Publications (24)
Nonlocal thermoelectric effects in high-field superconductor-ferromagnet hybrid structures
J. Heidrich, D. Beckmann
We report on the experimental observation of nonlocal spin-dependent thermoelectric effects in superconductor-ferromagnet multiterminal structures. Our samples consist of a thin su…
Driving current through single organic molecules
J. Reichert, R. Ochs, D. Beckmann +3
We investigate electronic transport through two types of conjugated molecules. Mechanically controlled break-junctions are used to couple thiol endgroups of single molecules to two…
Fabrication and measurements of hybrid Nb/Al Josephson junctions and flux qubits with pi-shifters
A. V. Shcherbakova, K. G. Fedorov, K. V. Shulga +8
We describe fabrication and testing of composite flux qubits combining Nb- and Al-based superconducting circuit technology. This hybrid approach to making qubits allows for employi…
Dimensionality effects on non-equilibrium electronic transport in Cu nanobridges
D. Beckmann, H. B. Weber, H. v. Löhneysen
We report on non-equilibrium electronic transport through normal-metal (Cu) nanobridges coupled to large reservoirs at low temperatures. We observe a logarithmic temperature depend…
Experimental and theoretical study of field-dependent spin splitting at ferromagnetic-insulator-superconductor interfaces
P. Machon, M. J. Wolf, D. Beckmann +1
We present a combined experimental and theoretical work that investigates the magnetic proximity effect at a ferromagnetic-insulator - superconductor (FI-S) interface. The simulati…
Long-range spin-polarized quasiparticle transport in mesoscopic Al superconductors with a Zeeman splitting
F. Hübler, M. J. Wolf, D. Beckmann +1
We report on nonlocal transport in multiterminal superconductor-ferromagnet structures, which were fabricated by means of e-beam lithography and shadow evaporation techniques. In t…
Spin injection from a normal metal into a mesoscopic superconductor
M. J. Wolf, F. Hübler, S. Kolenda +2
We report on nonlocal transport in superconductor hybrid structures, with ferromagnetic as well as normal-metal tunnel junctions attached to the superconductor. In the presence of…
Experimental Evidence for Crossed Andreev Reflection
D. Beckmann, H. v. Löhneysen
We report on electronic transport properties of mesoscopic superconductor-ferromagnet spin-valve structures. Two ferromagnetic iron leads form planar tunnel contacts to a supercond…
Nonlinear thermoelectric effects in high-field superconductor-ferromagnet tunnel junctions
S. Kolenda, P. Machon, D. Beckmann +1
Thermoelectric effects result from the coupling of charge and heat transport, and can be used for thermometry, cooling and harvesting of thermal energy. The microscopic origin of t…
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…
Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide
S. Kolenda, C. Sürgers, G. Fischer +1
We report on large thermoelectric effects in superconductor-ferromagnet tunnel junctions in proximity contact with the ferromagnetic insulator europium sulfide. The combination of…
Energy distribution controlled ballistic Josephson junction
P. Pandey, D. Beckmann, R. Danneau
We report an experimental study on the tuning of supercurrent in a ballistic graphene-based Josephson junction by applying a control voltage to a transverse normal channel. In this…
Andreev reflection in ballistic normal metal/graphene/superconductor junctions
P. Pandey, R. Kraft, R. Krupke +2
We report the study of ballistic transport in normal metal/graphene/superconductor junctions in edge-contact geometry. While in the normal state, we have observed Fabry-Pérot reso…
Observation of thermoelectric currents in high-field superconductor-ferromagnet tunnel junctions
S. Kolenda, M. J. Wolf, D. Beckmann
We report on the experimental observation of thermoelectric currents in superconductor-ferromagnet tunnel junctions in high magnetic fields. The thermoelectric signals are due to a…
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…
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…
Nonlocal supercurrent in mesoscopic multiterminal SNS Josephson junction in the low-temperature limit
T. E. Golikova, M. J. Wolf, D. Beckmann +4
Nonlocal supercurrent was observed in mesoscopic planar SNS Josephson junction with additional normal metal electrodes when nonequilibrium quasiparticles were injected from the nor…
Nonlocal transport and heating in superconductors under dual-bias conditions
S. Kolenda, M. J. Wolf, D. S. Golubev +2
We report on an experimental and theoretical study of nonlocal transport in superconductor hybrid structures, where two normal-metal leads are attached to a central superconducting…
Spin-polarized quasiparticle transport in exchange-split superconducting aluminum on europium sulfide
M. J. Wolf, C. Sürgers, G. Fischer +1
We report on nonlocal spin transport in mesoscopic superconducting aluminum wires in contact with the ferromagnetic insulator europium sulfide. We find spin injection and long-rang…
Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
D. Beckmann, H. B. Weber, H. v. Löhneysen
We have measured the non-local resistance of aluminum-iron spin-valve structures fabricated by e-beam lithography and shadow evaporation. The sample geometry consists of an aluminu…
Spin-dependent coupling of supercurrent and nonequilibrium quasiparticles in high-field superconductors
P. Maier, D. Beckmann
We report on an experimental investigation of the combined effect of nonequilibrium quasiparticle injection and supercurrent in superconducting aluminum wires. At low temperature,…
A Ballistic Graphene Cooper Pair Splitter
P. Pandey, R. Danneau, D. Beckmann
We report an experimental study of Cooper pair splitting in an encapsulated graphene based multiterminal junction in the ballistic transport regime. Our device consists of two tran…
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…
Contacting single bundles of carbon nanotubes with alternating electric fields
R. Krupke, F. Hennrich, H. B. Weber +5
Single bundles of carbon nanotubes have been selectively deposited from suspensions onto sub-micron electrodes with alternating electric fields. We explore the resulting contacts u…