Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant No. 21603210), Chinese Youth 1000 Talents Program, the Fundamental Research Funds for the Central Universities, and the United States Department of Energy Basic Energy Sciences (Grant No. DE-FG02-04ER46148). We also thank the Supercomputing Center at University of Science and Technology of China, National Energy Research Scientific Computing Center and Center for High Performance Computing at University of Utah for providing the computing resources.

References

[1] Clarke R., Uher C.. Adv. Phys., 1984, 33: 469 CrossRef Google Scholar http://scholar.google.com/scholar_lookup?author=Clarke R.&author=Uher C.&publication_year=1984&journal=Adv. Phys.&volume=33&pages=469

[2] K. Nasu, Photoinduced Phase Transitions (World Scientific, Hackensack, 2004). Google Scholar http://scholar.google.com/scholar_lookup?title=K. Nasu, Photoinduced Phase Transitions (World Scientific, Hackensack, 2004)&

[3] Kanasaki J., Inami E., Tanimura K., Ohnishi H., Nasu K.. Phys. Rev. Lett., 2009, 102: 087402 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Kanasaki J.&author=Inami E.&author=Tanimura K.&author=Ohnishi H.&author=Nasu K.&publication_year=2009&journal=Phys. Rev. Lett.&volume=102&pages=087402

[4] Raman R. K., Murooka Y., Ruan C. Y., Yang T., Berber S., Tománek D.. Phys. Rev. Lett., 2008, 101: 077401 CrossRef ADS arXiv Google Scholar http://scholar.google.com/scholar_lookup?author=Raman R. K.&author=Murooka Y.&author=Ruan C. Y.&author=Yang T.&author=Berber S.&author=Tománek D.&publication_year=2008&journal=Phys. Rev. Lett.&volume=101&pages=077401

[5] Hu H., Liu M., Wang Z. F., Zhu J., Wu D., Ding H., Liu Z., Liu F.. Phys. Rev. Lett., 2012, 109: 055501 CrossRef ADS arXiv Google Scholar http://scholar.google.com/scholar_lookup?author=Hu H.&author=Liu M.&author=Wang Z. F.&author=Zhu J.&author=Wu D.&author=Ding H.&author=Liu Z.&author=Liu F.&publication_year=2012&journal=Phys. Rev. Lett.&volume=109&pages=055501

[6] Nielsen O. H., Martin R. M.. Phys. Rev. Lett., 1983, 50: 697 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Nielsen O. H.&author=Martin R. M.&publication_year=1983&journal=Phys. Rev. Lett.&volume=50&pages=697

[7] Tao J., Vignale G., Tokatly I. V.. Phys. Rev. Lett., 2008, 100: 206405 CrossRef ADS arXiv Google Scholar http://scholar.google.com/scholar_lookup?author=Tao J.&author=Vignale G.&author=Tokatly I. V.&publication_year=2008&journal=Phys. Rev. Lett.&volume=100&pages=206405

[8] Hu H., Gao H. J., Liu F.. Phys. Rev. Lett., 2008, 101: 216102 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Hu H.&author=Gao H. J.&author=Liu F.&publication_year=2008&journal=Phys. Rev. Lett.&volume=101&pages=216102

[9] Zhu J., Liu F., Stringfellow G. B., Wei S. H.. Phys. Rev. Lett., 2010, 105: 195503 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Zhu J.&author=Liu F.&author=Stringfellow G. B.&author=Wei S. H.&publication_year=2010&journal=Phys. Rev. Lett.&volume=105&pages=195503

[10] Huang B., Liu M., Su N., Wu J., Duan W., Gu B. L., Liu F.. Phys. Rev. Lett., 2009, 102: 166404 CrossRef ADS arXiv Google Scholar http://scholar.google.com/scholar_lookup?author=Huang B.&author=Liu M.&author=Su N.&author=Wu J.&author=Duan W.&author=Gu B. L.&author=Liu F.&publication_year=2009&journal=Phys. Rev. Lett.&volume=102&pages=166404

[11] Liu M., Han Y., Tang L., Jia J. F., Xue Q. K., Liu F.. Phys. Rev. B, 2012, 86: 125427 CrossRef ADS arXiv Google Scholar http://scholar.google.com/scholar_lookup?author=Liu M.&author=Han Y.&author=Tang L.&author=Jia J. F.&author=Xue Q. K.&author=Liu F.&publication_year=2012&journal=Phys. Rev. B&volume=86&pages=125427

[12] Kresse G., Hafner J.. Phys. Rev. B, 1993, 47: 558 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Kresse G.&author=Hafner J.&publication_year=1993&journal=Phys. Rev. B&volume=47&pages=558

[13] N. W. Ashcroft, and N. D. Mermin, Solid State Physics (Harcourt, New York, 1976). Google Scholar http://scholar.google.com/scholar_lookup?title=N. W. Ashcroft, and N. D. Mermin, Solid State Physics (Harcourt, New York, 1976)&

[14] Van de Walle C. G., Martin R. M.. Phys. Rev. B, 1987, 35: 8154 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Van de Walle C. G.&author=Martin R. M.&publication_year=1987&journal=Phys. Rev. B&volume=35&pages=8154

[15] Scandolo S., Bernasconi M., Chiarotti G. L., Focher P., Tosatti E.. Phys. Rev. Lett., 1995, 74: 4015 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Scandolo S.&author=Bernasconi M.&author=Chiarotti G. L.&author=Focher P.&author=Tosatti E.&publication_year=1995&journal=Phys. Rev. Lett.&volume=74&pages=4015

[16] Tateyama Y., Ogitsu T., Kusakabe K., Tsuneyuki S.. Phys. Rev. B, 1996, 54: 14994 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Tateyama Y.&author=Ogitsu T.&author=Kusakabe K.&author=Tsuneyuki S.&publication_year=1996&journal=Phys. Rev. B&volume=54&pages=14994

[17] Meng S., Ren J., Kaxiras E.. Nano Lett., 2008, 8: 3266 CrossRef ADS Google Scholar http://scholar.google.com/scholar_lookup?author=Meng S.&author=Ren J.&author=Kaxiras E.&publication_year=2008&journal=Nano Lett.&volume=8&pages=3266