We investigate electronic transport through two types of conjugated molecules. Mechanically controlled break junctions are used to couple thiol end groups single molecules gold electrodes. Current-voltage characteristics ( IVs) the metal-molecule-metal system observed. These IVs reproduce spatial symmetry with respect direction current flow. hereby unambiguously detect an intrinsic property molecule and able distinguish influence both contact metal electrodes on properties compound system.

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 an aluminum bar with two or more ferromagnetic wires forming point contacts to at varying distances from each other. In normal state aluminum, we observe a signal which allows us control relative orientation magnetizations contacts. superconducting state, low temperatures excitation voltages well below gap, spin-dependent...

The electronic resistance of an electrode-molecule-electrode device strongly depends on the relative position anchor group in molecular structure. rod, immobilized through two sulfur groups meta a pair electrodes (see picture), displays considerably increased compared to rod with para position.

We report on the experimental observation of spin-dependent thermoelectric currents in superconductor-ferromagnet tunnel junctions high magnetic fields. The signals are due to a lifting particle-hole symmetry, and found be excellent agreement with recent theoretical predictions. maximum Seebeck coefficient inferred from data is about −100 μV/K, much larger than commonly metallic structures. Our results directly prove coupling spin heat transport high-field superconductors.Received 18...

A further component for molecular electronics: single molecule insulator is realized by immobilizing a platinum(II) complex between two gold electrodes (see picture). The current/voltage characteristics of the setup shows typical behavior an with tunnel barrier height 2.5 eV.

We report on nonlocal transport in multiterminal superconductor-ferromagnet structures, which were fabricated by means of e-beam lithography and shadow evaporation techniques. In the presence a significant Zeeman splitting quasiparticle states, we find signatures spin over distances several μm, exceeding other length scales such as coherence length, normal-state spin-diffusion charge-imbalance length. The relaxation signal shows nearly linear increase with magnetic field, hinting at...

An experiment demonstrating a link between classical single-flux quantum digital logic and superconducting circuit is reported. We implement coupling moving Josephson vortex (fluxon) flux qubit by reading out of state the through frequency shift fluxon oscillations in an annular junction. The energy spectrum measured using this technique. implemented hybrid scheme opens opportunity to readout states qubits with circuits.

Thermoelectric effects can be surprisingly large in superconductor-ferromagnet tunnel junctions when the superconductor is subject to a spin-splitting field. The spin splitting provided by an applied magnetic field, but also created exchange coupling ferromagnetic insulator. Here, it shown that thermoelectric enhanced boosting with intrinsic field These findings could lead more precise local electron thermometry or efficient microrefrigerators.

In conventional superconductors, electrons of opposite spins are bound into Cooper pairs. However, when the superconductor is in contact with a non-uniformly ordered ferromagnet, an exotic type superconductivity can appear at interface, three possible spin-triplet states. Triplet pairs equal spin play vital role low-dissipation spintronics. Despite observation supercurrents through ferromagnets, spectroscopic evidence for existence equal-spin triplet still missing. Here we show theoretical...

Gate-tunable Josephson junctions embedded in a microwave environment provide promising platform to situ engineer and optimize novel superconducting quantum circuits. The key quantity for the circuit design is phase-dependent complex admittance of junction, which can be probed by sensing radio frequency SQUID with tank circuit. Here, we investigate graphene-based junction as prototype gate-tunable element enclosed loop that inductively coupled resonator operating at 3 GHz. With concise model...

Since the discovery of Andreev reflection process at normal-metal/superconductor junctions and corresponding bound states in superconductor/normal-metal/superconductor junctions, various multiterminal Josephson have been studied to explore many exotic phases quantum matter, where formation normal region account for dissipationless supercurrent play a central role determining properties. Recently, an intriguing aspect has proposed study topological properties, wherein acquire characteristics...

We report a cantilever bending investigation into the variation of surface stress, f, with charge density, q, for (111)-textured thin films gold in aqueous NaF and HClO4. The graphs f(q) are highly linear, stress-charge coefficients, df/dq, −1.95 V 7 mM −2.0 10 HClO4 near potential zero charge. These values exceed some previously published experimental data by factor 2, but they agree recent ab initio calculations response vacuum.

