Motoharu Kitatani Liang Si Oleg Janson Ryotaro Arita Zhicheng Zhong Karsten Held
npj Quantum Materials 2020年8月 [査読有り]
Following the discovery of superconductivity in the cuprates and the seminal
work by Anderson, the theoretical efforts to understand high-temperature
superconductivity have been focusing to a large extent on a simple model: the
one-band Hubbard mo...
While multiband systems are usually considered for flat-band physics, here we study one-band models that have flat portions in the dispersion to explore correlation effects in the 2D repulsive Hubbard model in an intermediate coupling regime. The ...
T. Schäfer A. A. Katanin M. Kitatani A. Toschi K. Held
Physical Review Letters 122(22) 2019年6月 [査読有り]
We study the phase diagram and quantum critical region of one of the fundamental models for electronic correlations: the periodic Anderson model. Employing the recently developed dynamical vertex approximation, we find a phase transition between a...
Motoharu Kitatani Thomas Schäfer Hideo Aoki Karsten Held
Physical Review B 99(4) 2019年1月 [査読有り]
To fathom the mechanism of high-temperature () superconductivity, the dynamical vertex approximation (DA) is evoked for the two-dimensional repulsive Hubbard model. After showing that our results well reproduce the cuprate phase...
Interplay of Pomeranchuk instability (spontaneous symmetry breaking of the Fermi surface) and d-wave superconductivity is studied for the repulsive Hubbard model on the square lattice with the dynamical mean-field theory combined with the fluctuat...
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理学研究科