Closing the Gap in Band Theory

Filling-Enforced Gaplessness in Band Structures of the 230 Space Groups
Authors: Haruki Watanabe, Hoi Chun Po, Michael P. Zaletel, and Ashvin Vishwanath
Phys. Rev. Lett. 117, 096404 (2016)

Recommended with a commentary by Liang Fu, Massachusetts Institute of Technology.
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Anomalous assembly of ill-fitting elements

1. Geometric frustration and compatibility conditions for two dimensional director fields
Authors: Idan Niv and Efi Efrati

2. Geometrical frustration yields fibre formation in self-assembly
Authors: Martin Lenz and Thomas A. Witten
Nature Physics (2017) doi:10.1038/nphys4184

Recommended with a commentary by Gregory M. Grason, University of Massachusetts, Amherst.
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Iron-based Superconductivity: Towards Optimizing Tc through Orbital Selectivity

1. Discovery of orbital-selective Cooper pairing in FeSe
Authors: P. O. Sprau, A. Kostin, A. Kreisel, A. E. Böhmer, V. Taufour, P. C. Canfield, S. Mukherjee, P. J. Hirschfeld, B. M. Andersen, J. C. Séamus Davis
Science 357, 75 (2017)

2. Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
Authors: M. D. Watson, S. Backes, A. A. Haghighirad, M. Hoesch, T. K. Kim, A. I. Coldea, and R. Valenti
Phys. Rev. B 95, 081106(R) (2017)

3. Direct observation of dispersive lower Hubbard band in iron-based superconductor FeSe
Authors: D. V. Evtushinsky, M. Aichhorn, Y. Sassa, Z.-H. Liu, J. Maletz, T. Wolf, A. N. Yaresko, S. Biermann, S. V. Borisenko, and B. Büchner

Recommended with a commentary by Qimiao Si, Rice University.
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