[1] P W Anderson. Science, 235, 1196(1987).
[2] A Kitaev. Annals of Physics, 321, 2(2006).
[3] L Balents. Nature, 464, 199(2010).
[4] Y Zhou, K Kanoda, T K Ng. Rev. Mod. Phys, 89(2017).
[5] L Savary, L Balents. Reports on Progress in Physics, 80(2016).
[6] Z Ma, K Ran, J Wang et al. Chin. Phys. B, 27(2018).
[7] P W Anderson. Materials Research Bulletin, 8, 153(1973).
[8] T H Han, J S Helton, S Chu et al. Nature, 492, 406(2012).
[9] Y Shen, Y D Li, H Wo et al. Nature, 540, 559(2016).
[10] C Balz, B Lake, J Reuther et al. Nat. Phys, 12, 942(2016).
[11] B Gao, T Chen, D W Tam et al. Nat. Phys, 15, 1052(2019).
[12] Z Ma, J Wang, Z Y Dong et al. Phys. Rev. Lett, 120(2018).
[13] I Kimchi, A Nahum, T Senthil. Phys. Rev. X, 8(2018).
[14] Z Zhu, P A Maksimov, S R White, A L Chernyshev. Phys. Rev. Lett, 119(2017).
[15] X G Wen. Phys. Rev. B, 65(2002).
[16] A M Essin, M Hermele. Phys. Rev. B, 87(2013).
[17] A M Essin, M Hermele. Phys. Rev. B, 90(2014).
[18] G Chen. Phys. Rev. B, 96(2017).
[19] D C Tsui, H L Stormer, A C Gossard. Phys. Rev. Lett, 48, 1559(1982).
[20] R B Laughlin. Phys. Rev. Lett, 50, 1395(1983).
[21] P A Lee, N Nagaosa, X G Wen. Rev. Mod. Phys, 78, 17(2006).
[22] T Li, F Becca, W Hu, S Sorella. Phys. Rev. B, 86(2012).
[23] L Capriotti, F Becca, A Parola, S Sorella. Phys. Rev. Lett, 87(2001).
[24] S L Yu, W Wang, Z Y Dong, Z J Yao, J X Li. Phys. Rev. B, 98(2018).
[25] W J Hu, F Becca, A Parola, S Sorella. Phys. Rev. B, 88(2013).
[26] H C Jiang, H Yao, L Balents. Phys. Rev. B, 86(2012).
[27] S Sachdev. Phys. Rev. B, 45(1992).
[28] Y D Li, X Yang, Y Zhou, G Chen. Phys. Rev. B, 99(2019).
[29] Y D Li, G Chen. Phys. Rev. B, 96(2017).
[30] Y D Li, Y M Lu, G Chen. Phys. Rev. B, 96(2017).
[31] Y H Gao, G Chen. SciPost Physics Core, 2, 004(2020).
[32] I Dzyaloshinsky. Journal of Physics and Chemistry of Solids, 4, 241(1958).
[33] T Moriya. Phys. Rev, 120, 91(1960).
[34] D Sen, R Chitra. Phys. Rev. B, 51, 1922(1995).
[35] O I Motrunich. Phys. Rev. B, 73(2006).
[36] H Katsura, N Nagaosa, P A Lee. Phys. Rev. Lett, 104(2010).
[37] A M Polyakov. Nuclear Physics B, 120, 429(1977).
[38] T Qin, Q Niu, J Shi. Phys. Rev. Lett, 107(2011).
[39] Y Kasahara, T Ohnishi, Y Mizukami et al. Nature, 559, 227(2018).