41 citations · 58 across the 3 of their papers we have counts for
5 papers · 1 filter
Insights into the Electron-Electron Interaction from Quantum Monte Carlo Calculations
Carl A. Kukkonen, Kun Chen
The effective electron-electron interaction in the electron gas depends on both the density and spin local field factors. Variational Diagrammatic Quantum Monte Carlo calculations…
Fermionic Sign Structure of High-order Feynman diagrams in a Many-fermion System
Bao-Zong Wang, Peng-Cheng Hou, Youjin Deng +2
The sign cancellation between scattering amplitudes makes fermions different from bosons. We systematically investigate Feynman diagrams' fermionic sign structure in a representati…
Even-Odd effect of an Spin-S impurity coupled to a quantum critical system
Kun Chen, Yashar Komijani
We discuss an even-odd effect for an impurity with an -fold degenerate internal states immersed in a two-dimensional superfluid--Mott-insulator quantum critical bath, which is d…
The halon: a quasiparticle featuring critical charge fractionalization
Kun Chen, Yuan Huang, Youjin Deng +1
The halon is a special critical state of an impurity in a quantum-critical environment. The hallmark of the halon physics is that a well-defined integer charge gets fractionalized…
Trapping Collapse
Kun Chen, Nikolay V. Prokof'ev, Boris V. Svistunov
Weak potential wells (or traps) in one and two dimensions, and the potential wells slightly deeper than the critical ones in three dimensions, feature shallow bound states with loc…