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      Higher-Order Topological Insulators 

      Schindler, Frank; Cook, Ashley M.; García Vergniory, Maia; Wang, Zhijun; Parkin, Stuart S. P.; Bernevig, B. Andrei; Neupert, Titus (American Association for the Advancement of Science, 2018-06)
      Three-dimensional topological (crystalline) insulators are materials with an insulating bulk but conducting surface states that are topologically protected by time-reversal (or spatial) symmetries. We extend the notion of ...