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Shenglong Xu
TAMU College Station
Faculty: Research Assistant Professor

Shenglong Xu


I obtained my Ph.D. from the University of California, San Diego, in 2017. After a three-year-long postdoc at the University of Maryland, I joined Texas A&M in 2020. My research area is condensed matter theory and quantum many-body physics, which, broadly speaking, studies the emergent collective behavior of many particles that interact with each other following the law of quantum mechanics.

My current research interest focuses on quantum many-body dynamics. During unitary time evolution, a simple initial quantum state typically becomes more and more complicated due to the rapid generation of entanglement entropy. I am interested in understanding the growth of the complexity and the entanglement structure in generic quantum systems, for instance, thermalization and scrambling dynamics. I'm also interested in designing quantum protocols consisting of unitary operations and measurements to control the quantum dynamics and engineer quantum states with interesting entanglement structures.

One of my other interests is developing efficient numerical algorithms to simulate quantum many-body systems. Because of the large Hilbert space, it is intractable to simulate a quantum many-body system on a classical computer exactly. Nevertheless, in many cases, the behavior of local observables of the quantum state, such as charge and energy, are more important than the state itself. The goal is to develop efficient algorithms, such as quantum Monte Carlo, tensor networks, and machine learning, to understand the behavior of the local observables without the full knowledge of the state.

Selected Publications

Lakshya Agarwal and Shenglong Xu. “Emergent symmetry in Brownian SYK models and charge dependent scrambling.” Journal of High Energy Physics, 2022(2), Feb 2022.

Christopher M. Langlett, Zhi-Cheng Yang, Julia Wildeboer, Alexey V. Gorshkov, Thomas Iadecola, and Shenglong Xu. “Rainbow scars: From area to volume law.” Physical Review B, 105(6), Feb 2022.

Christopher M. Langlett and Shenglong Xu. “Hilbert space fragmentation and exact scars of generalized Fredkin spin chains.” Phys. Rev. B, 103(22), L220304, Jun 2021.

Josiah Couch, Stefan Eccles, Phuc Nguyen, Brian Swingle, and Shenglong Xu. “Speed of quantum information spreading in chaotic systems.” Phys. Rev. B, 102(4), 045114, Jul 2020.

Shenglong Xu and Brian Swingle. “Locality, Quantum Fluctuations, and Scrambling.” Phys. Rev. X, 9(3), 031048, Sep 2019.

Shenglong Xu and Brian Swingle. “Accessing scrambling using matrix product operators.” Nature Physics, 16(2), 199--204, Nov 2019.

Shenglong Xu, Xiao Li, Yi-Ting Hsu, Brian Swingle, and S. Das Sarma. “Butterfly effect in interacting Aubry-Andre model: Thermalization, slow scrambling, and many-body localization.” Physical Review Research, 1(3), Dec 2019.

Shenglong Xu, Julio T. Barreiro, Yu Wang, and Congjun Wu. “Interaction Effects with Varying N in SU(N) Symmetric Fermion Lattice Systems.” Phys. Rev. Lett., 121(16), 167205, Oct 2018.

Zhe Wang, Jianda Wu, Wang Yang, Anup Kumar Bera, Dmytro Kamenskyi, A. T. M. Nazmul Islam, Shenglong Xu, Joseph Matthew Law, Bella Lake, Congjun Wu, and Alois Loidl. “Experimental observation of Bethe strings.” Nature, 554(7691), 219--223, Feb 2018.

Shenglong Xu and Congjun Wu. “Space-Time Crystal and Space-Time Group.” Phys. Rev. Lett., 120(9), 096401, Feb 2018.

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