S chain with the Ising bond alternation

清美 岡本, Kiyomi Okamoto

Kiyomi Okamoto, Atsuhiro Kitazawa, 清美 岡本 +1 more

C. Z. Yang, Zhongyang Li, Qing Jiang

KIYOMI OKAMOTO

D V Dmitriev, V Ya Krivnov

The spin-[Formula: see text] delta-chain (sawtooth chain) with antiferromagnetic Heisenberg basal chain and Ising apical-basal interactions is studied. The basal-apical interactions involve the bond alternation. The limiting cases of the model include the symmetrical delta-chain and the antiferromagnetic chain in the staggered magnetic field. We study ground state properties of the model by the exact diagonalization and density matrix renormalization group methods. The ground state phase diagram as a function of the bond alternation consists of magnetic and various non-magnetic phases. All phases excluding the ferrimagnetic phase are gapped and an origin of the gaps is cleared.

Stephen J. Cornell, Michel Droz, Nóra Menyhárd

The domain growth after a quench is controlled by an exponent which generally has very broad universal properties. The authors investigate the alternating bond Ising chain with Glauber dynamics, and find that its growth exponent is universal, even though the dynamical critical exponent z is non-universal. They show that usual scaling theory can be reformulated to account for the above findings.