patterns, and thermodynamics of low-temperature surface phases of layered d_{x^2-y^2}-wave superconductors in magnetic field. At zero external magnetic field
Externí odkaz:
http://arxiv.org/abs/1711.07946
We present results for non-adiabatic single-parameter pumping in a ballistic graphene field-effect transistor. We investigate how scattering from an ac-driven top gate results in dc charge current from source to drain in an asymmetric setup caused ei
Externí odkaz:
http://arxiv.org/abs/1705.05350
Publikováno v:
Phys. Rev. B 93, 035435 (2016)
We report a theoretical study of time-dependent transport in a ballistic graphene field effect transistor. We develop a model based on Floquet theory describing Dirac electron transmission through a harmonically driven potential barrier. Photon-assis
Externí odkaz:
http://arxiv.org/abs/1506.03341
Publikováno v:
Phys. Rev. B 84, 155451 (2011)
We present atomistic calculations of quantum coherent electron transport through fulleropyrrolidine terminated molecules bridging a graphene nanogap. We predict that three difficult problems in molecular electronics with single molecules may be solve
Externí odkaz:
http://arxiv.org/abs/1108.4571
Publikováno v:
J. Low Temp. Phys. 147, 457, 2007
Using selection rules imposed by the Pauli principle, we classify pairing correlations according to their symmetry properties with respect to spin, momentum, and energy. We observe that inhomogeneity always leads to mixing of even- and odd-energy pai
Externí odkaz:
http://arxiv.org/abs/cond-mat/0610212
Autor:
Shelukhin, V., Tsukernik, A., Karpovski, M., Blum, Y., Efetov, K. B., Volkov, A. F., Champel, T., Eschrig, M., Lofwander, T., Schon, G., Palevski, A.
Publikováno v:
Phys. Rev. B 73,1 (2006)
We report complementary studies of the critical temperature and the critical current in ferromagnet (Ni) - superconductor (Nb) multilayers. The observed oscillatory behavior of both quantities upon variation of the thickness of the ferromagnetic laye
Externí odkaz:
http://arxiv.org/abs/cond-mat/0512593
Publikováno v:
Physica C 367 (1-4), 86 (2002)
We discuss how life-time broadening of quasiparticle states influences single- and two-particle current transport through zero-energy states at normal metal/d-wave superconductor junctions. We distinguish between intrinsic broadening (imaginary part
Externí odkaz:
http://arxiv.org/abs/cond-mat/0108162
Publikováno v:
Supercond. Sci. Technol. 14, R53 (2001)
The formation of bound states at surfaces of materials with an energy gap in the bulk electron spectrum is a well known physical phenomenon. At superconductor surfaces, quasiparticles with energies inside the superconducting gap $\Delta$ may be trapp
Externí odkaz:
http://arxiv.org/abs/cond-mat/0102276
Publikováno v:
Phys. Rev. B 62, R14653 (2000).
We study spontaneous time-reversal symmetry breaking at Josephson tunnel junctions of d-wave superconductors in the absence of subdominant components of the order parameter. For tunnel junctions, when the orientation is close to 0/45 (for which a gap
Externí odkaz:
http://arxiv.org/abs/cond-mat/0008235