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Two-dimensional fluids under triangle-well-like interactions: A tunable phase behavior.

A de J Ríos-Roldán1, Víctor M Trejos2, Marco A Chávez-Rojo3

  • 1Departamento de Física, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, 09340 Ciudad de México, Mexico.

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This summary is machine-generated.

Subtle changes in particle interaction potentials significantly alter two-dimensional (2D) fluid phase behavior and structural organization. This study reveals how different potential shapes lead to unique phase transitions and polymorphism in 2D systems.

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Area of Science:

  • Condensed Matter Physics
  • Statistical Mechanics
  • Computational Physics

Background:

  • Understanding phase transitions in two-dimensional (2D) systems is crucial for materials science and statistical physics.
  • Discrete pair potentials offer a tunable platform to explore complex phase behavior and polymorphism.

Purpose of the Study:

  • To investigate the influence of triangular-like pair potential shapes on the phase behavior of 2D fluids.
  • To explore structural organization, phase transitions, and polymorphism in systems with triangular well (TW), Jagla-like (JL), and inverse triangular well (ITW) potentials.

Main Methods:

  • Detailed molecular dynamics simulations were employed.
  • Analysis included thermodynamic properties, radial distribution functions, and bond-orientational order parameters.
  • Correlation functions were used to identify specific phases, including the hexatic phase.

Main Results:

  • The TW potential showed classical 2D features like vapor-liquid coexistence and triangular solids.
  • The JL potential induced structural frustration, stabilizing square lattices and leading to solid-solid coexistence.
  • The ITW potential exhibited complex structural diversity, including dodecagonal and honeycomb-like solids.
  • The hexatic phase was confirmed in the TW potential system.

Conclusions:

  • The shape of the interaction potential critically governs order, polymorphism, and phase stability in 2D systems.
  • Distinct potentials lead to unique phase behaviors, from classical transitions to complex polymorphism.
  • This work provides a framework for identifying the hexatic phase and understanding two-step melting in various 2D models.