Structure of continuous matrix product operator for transverse field Ising model: An analytic and numerical study |
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Affiliation: | 1.Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;4.Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract: | We study the structure of the continuous matrix product operator (cMPO)[1] for the transverse field Ising model (TFIM). We prove TFIM's cMPO is solvable and has the form $T=rm{e}^{-frac{1}{2}hat{H}_{rm F}}$. $hat{H}_{rm F}$ is a non-local free fermionic Hamiltonian on a ring with circumference $beta$, whose ground state is gapped and non-degenerate even at the critical point. The full spectrum of $hat{H}_{rm F}$ is determined analytically. At the critical point, our results verify the state-operator-correspondence[2] in the conformal field theory (CFT). We also design a numerical algorithm based on Bloch state ansatz to calculate the low-lying excited states of general (Hermitian) cMPO. Our numerical calculations coincide with the analytic results of TFIM. In the end, we give a short discussion about the entanglement entropy of cMPO's ground state. |
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Keywords: | continuous matrix product operator transverse field Ising model state-operator-correspondence |
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