12 citations · 66 across the 14 of their papers we have counts for
4 papers · 1 filter
Tensor network algorithm to solve polaron impurity problems
Ruofan Chen, Lei Gu, Chu Guo
The polaron problem is a very old problem in condensed matter physics that dates back to the thirties, but still remain largely unsolved today, especially when electron-electron in…
Scalable tensor network algorithm for quantum impurity problems
Zhijie Sun, Ruofan Chen, Zhenyu Li +1
The Grassmann time-evolving matrix product operator method has shown great potential as a general-purpose quantum impurity solver, as its numerical errors can be well-controlled an…
Path Integral Formalism for Quantum Open Systems
Ruofan Chen
This article provides a detailed derivation of the path integral formalism for both boson and fermion quantum open systems using coherent states. The formalism on the imaginary-tim…
An Algebraic Proof of Thermal Wick's Theorem
Ruofan Chen
Every many-body state can be constructed from the vacuum state by iteratively applying the creation operators, therefore the thermal expectation can be transformed into a sum of va…