Fermions with cubic and quartic spectrum
Abstract
We study exotic fermions with spectrum E ^{2} ∝ p ^{2 N }. Such spectrum emerges in the vicinity of the Fermi point with multiple topological charge N, if special symmetry is obeyed. When this symmetry is violated, the multiple Fermi point typically splits into N elementary Fermi points, i.e., Dirac points with N = 1 and spectrum E ^{2} ∝ p ^{2}.
 Publication:

Soviet Journal of Experimental and Theoretical Physics Letters
 Pub Date:
 November 2010
 DOI:
 10.1134/S0021364010220091
 arXiv:
 arXiv:1010.0393
 Bibcode:
 2010JETPL..92..681H
 Keywords:

 Condensed Matter  Strongly Correlated Electrons;
 High Energy Physics  Phenomenology
 EPrint:
 6 pages, 6 figures, JETP Letters style, version submitted to JETP Letters, references added