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We consider the nonanalytic temperature dependences of the specific heat coefficient, C(T)/T, and spin susceptibility, chi(s)(T), of 2D interacting fermions beyond the weak-coupling limit. We demonstrate within the Luttinger-Ward formalism that the leading temperature dependences of C(T)/T and chi(s)(T) are linear in T, and are described by the Fermi liquid theory. We show that these temperature dependences are universally determined by the states near the Fermi level and, for a generic interaction, are expressed via the spin and charge components of the exact backscattering amplitude of quasiparticles. We compare our theory to recent experiments on monolayers of He3. 相似文献
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We consider spin and electronic properties of itinerant electron systems, described by the spin-fermion model, near the antiferromagnetic critical point. We expand in the inverse number of hot spots in the Brillouin zone, N, and present the results beyond the previously studied N = infinity limit. We found two new effects: (i) Fermi surface becomes nested at hot spots, and (ii) vertex corrections give rise to anomalous spin dynamics and change the dynamical critical exponent from z = 2 to z>2. To first order in 1/N we found z = 2N/(N-2) which for a physical N = 8 yields z approximately 2.67. 相似文献
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G. D. Alkhazov A. E. Barzakh V. P. Denisov V. S. Ivanov I. Y. Chubukov V. N. Fedoseev V. S. Letokhov V. I. Mishin S. K. Sekatsky 《Hyperfine Interactions》1990,61(1-4):1335-1338
New results on spins, electromagnetic moments and isotopic changes of nuclear charge radii for
63
157–159
Eu,
64
146, 148, 150
Cd and
65
147–155, 157, 159
Tb have been obtained from hyperfine structure and isotope shifte measured with laser resonance photoionization technique.
These results complement two-dimensional picture (with respect to H and Z) of the changes of nuclear ground state properties
near the “critical” neutron numbers N=88–90 in the vicinity of the “magric” proten number Z=64. 相似文献