M. Klein
University of Würzburg
10 Papers
33 Citations
M. Klein is an academic researcher from University of Würzburg. The author has contributed to research in topics: Angle-resolved photoemission spectroscopy & Quasiparticle. The author has an hindex of 6, co-authored 10 publications.
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Papers
Signature of Quantum Criticality in Photoemission Spectroscopy
TL;DR: It is shown theoretically that this step is expected from a highly nonlinear renormalization of the local spin coupling at each Ce site, induced by spin fluctuations on neighboring sites, and provides a general high-temperature indicator for heavy-fermion quasiparticle breakdown at a quantum phase transition.
45
Coherent Heavy Quasiparticles in a CePt5 Surface Alloy
M. Klein,A. Nuber,H. Schwab,C. Albers,N. Tobita,Mitsuharu Higashiguchi,J. Jiang,S. Fukuda,Kazuma Tanaka,Kenya Shimada,M. Mulazzi,Fakher F. Assaad,Friedrich Reinert,Friedrich Reinert +13 more
TL;DR: The temperature dependence of the spectra show the formation of the coherent low-energy heavy-fermion band near the Fermi level, supported by a multiband model calculation in the framework of the dynamical mean-field theory.
Photoemission spectroscopy across the semiconductor-to-metal transition in FeSi
TL;DR: In this article, high-resolution angle-resolved photoemission spectroscopy (ARPES) was performed on high-purity FeSi single crystals and the results showed that the self-energy resulting from electronic correlation effects leads to a strong renormalization of the energy bands in the vicinity of the Fermi energy.
12
The surface state of URu2Si2
F. L. Boariu,A. Nuber,Andrés F. Santander-Syro,Andrés F. Santander-Syro,M. Klein,Frank Förster,Pascal Lejay,Friedrich Reinert +7 more
TL;DR: In this paper, the authors used high-resolution angle-resolved photoemission spectroscopy (ARPES) to find that a hole-like band around Γ having its band maximum at E −35meV, and previously thought to be a bulk band of the system, is indeed a surface state not related to the HO phase transition.
8
High-temperature signatures of quantum criticality in heavy-fermion systems.
TL;DR: In this article, the complete spin screening of Kondo ions can be suppressed by the Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling to the surrounding magnetic ions even without magnetic ordering and the signature of this suppression can be observed in spectroscopic measurements above the magnetic ordering temperature.