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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Statistical Physics

Background:

  • Quantum Ising models are fundamental for understanding magnetism and quantum phase transitions.
  • Lower-dimensional defects can significantly alter the properties of quantum systems.
  • Understanding scaling phenomena is crucial for characterizing critical behavior.

Purpose of the Study:

  • To investigate quantum scaling phenomena induced by defects in quantum Ising-like models.
  • To analyze the transition between magnetic and kink phases driven by a bond defect.
  • To characterize the universal scaling behavior near the quantum transition.

Main Methods:

  • Analytical and numerical computations of scaling functions.
  • Calculation of low-level energy differences.
  • Analysis of the two-point correlation function.

Main Results:

  • A quantum transition driven by a bond defect in the ordered phase of quantum Ising rings.
  • Identification of a magnet phase with exponential gap decrease and a kink phase with power-law gap decrease.
  • Observation of universal scaling behavior near the transition point.

Conclusions:

  • Defects can induce novel quantum phase transitions and distinct scaling behaviors.
  • The findings have implications for the nonequilibrium dynamics of quantum systems across first-order quantum transitions.