Bell-CHSH function approach to quantum phase transitions in matrix product systems

Quantum phase transitions in matrix product systems.

We investigate quantum phase transitions (QPTs) in spin chain systems characterized by local Hamiltonians with matrix product ground states. We show how to theoretically engineer such QPT points between states with predetermined properties. While some of the characteristics of these transitions are familiar, like the appearance of singularities in the thermodynamic limit, diverging correlation ...

Quantum Phase Transitions and Matrix Product States in Spin Ladders

X iv :q ua nt -p h/ 06 12 20 7v 1 2 5 D ec 2 00 6 Quantum Phase Transitions and Matrix Product States in Spin Ladders M. Asoudeh,∗ V. Karimipour†,‡ and A. Sadrolashrafi§ Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran (Dated: December 28, 2006) Abstract We investigate quantum phase transitions in ladders of spin 1/2 particles by engineering suitable mat...

Quantum information approach to quantum phase transitions

Quantum phase transitions of a many-body system at zero temperature are characterized by the change of the ground state properties as model parameter g in the system Hamiltonian H(g) is varied across the transition point. People think that structures of the ground-state wavefunction become qualitatively different across the transition point. That is, if we calculate the fidelity, a concept emer...

Quantum Phase Transitions in Random Systems

Quantum Phase Transitions in Magnetic Systems

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