Abstract
We study quantum phase transitions by measuring the bond energy, the number density, and the half-chain entanglement entropy in the one-dimensional ionic Hubbard model. By using the matrix product operator to perform the infinite density matrix renormalization group, we obtain the ground states in the canonical form of matrix product states. Depending on the chemical potential and the staggered potential, the number density and the half-chain entanglement entropy shows clear signatures of a Mott transition. Our results confirm the success of using the matrix product operator method to investigate itinerant fermion systems.
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