Spin-Chirality Duality in a Spin Ladder with Four-Spin Cyclic Exchange

Magnetic Phase Diagram of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange

We study the spin-1/2 two-leg Heisenberg ladder with four-spin ring exchanges under a magnetic field. We introduce an exact duality transformation which is an extension of the spin-chirality duality developed previously and yields a new self-dual surface in the parameter space. We then determine the magnetic phase diagram using the numerical approaches of the density-matrix renormalization-grou...

Quantum phase transition by cyclic four - spin exchange interaction for S = 1 / 2 two - leg spin ladder Yasushi Honda and Tsuyoshi Horiguchi

We investigate an S = 1/2 two-leg spin ladder with a cyclic four-spin exchange interaction whose interaction constant is denoted by J4, by using the density matrix renormalization group method. The interchain and the intrachain interaction constant are denoted by Jrung and Jleg, respectively and assumed to be antiferromagnetic. It turns out that a spin gap between the singlet (S tot = 0) and th...

شار روی ساختار (spin(7

این پایان نامه شامل چهر فصل می باشد که در فصل اول به بیان تعاریف و مفاهیمی خواهیم پرداخت که در طول این پژوهش مورد نیاز است.در فصل دوم به بررسی خمینه هایی با ساختار (spin(7 خوهیم پرداخت.در فصل سوم به بررسی تجزیه فضای فرم ها خواهیم پرداخت، و در فصل چهارم با استفاده از مشتق گیری معادلات، شار عمومی روی ساختار (spin(7 را بدست خواهیم آورد.

Spin-ladder iron oxide: Sr3Fe2O5.

Superconductivity in a spin-ladder cuprate.

Schön et al. (1) claimed to have shown that a two-dimensional structure is not needed to support cuprate superconductivity. Based on the references for the structure of the film provided in their article, however, we believe that this conclusion is premature. In their report on the field-effect-induced modulation of transport properties in thin films of the spin-ladder compound [CaCu2O3]4, Schö...