456 citations · 3.3k across the 66 of their papers we have counts for
9 papers · 1 filter
A two-way approach to out-of-time-order correlators
Yingfei Gu, Alexei Kitaev, Pengfei Zhang
Out-of-time-order correlators (OTOCs) are a standard measure of quantum chaos. Of the four operators involved, one pair may be regarded as a source and the other as a probe. A usua…
An obstacle to sub-AdS holography for SYK-like models
Pengfei Zhang, Yingfei Gu, Alexei Kitaev
We argue that "stringy" effects in a putative gravity-dual picture for SYK-like models are related to the branching time, a kinetic coefficient defined in terms of the retarded ker…
More on Complex Sachdev-Ye-Kitaev Eternal Wormholes
Pengfei Zhang
In this work, we study a generalization of the coupled Sachdev-Ye-Kitaev (SYK) model with charge conservations. The model contains two copies of the complex SYK model at dif…
Entanglement Entropy and its Quench Dynamics for Pure States of the Sachdev-Ye-Kitaev model
Pengfei Zhang
Sachdev-Ye-Kitaev (SYK) is a concrete solvable model with non-Fermi liquid behavior and maximal chaos. In this work, we study the entanglement Rényi entropy for the subsystems of t…
Replica wormhole and information retrieval in the SYK model coupled to Majorana chains
Yiming Chen, Xiao-Liang Qi, Pengfei Zhang
Motivated by recent studies of the information paradox in (1+1)-D anti-de Sitter spacetime with a bath described by a (1+1)-D conformal field theory, we study the dynamics of secon…
The Coupled SYK model at Finite Temperature
Xiao-Liang Qi, Pengfei Zhang
Sachdev-Ye-Kitaev (SYK) model, which describes randomly interacting Majorana fermions in 0+1 dimension, is found to be an solvable UV-complete toy model for holographic duality…
Size of bulk fermions in the SYK model
Yuri D. Lensky, Xiao-Liang Qi, Pengfei Zhang
The study of quantum gravity in the form of the holographic duality has uncovered and motivated the detailed investigation of various diagnostics of quantum chaos. One such measure…
Entanglement Entropy of Two Coupled SYK Models and Eternal Traversable Wormhole
Yiming Chen, Pengfei Zhang
In this paper, we study the entanglement entropy between two SYK systems with bilinear coupling. We use the replica trick to calculate the entanglement entropy in the ground state.…
Tunable Quantum Chaos in the Sachdev-Ye-Kitaev Model Coupled to a Thermal Bath
Yiming Chen, Hui Zhai, Pengfei Zhang
The Sachdev-Ye-Kitaev (SYK) model describes Majorana fermions with random interaction, which displays many interesting properties such as non-Fermi liquid behavior, quantum chaos,…