Density-matrix renormalization-group studies of the spin-1/2 Heisenberg system with dimerization and frustration

Chitra, R and Pati, Swapan and Krishnamurthy, HR and Sen, Diptiman and Ramasesha, S (1995) Density-matrix renormalization-group studies of the spin-1/2 Heisenberg system with dimerization and frustration. In: Physical Review B: Condensed Matter, 52 (9). pp. 6581-6587.

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Abstract

Using the density-matrix renormalization-group technique, we study the ground-state phase diagram and other low-energy properties of an isotropic antiferromagnetic spin-1/2 chain with both dimerization and frustration, i.e., an alternation delta of the nearest-neighbor exchanges and a next-nearest-neighbor exchange J(2). For delta = 0, the system is gapless for J(2) < J(2c) and has a gap for J(2) > J(2c) where J(2c) is about 0.241. For J(2) = J(2c) the gap above the ground state grows as delta to the power 0.667 +/- 0.001. In the J(2)-delta plane, there is a disorder line 2J(2) + delta = 1. To the left of this line, the peak in the static structure factor S(q) is at q(max) = pi (Neel phase), while to the right of the line, q(max) decreases from pi to pi/2 as J(2) is increased to large values (spiral phase). For delta = 1, the system is equivalent to two coupled chains as on a ladder and it is gapped for all values of the interchain coupling.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Centre for Theoretical Studies (Ceased to exist at the end of 2003)
Date Deposited:	15 Jun 2011 09:00
Last Modified:	15 Jun 2011 09:00
URI:	http://eprints.iisc.ac.in/id/eprint/37520

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