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Dr. rer. nat. Hans-Gregor Hübl

Photo von Dr. rer. nat. Hans-Gregor Hübl.
Phone
+49 89 289-14204
Room
E-Mail
hans.huebl@tum.de
Links
Homepage
Page in TUMonline
Group
Technical Physics
Job Title
PD at the Physics Department

Courses and Dates

Title and Module Assignment
ArtSWSLecturer(s)Dates
Advances in Solid State Physics
course documents
Assigned to modules:
PS 2 Deppe, F. Gross, R. Hübl, H.
Assisstants: Althammer, M.Geprägs, S.
Tue, 10:15–11:45, virtuell
and singular or moved dates
Topical Issues in Magneto- and Spintronics
eLearning course
Assigned to modules:
HS 2 Brandt, M. Hübl, H.
Assisstants: Althammer, M.Geprägs, S.Opel, M.Weiler, M.
Wed, 11:30–13:00, WSI S101
Spin Currents and Skyrmionics
eLearning course
Assigned to modules:
PS 2 Hübl, H. Opel, M.
Assisstants: Althammer, M.Geprägs, S.Weiler, M.
Thu, 14:00–15:30, WMI 142
Walther-Meißner-Seminar on Topical Problems of Low Temperature Physics
current information
Assigned to modules:
SE 2 Althammer, M. Deppe, F. Einzel, D. Gross, R. Hackl, R. … (insgesamt 8) Fri, 11:00–12:30, WMI 143

Offered Bachelor’s or Master’s Theses Topics

Elektronenspindynamik in einer stark koppelnden Umgebung

Modern quantum circuits allow to study strong light-matter interaction in a variety of systems. This so-called strong-coupling regime is key for many aspects of quantum information processing. This project focusses on strong coupling between a paramagnetic electron spin ensemble and a superconducting microwave resonator. Strong coupling is an established phenomenon in this system. However, many aspects regarding the dynamics of this coupled system as well as the non-linear response properties are not fully understood, yet, and we will address these aspects within this project. For this project, we will use superconducting microwave resonators based on NbTiN and spin paramagnetic spin ensembles of phosphorous donors and erbium centers in silicon.

 

We are looking for a highly motivated master student joining this project. Within your thesis, you will address questions regarding the dynamic response of a strongly coupled system based on a paramagnetic spin ensemble and a microwave resonator. In this context, you will fabricate and optimize microwave resonators and operate them at cryogenic temperatures. In addition, you will use complex microwave pulses, to control the coupled system and experimentally investigate its dynamical response. Within the project, you will learn how to fabricate superconducting microwave resonators in our in-house cleanroom and how to synthesize microwave pulses using arbitrary waveform generators

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Hans Hübl
Hochempfindliche Mikrowellenspektroskopie für die Elektronenspinresonanz

Planar superconducting microwave resonators are key for the ultra-sensitive detection of spin properties. We employ planar microwave resonators fabricated from various superconducting materials like Nb, NbN and NbTiN and test their performance with respect to field and temperature stability. With your help, we aim to improve our existing variable temperature setup operating between 1.5 and 300K. In detail, you shall assemble a new measurement inset including a cryogenic microwave amplifier, and asses the overall performance of the setup using electron spin resonance. Moreover, you shall further optimize microwave resonators to improve their quality factors.

 

Your bachelor thesis will bring you in touch with state-of-the-art microwave spectroscopy tools like vector network analyzers, as well as cryogenic measurement environments. In addition, you will fabricate and optimize microwave resonators and perform the microwave spectroscopy measurements. Moreover, the careful data analysis of the magnetic field dependent datasets will put you in the position, to make a meaningful impact on microwave resonator technology

suitable as
  • Bachelor’s Thesis Physics
Supervisor: Hans Hübl
Magnetomechanik mit freischwebenden Nanostrukturen

Nano-mechanical strings are archetypical harmonic oscillators and can be straightforwardly integrated with other nanoscale systems. For example, the field of nano-electromechanics studies the coupling of nano-strings to microwave circuits, which resulted in the creation of mechanical quantum states and concepts for microwave to optics conversion. Here, we plan to investigate an alternative hybrid system based on ferromagnetic nanostructures integrated with nano-strings or nano-mechanical platforms. These hybrid devices enable the design and the investigation of spin-phonon coupling down to the single excitation level and are expected to allow the investigation of the Einstein-de Haas on the nanoscale, where the angular momentum change arising from magnetization reversal is transferred into a mechanical vibration of the beam. In addition, these systems are key for the investigation of strong magnon-phonon coupling.

We are looking for a motivated master student for a nano-mechanical master thesis in the context of magnon-phonon interaction. The goal of your project is to investigate the static and dynamic interplay between the mechanical and magnetic properties of a nano-mechanical system sharing an interface with a magnetic layer. In your thesis project you will fabricate freely suspended nanostructures based on silicon nitride or silicon and deposit on them ferromagnetic multi layers using state-of-the-art nano-lithography and metal deposition techniques. Further, you will probe the mechanical response of the nano-structures using optical interferometry while exciting the magnetization dynamics of the magnetic system

suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
  • Master’s Thesis Quantum Science & Technology
Supervisor: Hans Hübl
Nano-strings excited by magnetic torques

Nano-mechanical beams are prototype harmonic oscillators, and can be straightforwardly integrated with other nanoscale systems. For example, coupling nano-beams to coplanar microwave cavities yields so-called hybrid electro-mechanical systems with intriguing properties, e.g., electro-mechanically induced transparency. In a similar fashion, ferromagnetic nanostructures can be integrated with nano-beams. This enables the design and the investigation of spin-phonon coupling down to the single excitation level, or nanoscale Einstein-de Haas experiments, in which the angular momentum change arising from magnetization reversal is transferred into a mechanical vibration of the beam. 

We are looking for a motivated master student for a magnetic nano-beam oriented master thesis. The goal of your project is to investigate the static and dynamic interplay between the mechanical properties of double layer nano-beams and its magnetic properties. In your thesis project you will fabricate freely suspended nanostructures based on silicon nitride and ferromagnetic multi layers using state-of-the-art nano-lithography and metal deposition techniques. Further, you will probe the mechanical response of the nano-structures using optical interferometry while exciting the magnetization dynamics of the magnetic system. 

 
suitable as
  • Master’s Thesis Condensed Matter Physics
  • Master’s Thesis Applied and Engineering Physics
Supervisor: Rudolf Gross
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