for studying the onset of antiferromagnetic order in metals: this yields a phase diagram with high temperature superconductivity similar to that found in many materials, and has led to much subsequent work describing the origin of high temperature superconductivity in realistic models of various materials. Nematic order was predicted for the iron-based superconductors, and a new type of charge density wave, a d-form factor density wave, was predicted for the hole-doped cuprates; both have been observed in numerous experiments. The pseudogap metal of the hole-doped cuprates was argued to be a metal with topological order, as discussed above, based partly on its natural connection to the d-form factor density wave. Soon after, the remarkable experiments of Badoux et al. displayed evidence for a small Fermi surface state with topological order near optimal doping in YBCO, consistent with the overall theoretical picture presented in Sachdev's work. References External links List of Publications on the arXiv YouTube channel of Subir Sachdev with video lectures Living people Harvard University faculty 20th-century Indian physicists MIT Department of Physics alumni Harvard University alumni IIT Delhi alumni Indian theoretical physicists Members of the United States National Academy of Sciences Foreign Fellows of the Indian National Science Academy American academics of Indian descent Scientists from Bangalore Kendriya Vidyalaya alumni Sloan Research Fellows Indian condensed matter physicists Fellows of the American Physical Society 1961 births Indian scholars