CROSSOVER BETWEEN THE HALDANE-GAP PHASE AND THE DIMER PHASE IN THE SPIN-1/2 ALTERNATING HEISENBERG CHAIN
スポンサーリンク
概要
- 論文の詳細を見る
The ground-state properties of the spin-1/2 Heisenberg chain, which has two exchange couplings (J > J') alternatingly, are studied. This model interpolates the spin-1 antiferromagnetic Heisenberg chain (AFHC) (J' --> - infinity, J > 0), the dimerized spin-1/2 AFHC (J' congruent-to J > 0), and the uniform spin-1/2 AFHC (J' = J > 0) continuously. The string order introduced by den Nijs-Rommelse and Tasaki changes continuously through the Haldane phase and the dimer phase to vanish at J = J'. It is at a maximum for J' = 0. This implies that the string order is related to the local singlet correlation in terms of the spin-1/2 model. The lowest excitation can be regarded as the renormalized triplet wave. The reversal of the anisotropy effect on the excitation spectrum of the spin-1 AFHC is also explained in a intuitive way based on this picture.
論文 | ランダム
- 蛍光滴定法による抗糖尿病薬troglitazoneの立体異性体のタンパク結合の測定
- 鉛直管内上昇気液二相流における液膜厚さに与える円筒形障害物長さの影響(流体工学,流体機械)
- 気功法の生理・心理学的研究
- Expression of the p38 MAPK, NF-κB and cyclin D1 in extramammary Paget's disease
- B-12 プラバスタチンの腸肝循環