Neutral Fermi surfaces in Mixed Valent Kondo Insulators: Majorana Hubbard Operators
ORAL
Abstract
The development of slave particle approaches provides a way to explore different patterns of operator fractionalization in strongly correlated systems. The recent observation of quantum oscillations in mixed valent SmB2 has raised the possibility of neutral Fermi surfaces in this material[1-4]. This motivates a search for a representation of the Hubbard operator in terms of Majorana, rather than Dirac fermions. In this talk I will describe how this can be achieved and using the method, discuss the prospects for a two-phase description of SmB6, in terms of a competition between a fully gapped strong topological insulator and a strange dielectric.
[1] P. Coleman, E. Miranda, and A. Tsvelik, Physica B: Condensed Matter 186-188, 362 (1993).
[2] G. Baskaran, ArXiv arXiv:1507.03477.
[3] Onur Erten, Po-Yao Chang, Piers Coleman, Alexei M. Tsvelik, Phys. Rev. Lett., 119, 057603 (2017).
[4] Debanjan Chowdhury, Inti Sodemann and T. Senthil, Nature Communications, 9, 1766 (2018).
[1] P. Coleman, E. Miranda, and A. Tsvelik, Physica B: Condensed Matter 186-188, 362 (1993).
[2] G. Baskaran, ArXiv arXiv:1507.03477.
[3] Onur Erten, Po-Yao Chang, Piers Coleman, Alexei M. Tsvelik, Phys. Rev. Lett., 119, 057603 (2017).
[4] Debanjan Chowdhury, Inti Sodemann and T. Senthil, Nature Communications, 9, 1766 (2018).
–
Presenters
-
Piers Coleman
Physics and Astronomy, Rutgers, The State University of New Jersey, Center for Materials Theory, Rutgers University, Rutgers University, New Brunswick, Rutgers University, Piscataway NJ
Authors
-
Piers Coleman
Physics and Astronomy, Rutgers, The State University of New Jersey, Center for Materials Theory, Rutgers University, Rutgers University, New Brunswick, Rutgers University, Piscataway NJ