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Granular aluminium superinductors

Produktform: Buch / Einband - flex.(Paperback)


We investigate superconducting granular aluminum (grAl) as a promising material for quantum circuits. We show that grAl strips can reach kinetic inductances up to nH/sq, while maintaining small microwave frequency losses. We identify excess quasiparticles as a limiting loss mechanism, and find quasiparticle relaxation times on the order of seconds. By fabricating a fluxonium quantum bit with a grAl superinductor, we demonstrate that grAl is a viable material for superconducting quantum circuits.

Verlag: KIT Scientific Publishing, 170 Seiten

Erscheinungsdatum: 24.10.2019

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Quantum simulation experiments with superconducting circuits

Produktform: Buch / Einband - flex.(Paperback)


While the universal quantum computer seems not in reach for the near future, this work focusses on analog quantum simulation of intriguing quantum models of light-matter interactions, with the goal of achieving a computational speed-up as compared to classical hardware. Existing building blocks of quantum hardware are used from superconducting circuits, that have proven to be a very suitable experimental platform for the implementation of model Hamiltonians at a high degree of controllability.

Verlag: KIT Scientific Publishing, 168 Seiten

Erscheinungsdatum: 14.06.2018

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Electroluminescence from Plasmonic Excitations in a Scanning Tunnelling Microscope

Produktform: Buch / Einband - flex.(Paperback)


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.

Verlag: KIT Scientific Publishing, 162 Seiten

Erscheinungsdatum: 03.07.2019

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Sub-Kelvin scanning tunneling microscopy on magnetic molecules

Produktform: Buch / Einband - flex.(Paperback)


Magnetic molecules have attracted lots of interest. In this work, an ultra-stable and low noise scanning tunneling microscopy operating at 400 mK using He-3 (930 mK using He-4) has been developed. The magnetic behavior of different magnetic molecules on substrates, especially the exchange interaction between the magnetic ions, the magnetic anisotropy on the surface, the magnetic excitations as well as the Kondo effect, were studied by using STM.

Verlag: KIT Scientific Publishing, 118 Seiten

Erscheinungsdatum: 05.07.2019

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Elastic and Inelastic Scanning Tunneling Spectroscopy on Iron-Based Superconductors

Produktform: Buch / Einband - flex.(Paperback)


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-fluctuation mediated) superconductivity.

Verlag: KIT Scientific Publishing, 244 Seiten

Erscheinungsdatum: 02.05.2019

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Resolving locations of defects in superconducting transmon qubits

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Despite tremendous progress of quantum computation with superconducting qubits, up-scaling for practical applications is hindered by decoherence and fluctuations induced by material defects. In this work, a qubit interface has been developed to study the microscopic nature of individual defects in a probe material. Further, a portable method has been developed to find locations of individual defects in ready-made qubit samples, which offers to test and improve micro-fabrication of qubits.

Verlag: KIT Scientific Publishing, 128 Seiten

Erscheinungsdatum: 09.12.2019

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Local Investigation of Single Magnetic Molecules with Scanning Tunneling Microscopy

Produktform: Buch / Einband - flex.(Paperback)


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.

Verlag: KIT Scientific Publishing, 148 Seiten

Erscheinungsdatum: 18.01.2019

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Einfluss der Leitungselektronen auf die Dynamik atomarer Tunnelsysteme in ungeordneten Festkörpern: Relaxationsprozesse in metallischen Gläsern und ungeordneten dünnen Aluminiumoxid-Schichten

Produktform: Buch / Einband - flex.(Paperback)


Die Schallgeschwindigkeit in metallischen Gläsern und die Permittivität von dielektrischen Aluminiumoxid-Schichten zeigen ein für amorphe Festkörper typisches Tieftemperaturverhalten. Akustische Messungen von wenigen kHz bis GHz zeigen den Einfluss der Leitungselektronen in einem massiven metallischen Glas. Messungen der Permittivität bei einigen kHz zeigen überaschenderweise ebenfalls einen Einfluss der Elektronen auf die Eigenschaften einer isolierenden Schicht. The speed of sound in metallic glasses and the permittivity of dielectric alumina layers show the typical low-temperature behavior of amorphous solids. Acoustic measurements from a few kHz to GHz show the influence of the conduction electrons in a massive bulk metallic glass. Measurements of the permittivity at a few kHz surprisingly show an influence of the electrons on the properties of an insulating layer.

Verlag: KIT Scientific Publishing, 116 Seiten

Erscheinungsdatum: 26.03.2019

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