Boundary susceptibility in the spin-1/2 chain: Curie like behavior without magnetic impurities

Details Boundary susceptibility in the spin-1/2 chain: Curie like behavior without magnetic impurities Boundary susceptibility in the spin-1/2 chain: Curie like behavior without magnetic impurities

2003-10-10

arxiv.org/abs/cond-mat/0310230v4

Phys. Rev. Lett. 92, 037206 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure, final version

Scientific paper

10.1103/PhysRevLett.92.037206

We investigate the low-temperature thermodynamics of the spin-1/2 Heisenberg chain with open ends. On the basis of boundary conformal field theory arguments and numerical density matrix renormalization group calculations, it is established that in the isotropic case the impurity susceptibility exhibits a Curie-like divergent behavior as the temperature decreases, even in the absence of magnetic impurities. A similar singular temperature dependence is also found in the boundary contributions of the specific heat coefficient. In the anisotropic case, for $1/2<\Delta<1$, these boundary quantities still show singular temperature dependence obeying a power law with an anomalous dimension. Experimental consequences will be discussed.

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