Wednesday, February 1, 2012

1201.6456 (C. C. N. Kuhn et al.)

Universality class of quantum criticality for strongly repulsive spin-1
bosons with antiferromagnetic spin-exchange interaction

C. C. N. Kuhn, X. W. Guan, A. Foerster, M. T. Batchelor
Using the thermodynamic Bethe ansatz equations we study the quantum phase
diagram, thermodynamics and criticality of one-dimensional spin-1 bosons with
strongly repulsive density-density and antiferromagnetic spin-exchange
interactions. We analytically derive a high precision equation of state from
which the Tomonaga-Luttinger liquid physics and quantum critical behavior of
the system are computed. We obtain explicit forms for the scaling functions
near the critical points yielding the dynamical exponent $z=2$ and correlation
length exponent $\nu=1/2$ for the quantum phase transitions driven by either
the chemical potential or the magnetic field. Consequently, we further
demonstrate that quantum criticality of the system can be mapped out from the
finite temperature density and magnetization profiles of the 1D trapped gas.
Our results provide the physical origin of quantum criticality in a 1D
many-body system beyond the Tomonaga-Luttinger liquid description.
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