CAS: Physics: Scholarly Papers
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Typicality at quantumcritical points
(IOP PUBLISHING LTD, 20180801)We discuss the concept of typicality of quantum states at quantumcritical points, using projector Monte Carlo simulations of an S = 1/2 bilayer Heisenberg antiferromagnet as an illustration. With the projection (imaginary) ... 
Indicators of conformal field theory: Entanglement entropy and multiplepoint correlators
(American Physical Society, 20170727)The entanglement entropy (EE) of quantum systems is often used as a test of lowenergy descriptions by conformal field theory (CFT). Here we point out that this is not a reliable indicator, as the EE often shows the same ... 
Symmetry enhanced firstorder phase transition in a twodimensional quantum magnet
Theoretical studies of quantum phase transitions have suggested critical points with higher symmetries than those of the underlying Hamiltonian. Here we demonstrate a surprising emergent symmetry of the coexistence state ... 
Numerical investigations of SO(4) emergent extended symmetry in spin1/2 Heisenberg antiferromagnetic chains
(American Physical Society, 20180710)The antiferromagnetic Heisenberg chain is expected to have an extended symmetry, [SU(2)×SU(2)]/Z2, in the infrared limit whose physical interpretation is that the spin and dimer order parameters form the components of a ... 
Insulator to superfluid transition in coupled photonic cavities in two dimensions
(20080623)A system of coupled photonic cavities on a twodimensional square lattice is systematically investigated using the stochastic series expansion quantum Monte Carlo method. The ground state phase diagram contains insulating ... 
Randomsinglet phase in disordered twodimensional quantum magnets
We study effects of disorder (randomness) in a 2D squarelattice S=1/2 quantum spin system, the JQ model with a 6spin interaction Q supplementing the Heisenberg exchange J. In the absence of disorder the system hosts ... 
Dynamical properties of the S=1/2 random Heisenberg chain
(American Physical Society, 20180328)We study dynamical properties at finite temperature (T) of Heisenberg spin chains with random antiferromagnetic exchange couplings, which realize the random singlet phase in the lowenergy limit, using three complementary ... 
Dual time scales in simulated annealing of a twodimensional Ising spin glass
(American Physical Society, 20170522)We apply a generalized KibbleZurek outofequilibrium scaling ansatz to simulated annealing when approaching the spinglass transition at temperature T=0 of the twodimensional Ising model with random J=±1 couplings. ... 
Fielddriven quantum phase transitions in S=1/2 spin chains
(American Physical Society, 20170525)We study the magnetization process of a onedimensional extended Heisenberg model, the J−Q model, as a function of an external magnetic field h. In this model, J represents the traditional antiferromagnetic Heisenberg ... 
Critical level crossings and gapless spin liquid in the squarelattice spin1/2 J1J2 Heisenberg antiferromagnet
(20170227)We use the DMRG method to calculate several energy eigenvalues of the frustrated S = 1 / 2 squarelattice J 1  J 2 Heisenberg model on 2 L × L cylinders with L ≤ 10. We identify ...