"""
Phase ordering evolution visualisation for the 2D XY model.
Quenches from a disordered state to T < T_BKT and records the spin configuration
at multiple time steps, plotting phase configurations, vorticity maps, and
radially averaged correlation functions G(r).
"""
from __future__ import annotations
import argparse
import logging
from models.xy_model import XYSimulation
from utils.evolution_helpers import run_ordering_evolution
from utils.system import parse_args_compat, setup_logging
[docs]
def main() -> None:
"""Run the simulation and generate a multi-row phase ordering figure."""
parser = argparse.ArgumentParser(description='2D XY Model Phase Ordering Visualisation')
parser.add_argument('--size', type=int, default=256, help='Linear lattice size L')
parser.add_argument('--temp', type=float, default=0.5, help='Quench temperature T')
parser.add_argument(
'--targets',
type=int,
nargs='+',
default=[1, 10, 100, 1000],
help='MC steps at which to take snapshots',
)
parser.add_argument('--output-dir', type=str, default='results/xy', help='Output directory')
parser.add_argument('--log-file', type=str, default=None, help='Optional log file path')
parser.add_argument('--verbose', action='store_true', help='Enable verbose logging')
args = parse_args_compat(parser)
log_level = logging.DEBUG if args.verbose else logging.INFO
logger = setup_logging(level=log_level, log_file=args.log_file)
T_BKT: float = 0.893
logger.info(f'XY phase ordering evolution (L={args.size}, T={args.temp})')
logger.info(f'Recording snapshots at steps {sorted(args.targets)} ...')
run_ordering_evolution(
model_cls=XYSimulation,
model_kwargs={},
capture_vorticity=True,
title=(
f'2D XY Model Ordering Evolution - T = {args.temp}'
f' (< T_BKT ≈ {T_BKT}), L = {args.size}'
),
size=args.size,
temp=args.temp,
step_targets=list(args.targets),
output_dir=args.output_dir,
logger=logger,
)
if __name__ == '__main__':
main()