Wilhelm and Else Heraeus Dissertation Prize 2021
The Wilhelm and Else Heraeus Dissertation Prize for the Department of Physics for 2021 will be awarded to Dr Fabian Eickhoff.
Dr. Eickhoff developed a mapping of strongly correlated electron systems onto an effective cluster model [1,2] under supervision of Prof. Anders. For the first time, this mapping allows to systematically separate the the Ruder-Kittel-Kasuya-Yoshida (RKKY) interaction into an ferromagnetic part and an anti-ferromagnet part. His paper  on that subject was highlighted by the Physical Review B as Editors' suggestion. In two subsequent publications [3,4] he pointed out that an analytic prediction can be made to distinguish between a local pseudo-gap spectrum and a finite density of states in the Kondo insulator regime by applying an extended Lieb-Mattis theorem . This allows novel insights on the emerging local moments and their potential screening in the Kondo-hole problem .
Furthermore, Dr. Eickhoff significantly contributed to the development of a many-body theory with predictive power for inelastic electron-tunneling spectroscopy probing strongly correlated many-body systems by scanning tunneling microscopy. This approach  was applied to understand the influence of molecular vibrations onto scanning tunneling data of NTCDA molecules on a silver surface.
 "Effective low-energy description of the two impurity Anderson model: RKKY interaction and quantum criticality", Fabian Eickhoff, Benedikt Lechtenberg and Frithjof B. Anders, Phys. Rev. B 98, 115103 (2018)
 "Strongly correlated multi-impurity models: The crossover from a single-impurity problem to lattice models", Fabian Eickhoff, Frithjof B. Anders, Phys. Rev. B 102, 205132 (2020)
 "Spectral properties of strongly correlated multi impurity models in the Kondo insulator regime: Emergent coherence, metallic surface states and quantum phase transitions", Fabian Eickhoff and Frithjof B. Anders, Phys. Rev. B 104, 165105 (2021)
 "Kondo holes in strongly correlated impurity arrays: RKKY driven Kondo screening and hole-hole interactions", Fabian Eickhoff, Frithjof B. Anders, Phys. Rev. B 104, 045115 (2021)
 "Inelastic electron tunneling spectroscopy for probing strongly correlated many-body systems by scanning tunneling microscopy", Fabian Eickhoff, et al, Phys. Rev. B 101, 125405 (2020)