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Journal Article

Incommensurate and superconducting phases in an exactly solvable model


Karnaukhov,  I. N.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Karnaukhov, I. N. (2002). Incommensurate and superconducting phases in an exactly solvable model. Physical Review B, 66(9): 092304. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000066000009092304000001&idtype=cvips&gifs=yes.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-36FB-1
An integrable lattice model of strongly interacted electrons with nearest-neighbor and next-nearest-neighbor hoppings is proposed and investigated. The exact ground-state phase diagram is calculated as a function of an on-site interaction, a value of the hopping integral between next-nearest-neighbor lattice sites and a band filling (the nearest-neighbor hopping integral is chosen equal to unity). The model describes incommensurate and superconducting phases which are realized simultaneously in a definite region of interaction parameters and a band filling. The long-distance asymptotics of the density-density and one- particle correlation functions are calculated in the incommensurate phase.