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# Delocalization of random band matrices in high dimensions

## [HYBRID WORKSHOP] Connections and Introductory Workshop: Universality and Integrability in Random Matrix Theory and Interacting Particle Systems, Part 1 August 23, 2021 - August 27, 2021

August 26, 2021 (12:00 PM PDT - 01:00 PM PDT)
Speaker(s): Jun Yin (University of California, Los Angeles)
Location: MSRI: Online/Virtual
Primary Mathematics Subject Classification No Primary AMS MSC
Secondary Mathematics Subject Classification No Secondary AMS MSC
Video

#### Delocalization Of Random Band Matrices In High Dimensions

Abstract

One famous conjecture in quantum chaos and random matrix theory is the so-called phase transition conjecture of random band matrices. It predicts that the eigenvectors' localization-delocalization transition occurs at some critical bandwidth $\mathrm{Wc}(\mathrm{d})$, which depends on the dimension $\mathrm{d}$. The well-known Anderson model and Anderson conjecture have a similar phenomenon. It is widely believed that $\mathrm{Wc}(\mathrm{d})$ matches $1 / \lambda \mathrm{c}(\mathrm{d})$ in the Anderson conjecture, where $\lambda \mathrm{c}(\mathrm{d})$ is the critical coupling constant. Furthermore, this random matrix eigenvector phase transition coincides with the local eigenvalue statistics phase transition, which matches the Bohigas-Giannoni-Schmit conjecture in quantum chaos theory. We proved the eigenvector's delocalization property for most of the general $d>=8$ random band matrix as long as the size of this random matrix does not grow faster than its bandwidth polynomially. In other words, as long as bandwidth $W$ is larger than $L^ \epislon$ for some $epislon$>0\$. It is joint work with H.T. Yau (Harvard) and F. Yang (Upenn).

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#### Delocalization Of Random Band Matrices In High Dimensions

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