Download Electron-Electron Correlation Effects in Low-Dimensional by Alexandr A. Ovchinnikov, Ivan I. Ukrainskii PDF

By Alexandr A. Ovchinnikov, Ivan I. Ukrainskii

Advances within the physics and chemistry of low-dimensional platforms were relatively tremendous within the previous few a long time. hundreds and hundreds of quasi-one-dimensional and quasi-two-dimensional platforms were synthesized and studied. the preferred representatives of quasi-one-dimensional fabrics are polyacethylenes CH [1] and accomplishing donor-acceptor molecular crystals TIF­ z TCNQ. Examples of quasi-two-dimensional structures are extreme temperature su­ perconductors (HTSC) in keeping with copper oxides LA2CU04, YBa2Cu306+y and natural superconductors in accordance with BEDT -TIP molecules. The homes of such one- and two-dimensional fabrics aren't but totally understood. at the one hand, the equations of movement of one-dimensional sys­ tems are fairly basic, which allows rigorous ideas of version difficulties. however, manifestations of assorted interactions in one-dimensional structures are really strange. This refers, specifically, to electron--electron and electron-phonon interactions. Even in the restrict of a susceptible coupling con­ stant electron--electron correlations produce an power hole within the spectrum of one-dimensional metals implying a Mott transition from steel to semiconductor country. In these kind of circumstances perturbation thought is inapplicable. that's one of many major problems at the manner in the direction of a complete concept of quasi-one-dimensional structures. - This assembly held on the Institute for Theoretical Physics in Kiev may well 15-18 1990 was once dedicated to comparable difficulties. The papers chosen for this quantity are grouped into 3 sections.

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If the kink-holes are present in the system, the optical excitation may cause the electron transition from the valence band to the kink level. e. its energy would be approximately two times lower than the gap LlEg (6). The kinks in a two-dimensional system experience a confinement [3-5], resulting in kink-antikink (KA) pairs with a charge of 2e. These KA pairs form a narrow conduction band of t 2 /U in width. The radius of KA pair at U > t is of the order 7ra(U/t)I/3. Charged kink disturbs the valence of Cu and 0 and consequently it will be followed by a local deformation of Cu-O bonds and charged in Cuo vibration frequencies.

At the same time a slight amount of KA pairs with the charge 2e can be produced. 4. Direct Experimental Evidence of Kink Existence The most reliable data confirming the existence of non-linear excitations (kinks) in conducting organic polymers were obtained by the method of photo-induced absorption (PIA). This method was used for detection of kinks in polyacetylene (for example, [7] and references therein). This method, practically unmodified, was used in several laboratories to investigate Y Ba2Cu307-y [11, 13, 15], La2Cu04-y [12], Ti2Ba2Ca1-xCuOs [14].

Lett. Z. J. Wedd, M. : Phys. Rev. Lett. W. 1. Ukrainskii: Fizika nizkikh temperatur 19883 (1987) [SOy. J. Low Temp. Phys. 1. Ukrainskii: Teor. Mat. Fizika 32 392 (1977) [SOy. 1. Ukrainskii: Zh. eksp. teor. fisika 76 760 (1979) [SOy. 1. Ukrainskii: Phys. Stat. A. 1. F. Kventsel: Usp. fiz. nauk 108 81 (1973) [SOy. Phys. Usp. 15 575 (1973)] D. K. C. M. R. E. King: J. Phys. Rev. Lett. 1. K. 1. Pokhodnia Institute for Theoretical Physics, Metrologicheskaya 14 252130 Kiev, USSR 1. Introduction Much interest has been generated in studying the electronic structure and physical properties of cuprate oxides-high-Tc superconductors (HTS) of LaCu-O and Y-Ba-Cu-O types [1, 2].

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