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Prof. Elena Hassinger


Unconventional metals show a number of novel states of matter at low temperature that cannot be understood within an established quantum mechanical treatment. Examples are unusual ordered phases, non-Fermi-liquid behavior and unconventional superconductivity. It is the interaction (correlation) between the electrons, which makes these interesting quantum many body states emerge. 

Our group strives for further understanding of these novel states of matter by experimental investigations at very low temperature and under high magnetic field and high pressure. Particularly, we are trying to understand the electronic behavior in novel states of matter through a direct detection of the Fermi surface via quantum oscillations, a fundamental “fingerprint” of a material.

This powerful technique implies the challenge of creating a very low noise environment and requiring extremely pure crystals. It gives information on the 3D Fermi surface topology and anisotropy, quasiparticle effective masses, quasiparticle scattering and magnetic interactions. 

Quantum oscillation measurements will also be carried out under high pressure.  Pressure is a parameter that allows changing the lattice constants and therefore the interaction of the electrons. It is a clean tuning parameter as opposed to chemical substitution where impurities are introduced to the lattice. By tuning the ground states with pressure, we are able to study the interplay and competition of their according order parameters.


Nöthnitzer Str. 40
01187 Dresden

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Ausgeschriebene Angebote für Abschlussarbeiten an der Arbeitsgruppe

Chirale Anomalie gemessen über die Wärmekapazität

Weyl fermions are fundamental particles predicted as a solution of the Dirac equation when there is no gap in the dispersion relation. They usually come in pairs of opposite handedness. In the presence of parallel electric and magnetic fields, the number of left-handed and right-handed particles becomes imbalanced, an effect called chiral anomaly. In Weyl semimetals, electrons behave as Weyl fermions as a consequence of the band structure. In these materials it is predicted that the chiral anomaly should be detectable in the specific heat since it implies reducing the entropy by creating more order. This Master thesis project comprises a check of this theoretical prediction in Weyl semimetals by modifying an existing setup for heat capacity measurements.

The project work will be carried out at the Max Planck Institute for Chemical Physics of Solids in Dresden.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
Themensteller(in): Elena Hassinger
Design und Charakterisierung von Thermometern für Sub-Kelvin Temperaturen für Messungen der thermischen Leitfähigkeit von mikrostrukturierten Proben

Thermal conductivity measurement at very low temperatures is an important tool in studying materials with interesting electronic states (e.g. Weyl semimetals, superconductors). Micro-structured samples of such materials are even more interesting, as the precise control of sample geometry and enhanced aspect ratio enable higher measurement sensitivity. We are currently developing micro-fabricated devices for measuring thermal conductivities of micro-scale samples down to ~100 mK. The project involves developing thin film materials to use in micro-fabricated temperature sensors. The challenge is in finding a material with a suitable response to temperature, as many materials become insensitive to temperature changes below 10 K. The required tasks include characterizing the resistivity of various thin films at cryogenic temperatures and (in collaboration with a thin film deposition expert) identifying a good material and deposition conditions.

The project will be carried out at the Max-Planck Institute for Chemical Physics of Solids in Dresden.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
Themensteller(in): Elena Hassinger
Thermische Leitfähigkeit an Supraleitern bei tiefen Temperaturen und in richtungsvariablem Magnetfeld

We have an experimental setup to measure thermal conductivity of a material under magnetic fields at temperatures 0.05 – 6 K. A vector magnet controls the magnetic field direction. The angular resolutionprovided by this technique is useful for characterizing unconventional superconductors (1). Specifically, the angular dependence can reveal the superconducting gap structure in unconventional superconductors. With the emergence of topological materials (2), there is an opportunity to explore the interplay of topology and superconductivity with this measurement technique. Currently, we have identified a number of materials, in which we suspect unconventional superconductivity. The project involves completing a measurement for one of these materials.

The project will be carried out at the Max-Planck Institute for Chemical Physics of Solids in Dresden.

1.         K. Izawa et al., Angular position of nodes in the superconducting gap of quasi-2D heavy-fermion superconductor CeCoIn5. Phys. Rev. Lett. 87, 057002 (2001).

2.         N. P. Armitage, E. J. Mele, A. Vishwanath, Weyl and Dirac semimetals in three dimensional solids. Rev. Mod. Phys. 90 (2018)

geeignet als
  • Masterarbeit Physik der kondensierten Materie
Themensteller(in): Elena Hassinger
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