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71.
Optical absorption spectra of radical anion C60- after light alkali-dopping have been studied by using an extended Hubbard model and two distinct induced spectra have been obtained. The result is in agreement with the experimental one. The spectra have been assinged theoretically and the reason for the induced spectra generation has been discussed. 相似文献
72.
The integrability of the one-dimensional chiral Hubbard model is discussed in the limit of strong interaction,U=. The system is shown to be integrable in the sense of the existence of an infinite number of constants of motion. The system is related to a chiral Kondo lattice model at strong interactionJ=+. 相似文献
73.
Joel Feldman Manfred Salmhofer Eugene Trubowitz 《Journal of statistical physics》1996,84(5-6):1209-1336
The perturbation expansion for a general class of many-fermion systems with a nonnested, nonspherical Fermi surface is renormalized to all orders. In the limit as the infrared cutoff is removed, the counterterms converge to a finite limit which is differentiable in the band structure. The map from the renormalized to the bare band structure is shown to be locally injective. A new classification of graphs as overlapping or nonoverlapping is given, and improved power counting bounds are derived from it. They imply that the only subgraphs that can generater factorials in ther th order of the renormalized perturbation series are indeed the ladder graphs and thus give a precise sense to the statement that ladders are the most divergent diagrams. Our results apply directly to the Hubbard model at any filling except for half-filling. The half-filled Hubbard model is treated in another place.This paper is dedicated to the memory of Ansgar Schnizer. 相似文献
74.
The combination of strong correlation and emergent lattice can be achieved when quantum gases are confined in a superradiant Fabry–Perot cavity. In addition to the discoveries of exotic phases, such as density wave ordered Mott insulator and superfluid, a surprising kink structure is found in the slope of the cavity strength as a function of the pumping strength. In this article, we show that the appearance of such a kink is a manifestation of a liquid–vapour-like transition between two superfluids with different densities. The slopes in the immediate neighborhood of the kink become divergent at the liquid–vapour critical points and display a critical scaling law with a critical exponent 1 in the quantum critical region. 相似文献
75.
C. Dziurzik G. I. Japaridze A. Schadschneider I. Titvinidze J. Zittartz 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,51(1):41-51
In this paper we study the ground state phase diagram of a
one-dimensional t-J-U model away from half-filling. In the large-bandwidth
limit and for ferromagnetic exchange with easy-plane anisotropy a phase
with gapless charge and massive spin excitations, characterized by the
coexistence of triplet superconducting and spin density wave
instabilities is realized in the ground state.
With increasing ferromagnetic exchange transitions into a ferrometallic
and then a spin gapped triplet superconducting phase take place. 相似文献
76.
A fundamental theme in holomorphic dynamics is that the local geometry of parameter space (e.g. the Mandelbrot set) near a parameter reflects the geometry of the Julia set, hence ultimately the dynamical properties, of the corresponding dynamical system. We establish a new instance of this phenomenon in terms of entropy. 相似文献
77.
78.
79.
80.
Yu. Kh. Eshkabilov 《Theoretical and Mathematical Physics》2006,149(2):1497-1511
In the space L 2(T ν ×T ν ), where T ν is a ν-dimensional torus, we study the spectral properties of the “three-particle” discrete Schrödinger operator ? = H0 + H1 + H2, where H0 is the operator of multiplication by a function and H1 and H2 are partial integral operators. We prove several theorems concerning the essential spectrum of ?. We study the discrete and essential spectra of the Hamiltonians Ht and h arising in the Hubbard model on the three-dimensional lattice. 相似文献