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Mott physics, sign structure, and high-TC superconductivity

Weng, ZY (Tsinghua University)
Monday 16 September 2013, 11:00-11:45

Seminar Room 1, Newton Institute


Fermion sign structure constitutes the foundation of the Landauís Fermi liquid theory in condensed matter physics. But it will be fundamentally changed by the strong interaction in the so-called doped Mott insulator relevant to high-Tc cuprate materials. New novel sign structure as reduced Fermion signs will appear here, which can be precisely captured by a nonintegrable phase factor like emergent topological gauge fields in the simplest doped Mott insulators: the t-J and Hubbard models. The quantum interference of the altered Fermion signs will result in non-Fermi-liquid/non-BCS-type normal/superconducting phenomena, which may provide a systematical understanding of the anomalous properties observed in cuprate superconductors.




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