We explore charge imbalance in mesoscopic normal-metal/superconductor multiterminal structures at very low temperatures. The investigated samples, fabricated by e-beam lithography and shadow evaporation, consist of a superconducting aluminum bar with several copper wires forming tunnel contacts different distances from each other. have measured detail the local nonlocal conductance these as function applied bias voltage $V$, magnetic field $B$, temperature $T$, contact distance $d$. From...

We report on nonlocal spin transport in mesoscopic superconducting aluminum wires contact with the ferromagnetic insulator europium sulfide. find injection and long-range regime of exchange splitting induced by Our results demonstrate that superconductors can be manipulated insulators, opens a new path to control currents superconductors.

The interplay of superconductivity and magnetism in nanoscale structures has attracted considerable attention recent years due to the exciting new physics created by competition these antagonistic ordering phenomena, prospect exploiting this for superconducting spintronics devices. While much is focused on spin-polarized supercurrents triplet proximity effect, discovery long range quasiparticle spin transport high-field superconductors rekindled interest spin-dependent nonequilibrium...

We report an experimental study of a Cooper pair splitter based on ballistic graphene multiterminal junctions. In two transverse junction geometry, namely the superconductor-graphene-superconductor and normal metal-graphene-normal metal, we observe clear signatures splitting in local as well nonlocal electronic transport measurements. Our data can be very described by our beam model. These results open up possibilities to design new entangled state detection experiments using splitters.

We report on nonlocal transport in superconductor hybrid structures, with ferromagnetic as well normal-metal tunnel junctions attached to the superconductor. In presence of a strong Zeeman splitting density states, both charge and spin imbalance is injected into While previous experiments demonstrated injection from electrodes, we show that also created for injector contacts. Using combination detectors allows us directly discriminate between injection, demonstrate complete separation...

We describe fabrication and testing of composite flux qubits combining Nb- Al-based superconducting circuit technology. This hybrid approach to making allows for employing pi-phase shifters fabricated using well-established Nb-based technology superconductor-ferromagnet-superconductor Josephson junctions. The important feature here is obtain high interface transparency between Nb Al layers without degrading sub-micron shadow mask. achieve this by in-situ Ar etching e-beam gun....

We report on specific-heat, magnetization, and ac-susceptibility measurements of ${\ensuremath{\beta}}^{\ensuremath{''}}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}{\mathrm{SF}}_{5}{\mathrm{CH}}_{2}{\mathrm{CF}}_{2}{\mathrm{SO}}_{3}$, an organic superconductor with ${T}_{c}=4.5$ K, where BEDT-TTF stands for bis(ethylenedithio)-tetrathiafulvalene. The jump the specific heat $C$ at ${T}_{c}$ exact form specific-heat difference between in superconducting $(B=0$ T) normal...

We report on high-resolution differential conductance experiments nanoscale superconductor-ferromagnet tunnel junctions with ultrathin oxide barriers. observe subgap features that are symmetric respect to bias and shift according the Zeeman energy an applied magnetic field. These can be explained by resonant transport via Andreev bound states induced spin-active scattering at interface. From of states, both magnitude sign spin-dependent interfacial phase shifts between spin-up spin-down...

Background: Thermoelectric effects result from the coupling of charge and heat transport can be used for thermometry, cooling harvesting thermal energy. The microscopic origin thermoelectric is a broken electron–hole symmetry, which usually quite small in metal structures. In addition, decrease towards low temperatures, makes them vanishingly nanostructures sub-Kelvin regime. Results: We report on combined experimental theoretical investigation superconductor/ferromagnet hybrid investigate...

We have measured local and nonlocal conductance of mesoscopic normal-metal/superconductor hybrid structures fabricated by e-beam lithography shadow evaporation. The sample geometry consists a superconducting aluminum bar with two normal-metal wires forming tunnel contacts to the at distances order coherence length. observe subgap anomalies in both that quickly decay magnetic field temperature. For positive negative signs are found as function bias conditions, indicating competition crossed...

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 a Cu/Fe bilayer forming bridge between two superconducting Al electrodes. In state electrodes, we observed double-peak peculiarity S-(N/F)-S structures bias voltage corresponding to minigap. claim that this effect (the splitting minigap) is due an electron spin polarization normal metal which induced by ferromagnet....