Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1134/S0021364015180162

Аннотация: 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.

Журнал: JETP LETTERS

Выпуск журнала: Vol. 102, Is. 6

Номера страниц: 361-366

ISSN журнала: 00213640

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

• Val'kov V.V. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
• Mitskan V.A. (Reshetnev Siberian State Aerospace University)
• Val'kova T.A. (Siberian Federal University)

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