Fermions under strong repulsion: from multiconnected Fermi surfaces to Fermi condensation
| dc.creator | Pogorelov, Yu. G. | |
| dc.creator | Shaginyan, V. R. | |
| dc.date | 2002-10-04 | |
| dc.date.accessioned | 2026-07-07T02:47:36Z | |
| dc.date.available | 2026-07-07T02:47:36Z | |
| dc.description | We consider a system of fermions with mass m and model repulsive interaction U(q) = g/\sqrt{q^2 + q_0^2}, where q is the momentum transfer, q_0 the screening constant, and g > 0 the coupling constant. It is shown that at g > g_cr > 3π^2/m the system ground state is changed from fully occupied Fermi sphere to multiconnected Fermi sphere (MFS), consisting in N fully occupied spherical layers (icebergs) separated by empty spacers. An effective description is developed for such states at N >> 1, showing their tendency at N \to \infty to the Fermi condensate (FC) state known for the model U(q) = g/q [Khodel, Shaginyan, JETP Lett., 51, 553, 1990]. At finite temperatures, a crossover is predicted from the Fermi liquid behavior of MFS with effective mass m^* \sim m N/ln(N) to non-Fermi-liquid behavior with m^* \propto 1/T at T > T^* \sim T_F ln(N)/N. | |
| dc.description | 10 pages, 2 figures, to be published in the Proceedings of Workshop on Condensed Matter Theories CMT26, Luso, Portugal, 2002 | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0210109 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0210109 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/20069 | |
| dc.subject | Strongly Correlated Electrons | |
| dc.title | Fermions under strong repulsion: from multiconnected Fermi surfaces to Fermi condensation | |
| dc.type | text |