2,265 research outputs found
Quantum Monte Carlo study of the transverse-field Ising model on a frustrated checkerboard lattice
We present the numerical results for low temperature behavior of the
transverse-field Ising model on a frustrated checkerboard lattice, with focus
on the effect of both quantum and thermal fluctuations. Applying the
recently-developed continuous-time quantum Monte Carlo algorithm, we compute
the magnetization and susceptibility down to extremely low temperatures while
changing the magnitude of both transverse and longitudinal magnetic fields.
Several characteristic behaviors are observed, which were not inferred from the
previously studied quantum order from disorder at zero temperature, such as a
horizontal-type stripe ordering at a substantial longitudinal field and a
persistent critical behavior down to low temperature in a weak longitudinal
field region.Comment: 6 pages, 5 figures, accepted for publication in J. Phys.: Conf. Se
Pion decay constant in quenched QCD with Kogut-Susskind quarks
We present a non-perturbative calculation for the pion decay constant with
quenched Kogut-Susskind quarks. Numerical simulations are carried out at and 6.2 with various operators extending over all flavors. The
renormalization correction is applied for each flavor by computing
non-perturbative renormalization constants, and it is compared with a
perturbative calculation. We also study the behavior of in the
continuum limits for both non-perturbative and perturbative calculations. The
results in the continuum limit is also discussed.Comment: LATTICE99(matrix elements) 3 pages, 4 eps figure
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