Signature of topological quantum phase transitions via Wigner-Yanase skew information W. W. Cheng, Z. Z. Du, L. Y. Gong, S. M. Zhao and J.-M. Liu EPL, 108 4 (2014) 46003 Published online: 19 November 2014 DOI: 10.1209/0295-5075/108/46003