The spin- transverse XX chain with regularly alternating bonds and fields
نویسندگان
چکیده
منابع مشابه
Quantum Spin Chains with Regularly Alternating Bonds and Fields
We consider the spin1 2 XY chain in a transverse field with regularly varying exchange interactions and on-site fields. In two limiting cases of the isotropic (XX) and extremely anisotropic (Ising) exchange interaction the thermodynamic quantities are calculated rigorously with the help of continued fractions. We discuss peculiarities of the low-temperature magnetic properties and a possibility...
متن کاملIsing Chain in Regularly Alternating Transverse Field: Spin Correlation Functions
We consider the spin1 2 Ising chain in a regularly alternating transverse field to examine the effects of regular alternation on the quantum phase transition inherent in the quantum Ising chain. The number of quantum phase transition points strongly depends on the specific set of the Hamiltonian parameters but never exceeds 2p where p is the period of alternation. Calculating the spin correlati...
متن کاملtransverse Ising chain with periodically varying bonds and fields
Using continued fractions we study the ground state properties of the spin– 1 2 Ising chain in a transverse field with periodically varying interaction strengths and external fields. We consider in detail the chain having the period of modulation of interactions equals 2 and compare the results obtained with those corresponding to the spin– 1 2 isotropic XY chain in a transverse field. In contr...
متن کامل0 Spin - Peierls instability in the spin - 12 transverse XX chain with Dzyaloshinskii - Moriya interaction
We calculate exactly the density of magnon states of the regularly alternating spin2 XX chain with Dzyaloshinskii-Moriya interaction. The obtained result permit us to examine the stability of the chain with respect to spin-Peierls dimerization. We found that depending on the dependences of Dzyaloshinskii-Moriya interaction on distortion amplitude it may act either in favour of the dimerization ...
متن کاملQuantum Phase Transition in a Transverse Ising Chain with Regularly Varying Parameters * the One-dimensional Spin
Using rigorous analytical analysis and exact numerical data for the spin-1 2 transverse Ising chain we discuss the effects of regular alternation of the Hamiltonian parameters on the quantum phase transition inherent in the model.1 2 Ising model in a transverse field (the transverse Ising chain) defined by the Hamiltonian H = n 2Is x n s x n + n Ωs z n (1) is known to be the simplest system exh...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters A
سال: 1999
ISSN: 0375-9601
DOI: 10.1016/s0375-9601(99)00650-7