期刊
JETP LETTERS
卷 102, 期 6, 页码 361-366出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364015180162
关键词
-
资金
- Russian Foundation for Basic Research [13-02-00523, 14-02-31237]
In the framework of the t-J (1)-J (2)-V model, the integral equation determining the order parameter Delta(p) of the superconducting phase is derived for an ensemble of strongly correlated fermions on a triangular lattice using the diagram technique for the Hubbard operators. Taking into account the interaction between the Hubbard fermions within two coordination spheres, we demonstrate that the exact analytical solution Delta 2(p) of this equation for the superconducting phase with the () symmetry can be expressed as a superposition of two chiral basis functions. This gives rise to a new set of nodal points for the complex parameter Delta 2(p). Moreover, at some critical value x (c) of the charge carrier density, we obtain a gapless phase with six Dirac points. The passing of x through x = x (c) is accompanied by the topological quantum transition corresponding to the change in the topological parameter Q.
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