Frank Krüger

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Acknowledgments First and foremost I would like to express my gratitude to my supervisor Prof. Manuel Drees for the opportunity to work on the subject of Dark Matter. As a collaborator I have learned to appreciate his profound knowledge of the subject and intuition for the essential as well as his manner of researching and special unique point of views.(More)
The vicinity of quantum phase transitions has proven fertile ground in the search for new quantum phases. We propose a physically motivated and unifying description of phase reconstruction near metallic quantum-critical points using the idea of quantum order by disorder. Certain deformations of the Fermi surface associated with the onset of competing order(More)
– Recently it was argued that quantum phase transitions can be radically different from classical phase transitions with as a highlight the 'deconfined critical points' exhibiting fractionalization of quantum numbers due to Berry phase effects. Such transitions are supposed to occur in frustrated ('J1-J2') quantum magnets. We have developed a novel(More)
We demonstrate that the interplay between soft electronic particle-hole fluctuations and magnetic anisotropies can drive ferromagnetic moments to point along a magnetic hard axis. As a proof of concept, we show this behavior explicitly for a generic two-band model with local Coulomb and Hund's interactions and a spin-orbit-induced easy plane anisotropy. The(More)
SUMMARY It has recently been shown that correlations of seismic noise can contain significant information about the Green's function along the station profile. Using an array of 38 temporary broadband stations located in Finland between September 1998 and March 1999, we study the resulting 703 noise correlations to understand how they are influenced by the(More)
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