@article{ISI:000244532600010,
 abstract = {In conformal field theory, key properties of spin-1/2 chains, such as
the ground state energy per site and the excitation gap, scale with
dimerization delta as delta(alpha) with known exponents alpha and
logarithmic corrections. The logarithmic corrections vanish in a spin
chain with nearest (J=1) and next-nearest-neighbor interactions (J(2)),
for J(2c)=0.2411. Density-matrix renormalization group analysis of a
frustrated spin chain with no logarithmic corrections yields the field
theoretic values of alpha, and the scaling relation is valid up to the
physically realized range, delta similar to 0.1. However, chains with
logarithmic corrections (J(2)< 0.2411 J) are more accurately fit by
simple power laws with different exponents for physically realized
dimerizations. We show the exponents decreasing from approximately 3/4
to 2/3 for the spin gap and from approximately 3/2 to 4/3 for the energy
per site, and error bars in the exponent also decrease as J(2)
approaches to J(2c).},
 article-number = {052404},
 author = {Kumar, Manoranjan and Ramasesha, S. and Sen, Diptiman and Soos, Z. G.},
 doi = {10.1103/PhysRevB.75.052404},
 issn = {1098-0121},
 journal = {PHYSICAL REVIEW B},
 month = {FEB},
 number = {5},
 orcid-numbers = {/0000-0002-7624-8155},
 times-cited = {16},
 title = {Scaling exponents in spin-1/2 Heisenberg chains with dimerization and
frustration studied with the density-matrix renormalization group},
 unique-id = {ISI:000244532600010},
 volume = {75},
 year = {2007}
}