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The quantum phase transition between topological and non-topological insulators or between fully gapped superfluids/superconductors can occur without closing the gap.
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S. Murakawa, Y. Tamura, Y. Wada, M. Wasai, M. Saitoh, Y. Aoki, R. Nomura, Y. Okuda, Y. Nagato, M. Yamamoto, S. Higashitani and K. Nagai, New anomaly in transverse acoustic impedance of superfluid 3 He-B with a wall coated by several layers of 4 He, Phys. Rev. Lett. 103
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2009
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G.E. Volovik, Fermion zero modes at the boundary of superfluid 3 He-B, Pis’ma ZhETF 90
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Xiao-Liang Qi and Shou-Cheng Zhang, Topological insulators and superconductors, Rev. Mod. Phys. 83
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L. Fidkowski and A. Kitaev, Effects of interactions on the topological classification of free fermion systems. Phys. Rev. B 81
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V. Gurarie, Single-particle GreenÕs functions and interacting topological insulators, Phys. Rev. B 83
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A.M. Essin and V. Gurarie, Bulk-boundary correspondence of topological insulators from their respective GreenÕs functions, Phys. Rev. B 84
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Y. Tsutsumi, M. Ichioka and K. Machida, Majorana surface states of superfluid 3 He A and B phases in a slab, Phys. Rev. B 83
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Y. Nagato, S. Higashitani and K. Nagai, Strong anisotropy in spin suceptibility of superfluid He-3-B film caused by surface bound states, J. Phys. Soc. Japan 78
2009
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2009
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M.Z. Hasan and C.L. Kane, Topological Insulators, Rev. Mod. Phys. 82
2010
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Y. Nishida, Is a color superconductor topological? Phys. Rev. D 81
2010
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2010
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J.C.Y. Teo and C.L. Kane, Topological defects and gapless modes in insulators and superconductors, Phys. Rev. B 82
2010
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Chi-Ken Lu and I.F. Herbut, Pairing symmetry and vortex zero-mode for superconducting Dirac fermions, Phys. Rev. B 82
2010
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2011
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2011
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T.T. Heikkilä, N.B. Kopnin and G.E. Volovik, Flat bands in topological media, Pis’ma ZhETF 94
2011
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Xiangang Wan, A.M. Turner, A. Vishwanath and S.Y. Savrasov, Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates, Phys. Rev. B 83
2011
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A.A. Burkov and L. Balents, Weyl semimetal in a topological insulator multilayer, Phys. Rev. Lett. 107
2011
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