Abstract
An unconventional type of the Mott’s insulators where the gap in the spectrum of single-particle excitations is associated with repulsive effective interactions between quasiparticles is shown to exist in strongly correlated electron systems of solids that possess flat bands. The occurrence of this gap is demonstrated to be the consequence of violation of particle–hole symmetry, inherent in such systems. The results obtained are applied to elucidate the Fermi arc structure observed at temperatures up to 100 K in angle-resolved photoemission spectra of the compound Sr2IrO4, not showing superconductivity down to low T.
Similar content being viewed by others
References
V. A. Khodel and V. R. Shaginyan, JETP Lett. 51, 553 (1990).
G. E. Volovik, JETP Lett. 53, 222 (1991).
P. Nozièes, J. Phys. I 2, 443 (1992).
S.-S. Lee, Phys. Rev. D 79, 086006 (2009).
D. Yudin, D. Hirshmeier, H. Hafermann, O. Eriksson, A. I. Lichtenstein, and M. I. Katsnelson, Phys. Rev. Lett. 112, 070403 (2014).
V. A. Khodel, V. R. Shaginyan, and P. Schuck, JETP Lett. 63, 752 (1996).
V. A. Khodel, J. W. Clark, and M. V. Zverev, Phys. At. Nucl. 74, 1237 (2011).
V. R. Shaginyan, A. Z. Msezane, K. G. Popov, J. W. Clark, M. V. Zverev, and V. A. Khodel, Phys. Rev. B 86, 085147 (2012).
J. W. Clark, M. V. Zverev, and V. A. Khodel, Ann. Phys. 327, 3063 (2012).
M. Ya. Amusia, K. G. Popov, V. R. Shaginyan, and V. A. Stephanovich, Springer Ser. Solid-State Sci. 182 (2014).
V. A. Khodel, J. W. Clark, V. R. Shaginyan, and M. V. Zverev, JETP Lett. 102, 826 (2015).
V. A. Khodel, J. W. Clark, K. G. Popov, and V. R. Shaginyan, JETP Lett. 101, 413 (2015).
T. T. Heikkila and G. E. Volovik, arXiv:1504.0584.
V. A. Khodel, J. W. Clark, and M. V. Zverev, Phys. Rev. B 78, 075120 (2008).
S. T. Belyaev, Sov. Phys. JETP 7, 289 (1958).
S. T. Belyaev, Sov. Phys. JETP 7, 299 (1958).
V. M. Galitskii, Sov. Phys. JETP 7, 104 (1958).
V. A. Khodel and M. V. Zverev, JETP Lett. 70, 759 (1999).
A. I. Larkin and Yu. N. Ovchinnikov, Sov. Phys. JETP 20, 762 (1964).
P. Fulde and R. A. Ferrell, Phys. Rev. A 135, 550 (1964).
M. V. Zverev, V. A. Khodel, and J. W. Clark, JETP Lett. 74, 46 (2001).
V. A. Khodel, V. V. Khodel, and V. R. Shaginyan, Phys. Rep. 249, 1 (1994).
M. R. Norman, H. Ding, M. Ranteria, J. C. Campuzano, T. Yokoya, T. Takeuchi, T. Takahashi, T. Mochiku, K. Kadowaki, P. Guptasarma, and D. H. Hinks, Nature 392, 157 (1998).
Y. K. Kim, O. Krupin, J. D. Denlinger, A. Bostwick, E. Rotenberg, Q. Zhao, J. F. Mitchell, J. W. Allen, and B. J. Kim, Science 345, 187190 (2014).
A. de la Torre, S. McKeown Walker, F. Y. Bruno, S. Ricco, Z. Wang, I. G. Lizama, G. Scheerer, G. Giriat, D. Jaccard, C. Berthod, T. K. Kim, M. Hoesh, E. C. Hunter, R. S. Perry, A. Tamai, and F. Baumberger, Phys. Rev. Lett. 115, 176402 (2015).
Y. K. Kim, N. H. Sung, J. D. Denlinger, and B. J. Kim, arXiv: 1506.066392.
D. Klochkov, V. Suleimanov, G. Puhlhöfer, D. G. Yakovlev, A. Santangelo, and K. Werner, Astron. Astrophys. 573, A53 (2015).
D. D. Ofengeim, A. D. Kaminker, D. Klochkov, V. Suleimanov, and D. G. Yakovlev, arXiv: 1510.00573.
Author information
Authors and Affiliations
Corresponding author
Additional information
The article is published in the original.
Rights and permissions
About this article
Cite this article
Khodel, V.A. Occurrence of a Mott-like gap in single-particle spectra of electron systems possessing flat bands. Jetp Lett. 103, 702–707 (2016). https://doi.org/10.1134/S0021364016110060
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0021364016110060