Zheng-Yu Weng Mott Physics: Elephant in the Living Room and a Couple of Examples 10/19/2022

Title: Mott Physics: Elephant in the Living Room and a Couple of Examples
Speaker: Prof. Zheng-Yu Weng (Tsinghua University)
Time: Oct. 19 (Wed.), 10:00
Place: Rm M830, IOP-CAS
Abstract: In the Landau paradigm for semiconductors and metals, the Fermi statistics is essential to organize the electrons into a condensate of Fermi liquid or BCS superconductivity. However, in a strongly correlated electron system with opening up a Mott gap, the Hilbert space is fundamentally changed with a new sign structure emerging to replace the Fermi signs. To illustrate the novel consequences, I will discuss the single-hole and two-hole wavefunctions as the simplest possible examples of doped Mott insulators, which can account for all the nontrivial features as measured by exact numerical calculations. These accurate analytic wavefunctions can thus show how the basic physics of a doped Mott insulator is so different from what one would expect from a Landau quasiparticle picture or a BCS pairing mechanism via exchanging bosonic modes. Important implications to understanding the high-TC superconductors will be briefly addressed.


附件: