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- W2802080676 abstract "We study the zero-temperature phase diagram of transverse field Ising model on the J1 − J2 square lattice. In zero magnetic field, the model has a classical Néel phase for J2/J1 < 0.5 and an antiferromagnetic collinear phase for J2/J1 > 0.5. We incorporate harmonic fluctuations by using linear spin wave theory (LSWT) with single spin flip excitations above a magnetic order background and obtain the phase diagram of the model in this approximation. We find that harmonic quantum fluctuations of LSWT fail to lift the large degeneracy at J2/J1 = 0.5 and exhibit some inconsistent regions on the phase diagram. However, we show that anharmonic fluctuations of cluster operator approach (COA) resolve the inconsistency of the LSWT, which reveals a string-valence bond solid ordered phase for the highly frustrated region." @default.
- W2802080676 created "2018-05-17" @default.
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- W2802080676 date "2018-03-01" @default.
- W2802080676 modified "2023-09-25" @default.
- W2802080676 title "Phase diagram of the frustrated <i>J</i> <sub>1</sub> <i>−</i> <i>J</i> <sub>2</sub> transverse field Ising model on the square lattice" @default.
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- W2802080676 doi "https://doi.org/10.1088/1742-6596/969/1/012114" @default.
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