26 research outputs found
Two-dimensional superconductivity at the (111)LaAlO/SrTiO interface
We report on the discovery and transport study of the superconducting ground
state present at the (111)LaAlO/SrTiO interface. The superconducting
transition is consistent with a Berezinskii-Kosterlitz-Thouless transition and
its 2D nature is further corroborated by the anisotropy of the critical
magnetic field, as calculated by Tinkham. The estimated superconducting layer
thickness and coherence length are 10 nm and 60 nm, respectively. The results
of this work provide a new platform to clarify the microscopic details of
superconductivity at LaAlO/SrTiO interfaces, in particular in what
concerns the link with orbital symmetry.Comment: 4 pages, 4 figure
Superconducting molybdenum-rhenium electrodes for single-molecule transport studies
We demonstrate that electronic transport through single molecules or
molecular ensembles, commonly based on gold (Au) electrodes, can be extended to
superconducting electrodes by combining gold with molybdenum-rhenium (MoRe).
This combination induces proximity-effect superconductivity in the gold to
temperatures of at least 4.6 Kelvin and magnetic fields of 6 Tesla, improving
on previously reported aluminum based superconducting nanojunctions. As a proof
of concept, we show three-terminal superconductive transport measurements
through an individual Fe single-molecule magnet.Comment: 4 pages, 3 figure
Ground-State Spin Blockade in a Single-Molecule Junction
It is known that the quantum mechanical ground state of a nanoscale junction has a significant impact on its electrical transport properties. This becomes particularly important in transistors consisting of a single molecule. Because of strong electron-electron interactions and the possibility of accessing ground states with high spins, these systems are eligible hosts of a current-blockade phenomenon called a ground-state spin blockade. This effect arises from the inability of a charge carrier to account for the spin difference required to enter the junction, as that process would violate the spin selection rules. Here, we present a direct experimental demonstration of a ground-state spin blockade in a high-spin single-molecule transistor. The measured transport characteristics of this device exhibit a complete suppression of resonant transport due to a ground-state spin difference of 3/2 between subsequent charge states. Strikingly, the blockade can be reversibly lifted by driving the system through a magnetic ground-state transition in one charge state, using the tunability offered by both magnetic and electric fields
Correlated Spin Phenomena in Molecular Quantum Transport Devices
In this thesis we study charge transport through individual molecules and mainly focus on the properties of molecular spin. We fabricate nanoscale structures for transport measurements and employ the electromigration break-junction technique to realize three-terminal—transistor-like—single-molecule devices. We investigate the spin-related phenomena that occur in these devices by performing transport experiments.QN/van der Zant La