Author : Grabovskij, Grigorij Jurevic
Publisher : KIT Scientific Publishing
Page : 124 pages
File Size : 26,10 MB
Release : 2014-08-07
Category : 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
Page : 160 pages
File Size : 22,92 MB
Release : 2019-07-03
Category : 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 : Chen, Jinjie
Publisher : KIT Scientific Publishing
Page : 146 pages
File Size : 49,34 MB
Release : 2019-01-18
Category : 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 : Wildermuth, Matthias Micha
Publisher : KIT Scientific Publishing
Page : 160 pages
File Size : 18,49 MB
Release : 2023-09-11
Category :
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
Page : 114 pages
File Size : 36,23 MB
Release : 2016-01-20
Category : 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 : Bilmes, Alexander
Publisher : KIT Scientific Publishing
Page : 128 pages
File Size : 36,4 MB
Release : 2019-12-09
Category : Science
ISBN : 3731509679
Author : Rai, Vibhuti Narayan
Publisher : KIT Scientific Publishing
Page : 150 pages
File Size : 26,81 MB
Release : 2022-10-04
Category : 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 : Peter, Moritz
Publisher : KIT Scientific Publishing
Page : 164 pages
File Size : 46,96 MB
Release : 2015-09-18
Category : Physics
ISBN : 3731504103
The present work introduces a new concept for magnetic resonance measurements in the GHz regime inside a scanning tunneling microscope. It is based on heterodyne detection in a spin-polarized tunneling barrier. The experimental requirements, including a new method to suppress transmission effects, are explained. Measurements on three model systems which were studied to validate the new technique are presented and compared to simulations.
Author : Zhang, Lei
Publisher : KIT Scientific Publishing
Page : 116 pages
File Size : 45,91 MB
Release : 2019-07-05
Category : Science
ISBN : 386644950X
Author : Jandke, Jasmin Maria
Publisher : KIT Scientific Publishing
Page : 242 pages
File Size : 24,70 MB
Release : 2019-05-02
Category : 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.
