Investigation Of Coherent Microscopic Defects Inside The Tunneling Barrier Of A Josephson Junction
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| Author | : Grabovskij, Grigorij Jurevic |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 124 |
| Release | : 2014-08-07 |
| Genre | : Physics |
| ISBN | : 3731502100 |
In disordered solids, two-level atomic-tunneling systems are present in large quantity. Only recently, superconducting qubits opened a door for a detection and individual coherent manipulation of such microscopic quantum systems. We succeeded to tune the resonance frequencies of these systems by applying external strain on the qubit chip. Moreover, we observed and analyzed the interaction between two coupled tunneling systems.
| Author | : Edelmann, Kevin |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 160 |
| Release | : 2019-07-03 |
| Genre | : Science |
| ISBN | : 3731509237 |
This work presents the design and commissioning of a new low-temperature Scanning Tunnelling Microscope equipped with an innovative light collection setup using an integrated, micro-fabricated mirror tip. Commissioning experiments demonstrate the capabilities of this new instrument and reproduce known effects regarding gap plasmons on noble-metal surfaces. Furthermore, different contrasts in the plasmon-mediated light emission from Cobalt nano-islands on a Copper (111) substrate are reported.
| Author | : Bilmes, Alexander |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 128 |
| Release | : 2019-12-09 |
| Genre | : Science |
| ISBN | : 3731509679 |
| Author | : Wildermuth, Matthias Micha |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 160 |
| Release | : 2023-09-11 |
| Genre | : |
| ISBN | : 373151303X |
In the last decades, superconducting devices have emerged as a promising platform for quantum technologies, including quantum sensing and quantum computing. Their key elements are Josephson junctions, which allow for coherent supercurrent tunneling between two weakly linked superconductors. If such a junction is extended in one direction to a long junction, the superconducting phase difference can vary in space and time and may allow for quantized phase windings that drive supercurrent vortices.
| Author | : Maerkl, Junji Tobias |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 114 |
| Release | : 2016-01-20 |
| Genre | : Physics |
| ISBN | : 3731504359 |
In this work, magnetic atoms on surfaces are studied with low-temperature scanning tunneling microscopy. Motivated by the idea to use single atoms as magnetic bits, the factors that allow or prevent long-term stability of their magnetic moments are investigated. Lifetimes of up to several minutes can be achieved for the magnetic moments of holmium atoms on a Pt(111) surface, resulting from the combined symmetries of the system. Corresponding theoretical calculations are presented and evaluated.
| Author | : Rai, Vibhuti Narayan |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 150 |
| Release | : 2022-10-04 |
| Genre | : Science |
| ISBN | : 3731512017 |
In this work, a clear pathway is presented to achieve well-defined electronically decoupled chromophores from metallic leads without requiring additional insulating layers. To study such self-decoupled molecules, STM equipped with an efficient light detection setup has been used. Results show that the chromophores mounted on tripodal molecular platforms adsorbed on a gold surface present well-defined and efficient electroluminescence down to the single-molecule level.
| Author | : Jandke, Jasmin Maria |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 242 |
| Release | : 2019-05-02 |
| Genre | : Physics |
| ISBN | : 3731507471 |
Within this work, the pairing mechanism of conventional (Pb) and unconventional superconductors (SrFe2(As1-xPx )2 , FeSe, FeSe/STO) was investigated experimentally by means of elastic and inelastic tunneling spectroscopy at temperatures down to 30 mK. The distinction between elastic and inelastic contributions to tunneling data was elaborated. The results help to identify conventional (phonon-mediated) and unconventional (e.g. spin-?uctuation mediated) superconductivity.
| Author | : Schackert, Michael Peter |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 148 |
| Release | : 2015-03-23 |
| Genre | : Physics |
| ISBN | : 3731502380 |
This work describes the experimental study of electron-boson interactions in superconductors by means of inelastic electron tunneling spectroscopy performed with a scanning tunneling microscope (STM) at temperatures below 1 K. This new approach allows the direct measurement of the Eliashberg function of conventional superconductors as demonstrated on lead (Pb) and niobium (Nb). Preparative experiments on unconventional iron-pnictides are presented in the end.
| Author | : Grünhaupt, Lukas |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 168 |
| Release | : 2019-10-24 |
| Genre | : Science |
| ISBN | : 3731509563 |
| Author | : Pfirrmann, Marco |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 136 |
| Release | : 2020-10-05 |
| Genre | : Science |
| ISBN | : 3731510030 |
In this book, hybrid systems based on yttrium-iron-garnet (YIG), three dimensional microwave cavity resonators, and superconducting transmon qubits, are investigated by continuous wave and pulsed microwave spectroscopy. Limitations to the magnetic linewidth in the quantum regime are identified and coherent exchange between a magnon and a superconducting qubit are demonstrated. Finally, a first step towards a strongly coupled hybrid system containing all three components is demonstrated.
