Investigation Of Magnetic Adatoms With Scanning Tunneling Techniques
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| 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 | : Chen, Jinjie |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 146 |
| Release | : 2019-01-18 |
| Genre | : Molecules |
| ISBN | : 3731508192 |
We worked on different magnetic molecules containing 3d and 4f magnetic centers. Their growth on metallic surfaces, topographies, spin states, magnetic properties and electron transport were locally investigated by using scanning tunneling microscopy (STM) at temperatures down to 30mK. The main achievement of this dissertation reveals the abrupt switching of crystal fields during formation of molecular contacts.
| Author | : Zhang, Lei |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 116 |
| Release | : 2019-07-05 |
| Genre | : Science |
| ISBN | : 386644950X |
| 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 | : 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 | : Gozlinski, Thomas |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 208 |
| Release | : 2023-03-24 |
| Genre | : Science |
| ISBN | : 3731512793 |
Complementary to scattering techniques, scanning tunnelling microscopy provides atomic-scale real space information about a material's electronic state of matter. State-of-the-art designs of a scanning tunnelling microscope (STM) allow measurements at millikelvin temperatures with unprecedented energy resolution. Therefore, this instrument excels in probing the superconducting state at low temperatures and especially its local quasiparticle excitations as well as bosonic degrees of freedom.
| 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 | : 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.
| Author | : Grünhaupt, Lukas |
| Publisher | : KIT Scientific Publishing |
| Total Pages | : 168 |
| Release | : 2019-10-24 |
| Genre | : Science |
| ISBN | : 3731509563 |
