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Shenglong Xu
College Station TAMU
Faculty: Research Assistant Professor

Shenglong Xu

Biography

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

Tianci Zhou, Shenglong Xu, Xiao Chen, Andrew Guo, and Brian Swingle. “Operator Lévy Flight: Light Cones in Chaotic Long-Range Interacting Systems.” Phys. Rev. Lett., 124(18), 180601, May 2020.

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.

Subhayan Sahu, Shenglong Xu, and Brian Swingle. “Scrambling Dynamics across a Thermalization-Localization Quantum Phase Transition.” Phys. Rev. Lett., 123(16), 165902, Oct 2019.

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

Shenglong Xu, Yi Li, and Congjun Wu. “Sign-Problem-Free Quantum Monte Carlo Study on Thermodynamic Properties and Magnetic Phase Transitions in Orbital-Active Itinerant Ferromagnets.” Phys. Rev. X, 5(2), 021032, Jun 2015.

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