TY  - RPRT
TI  - Gapless Criterion for Crystals from Effective Axion Field
AU  - Yu, Jiabin
AU  - Song, Zhi-Da
AU  - Liu, Chao-Xing
PY  - 2020
DO  - 10.1103/physrevlett.125.036401
UR  - https://www.osti.gov/biblio/1783182
ID  - 1783182
ER  -