【直播】【青年科学半月谈】Non-Hermitian Parent Hamiltonian and Composite……

活动名称：

Non-Hermitian Parent Hamiltonian and Composite Quantum Phases

活动时间：

2023年4月27日（周四）10:00

报告嘉宾：

Yuchen Guo

主办单位：

蔻享学术

直播通道

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报告人介绍

Yuchen Guo

Yuchen Guo is an undergraduate student in the Department of Physics, Tsinghua University, under the supervision of Prof. Shuo Yang. His major research interests include quantum entanglement, quantum error mitigation, interacting topological systems, and tensor networks.

报告简介

In this talk, I plan to introduce our two recent works (arXiv: 2301.12448, arXiv: 2304.04588) on non-Hermitian interacting spin systems. I will begin with introducing the basic concept of tensor networks, and the conventional parent Hamiltonian method for Hermitian systems. Next, I will discuss our proposed non-Hermitian parent Hamiltonian (nH-PH), where one can start from two different matrix product states (MPS) and construct a local Hamiltonian such that these states are zero-energy modes. I will then introduce a class of new topological phases in non-Hermitian interacting systems without Hermitian counterparts, denoted as composite quantum phases. With the nH-PH approach, we construct a spin-1 model to realize this type of exotic phases. I will finally show the phase diagram of our model and demonstrate that such novel phases can exist extensively in non-Hermitian systems.

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编辑：吴良秀

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