5 papers
Unveiling quantum criticality of disordered Aubry-André-Harper models via typical fidelity susceptibility
Tian-Cheng Yi, Ying-Ying Fang, Wen Chen +2
In this study, we investigate the localization transition and quantum criticality {in the ground state of the} disordered Aubry-André-Harper (AAH) model, where a quasiperiodic pot…
An Improvement of AmpRed: Analytic Continuation of Complex Integrals
Wen Chen
The AmpRed package has been updated with an improved method for analytic continuation of complex integrals. Compared to the previous version, the new implementation significantly e…
Semi-automatic Calculations of Multi-loop Feynman Amplitudes with AmpRed
Wen Chen
We present a Mathematica package AmpRed for the semi-automatic calculations of multi-loop Feynman amplitudes with high efficiency and precision. AmpRed implements the methods of in…
A Representation Transformation of Parametric Feynman Integrals
Wen Chen
A transformation on homogeneous polynomials is proposed, which is further applied to parametric Feynman integrals. The two representations related through this transformation are d…
Unregulated Divergences of Feynman Integrals
Wen Chen
Feynman integrals can be expanded asymptotically with respect to some small parameters at the integrand level, a technique known as the expansion by regions. A naive expansion by r…