Parallelized traveling cluster approximation to study numerically spin-fermion models on large lattices
نویسندگان
چکیده
منابع مشابه
Parallelized traveling cluster approximation to study numerically spin-fermion models on large lattices.
Lattice spin-fermion models are important to study correlated systems where quantum dynamics allows for a separation between slow and fast degrees of freedom. The fast degrees of freedom are treated quantum mechanically while the slow variables, generically referred to as the "spins," are treated classically. At present, exact diagonalization coupled with classical Monte Carlo (ED + MC) is exte...
متن کاملLoop algorithms for quantum simulations of fermion models on lattices.
Two cluster algorithms, based on constructing and flipping loops, are presented for worldline quantum Monte Carlo simulations of fermions and are tested on the one-dimensional repulsive Hubbard model. We call these algorithms the loop-flip and loop-exchange algorithms. For these two algorithms and the standard worldline algorithm, we calculated the autocorrelation times for various physical qua...
متن کاملCluster–Exact Approximation of Spin Glass Groundstates
We present an algorithm which calculates groundstates of Ising spin glasses approximately. It works by randomly selecting clusters of spins which exhibit no frustrations. The spins which were not selected, contribute to the local fields of the selected spins. For the spin–cluster a groundstate is exactly calaculated by using graphtheoretical methods. The other spins remain unchanged. This proce...
متن کاملMulticritical points for spin-glass models on hierarchical lattices.
The locations of multicritical points on many hierarchical lattices are numerically investigated by the renormalization group analysis. The results are compared with an analytical conjecture derived by using the duality, the gauge symmetry, and the replica method. We find that the conjecture does not give the exact answer but leads to locations slightly away from the numerically reliable data. ...
متن کاملCluster Simulations of Loop Models on Planar Lattices
Making use of the duality relation of the Ising model, we develop cluster algorithms for several loop models on planar lattices. We then investigate the O(n) model on the honeycomb lattice and faceand corner-cubic models on the square lattice. Several new physical phenomena are observed. For instance, critical exponents, which have not been reported for the O(n) model in literature, are determi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physical Review E
سال: 2015
ISSN: 1539-3755,1550-2376
DOI: 10.1103/physreve.91.063303