11/25 Entanglement, non-unitary conformal field theories, and non-Hermitian quantum systems

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Time: 1:20pm~3:10pm, November 25 (Thursday)
Title: Entanglement, non-unitary conformal field theories, and non-Hermitian quantum systems

Speaker: Prof. Po-Yau Chang
(Department of Physics, National Tsing Hua University)
Place: Science Building III 1F SC157

Abstract:

Entanglement is a powerful tool to diagnose many-body quantum systems. The triumph examples are the critical systems where the low energy property can be described by conformal field theories (CFTs). The central charge which uniquely characterizes the CFT can be perfectly extracted from the entanglement entropy. However, the entanglement properties for non-unitary CFTs are not well understood. Moreover, the microscopic models of fermionic systems which can be described by non-unitary CFTs have not been explored. In this colloquium, I would like to demonstrate several non-Hermitian fermionic systems which can be described by non-unitary CFTs, and show their entanglement properties can be correctly obtained by our proposed generic entanglement entropy.