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Kosterlitz-Thouless Phase Transition in the 2D XY Model

  • Task ID: physics.kt_phase_transition_2d_xy_model
  • Domain: physics
  • Subdomain: statistical_physics
  • Status: test
  • Tags: statistical_physics, xy_model, kt_transition, bkt_transition, monte_carlo, helicity_modulus, vortex_unbinding, algebraic_correlations, finite_size_scaling, second_moment_correlation_length, magnetic_susceptibility, logarithmic_corrections, weber_minnhagen, lmin_sweep, uncertainty_estimation, infinite_generation

Public Summary

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Example B1 Prompt Excerpt

You are given a finite-size Monte Carlo study of the square-lattice 2D XY model near its Kosterlitz-Thouless transition.
Research goal:
- Simulate the periodic 2D XY model on the provided lattice sizes and temperature grid.
- Identify the KT transition through the helicity modulus, vortex proliferation, algebraic spin-spin correlations, a second-moment correlation-length ratio, a susceptibility logarithmic-correction route, and a Weber-Minnhagen finite-size analysis.
- Produce the required code, numerical outputs, and overview figure.
Input files:
- `data/control_primary.json`: anonymous scan manifest. `axis_bundle.axis_a` is the temperature grid, `axis_bundle.axis_b` is the lattice-size grid, `axis_bundle.probe` is the radial-distance grid for the largest system, `state_bundle.file` points to the initial-angle bank, `focus_probe_rows` selects the temperatures used for the largest-lattice radial bundle, `fit_window_probe` is the radial fitting window for `eta(T)`, and `stage_plan` stores the hybrid Monte Carlo schedule.
- `data/scan_axis_a.npy`: the temperature grid. In this instance it is `{{temperature_grid}}`.

Notes

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