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날짜 2023-07-12 11:00 
일시 July 12th(Wed), 11:00AM 
장소 E6-2, #1323 
연사 Prof. Ying-Jer Kao(National Taiwan University) 

물리학과에서는 아래와 같이 세미나를 개최하고자 하오니 관심있는 분들의 많은 참석 부탁드립니다.


Date: 11:00 Am, 12th July (Wed)
Place: E6, #1323
Speaker: Prof. Ying-Jer Kao(National Taiwan University)
Title: Study of spin-1/2 antiferromagnetic  kagome Heisenberg model  by symmetric projected entangled simplex states


We utilize symmetric projected entangled simplex states (PESS) to classify possible $\mathbb{Z}_2$ spin liquid phases based on  the short-range physics associated with the fractionalization of both the on-site and space-group symmetries. We numerically obtain the optimal $\mathbb{Z}_2$ ground state of the nearest-neighbor spin-1/2 antiferromagnetic Heisenberg model on the kagome lattice.   Using variational simple update and the corner transfer matrix renormalization group, we show the four RVB states converge to different energy levels and the $0$-flux(I) state has the lowest energy. The excitation spectrum, however, indicates  softening of the fermionic excitation, which suggests a possible transition to a closeby $U(1)$ Dirac spin liquid. 

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