66 citations · 185 across the 6 of their papers we have counts for
6 papers
Parameter-Agnostic Optimization under Relaxed Smoothness
Florian Hübler, Junchi Yang, Xiang Li +1
Tuning hyperparameters, such as the stepsize, presents a major challenge of training machine learning models. To address this challenge, numerous adaptive optimization algorithms h…
Charge and spin transport in mesoscopic superconductors
M. J. Wolf, F. Hübler, S. Kolenda +1
Nonequilibrium charge transport in superconductors has been investigated intensely in the 1970s and 80s, mostly in the vicinity of the critical temperature. Much less attention has…
Double proximity effect in hybrid planar Superconductor-(Normal metal/Ferromagnet)-Superconductor structures
Tatiana E. Golikova, Florian Huebler, Detlef Beckmann +5
We have investigated the differential resistance of hybrid planar Al-(Cu/Fe)-Al submicron bridges at low temperatures and in weak magnetic fields. The structure consists of Cu/Fe-b…
Observation of Andreev bound states at spin-active interfaces
F. Hübler, M. J. Wolf, T. Scherer +3
We report on high-resolution differential conductance experiments on nanoscale superconductor/ferromagnet tunnel junctions with ultra-thin oxide tunnel barriers. We observe subgap…
Charge imbalance in superconductors in the low-temperature limit
F. Hübler, J. Camirand Lemyre, D. Beckmann +1
We explore charge imbalance in mesoscopic normal-metal/superconductor multiterminal structures at very low temperatures. The investigated samples, fabricated by e-beam lithography…
Non-local transport in normal-metal/superconductor hybrid structures: the role of interference and interaction
J. Brauer, F. Hübler, M. Smetanin +2
We have measured local and non-local conductance of mesoscopic normal-metal/superconductor hybrid structures fabricated by e-beam lithography and shadow evaporation. The sample geo…