Yingfei Gu

Publications42
h-index16
Citations1,217
Highly Influential Citations73
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Thermoelectric transport in disordered metals without quasiparticles: The Sachdev-Ye-Kitaev models and holography
We compute the thermodynamic properties of the Sachdev-Ye-Kitaev (SYK) models of fermions with a conserved fermion number Q. We extend a previously proposed Schwarzian effective action to include a…
Local criticality, diffusion and chaos in generalized Sachdev-Ye-Kitaev models
A bstractThe Sachdev-Ye-Kitaev model is a (0 + 1)-dimensional model describing Majorana fermions or complex fermions with random interactions. This model has various interesting properties such as…
Spread of entanglement in a Sachdev-Ye-Kitaev chain
A bstractWe study the spread of Rényi entropy between two halves of a Sachdev-Ye-Kitaev (SYK) chain of Majorana fermions, prepared in a thermofield double (TFD) state. The SYK chain model is a model…
Fractional statistics and the butterfly effect
A bstractFractional statistics and quantum chaos are both phenomena associated with the non-local storage of quantum information. In this article, we point out a connection between the butterfly…
Notes on the complex Sachdev-Ye-Kitaev model
We describe numerous properties of the Sachdev-Ye-Kitaev model for complex fermions with N  ≫ 1 flavors and a global U(1) charge. We provide a general definition of the charge in the ( G, Σ)…
Energy diffusion and the butterfly effect in inhomogeneous Sachdev-Ye-Kitaev chains
We compute the energy diffusion constant $D$, Lyapunov time $\tau_{\text{L}}$ and butterfly velocity $v_{\text{B}}$ in an inhomogeneous chain of coupled Majorana Sachdev-Ye-Kitaev (SYK) models in the…
On the relation between the magnitude and exponent of OTOCs
A bstractWe derive an identity relating the growth exponent of early-time OTOCs, the pre-exponential factor, and a third number called “branching time”. The latter is defined within the dynamical…
Emergent Spatial Structure and Entanglement Localization in Floquet Conformal Field Theory
We study the energy and entanglement dynamics of $(1+1)$D conformal field theories (CFTs) under a Floquet drive with the sine-square deformed (SSD) Hamiltonian. Previous work has shown this model…
Holographic entanglement renormalization of topological insulators
We study the real-space entanglement renormalization group flows of topological band insulators in (2+1) dimensions by using the continuum multiscale entanglement renormalization ansatz (cMERA).…
Eigenstate entanglement in the Sachdev-Ye-Kitaev model
We study the entanglement entropy of eigenstates (including the ground state) of the Sachdev-Ye-Kitaev model. We argue for a volume law, whose coefficient can be calculated analytically from the…
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