Abstract
We study the ground-state magnetism of the half-filled Hubbard model on the anisotropic triangular lattice, where two out of three bonds have hopping t and the third one has t′ in a unit triangle. Working in a spin-rotating frame and using the density matrix renormalization group method as an impurity solver, we provide a proper description of incommensurate magnetizations at zero temperature in the framework of the dynamical mean-field theory (DMFT). It is shown that the incommensurate spiral magnetic order for t′/t0.7 survives the dynamical fluctuations of itinerant electrons in the Hubbard interaction range from the strong-coupling (localized-spin) limit down to the insulator-to-metal transition. We also find that when the anisotropy parameter t′/t increases from the Néel-to-spiral transition, the magnitude of the magnetic moment exhibits a maximum at the isotropic triangular lattice point t′/t=1 and then rapidly decreases in the range of larger t′/t. This work gives a solid foundation for further extension of the study including nonlocal correlation effects neglected at the standard DMFT level.
| Original language | English |
|---|---|
| Article number | 245145 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 94 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - 2016 Dec 28 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Incommensurate spiral magnetic order on anisotropic triangular lattice : Dynamical mean-field study in a spin-rotating frame. / Goto, Shimpei; Kurihara, Susumu; Yamamoto, Daisuke.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 94, No. 24, 245145, 28.12.2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Incommensurate spiral magnetic order on anisotropic triangular lattice
T2 - Dynamical mean-field study in a spin-rotating frame
AU - Goto, Shimpei
AU - Kurihara, Susumu
AU - Yamamoto, Daisuke
PY - 2016/12/28
Y1 - 2016/12/28
N2 - We study the ground-state magnetism of the half-filled Hubbard model on the anisotropic triangular lattice, where two out of three bonds have hopping t and the third one has t′ in a unit triangle. Working in a spin-rotating frame and using the density matrix renormalization group method as an impurity solver, we provide a proper description of incommensurate magnetizations at zero temperature in the framework of the dynamical mean-field theory (DMFT). It is shown that the incommensurate spiral magnetic order for t′/t0.7 survives the dynamical fluctuations of itinerant electrons in the Hubbard interaction range from the strong-coupling (localized-spin) limit down to the insulator-to-metal transition. We also find that when the anisotropy parameter t′/t increases from the Néel-to-spiral transition, the magnitude of the magnetic moment exhibits a maximum at the isotropic triangular lattice point t′/t=1 and then rapidly decreases in the range of larger t′/t. This work gives a solid foundation for further extension of the study including nonlocal correlation effects neglected at the standard DMFT level.
AB - We study the ground-state magnetism of the half-filled Hubbard model on the anisotropic triangular lattice, where two out of three bonds have hopping t and the third one has t′ in a unit triangle. Working in a spin-rotating frame and using the density matrix renormalization group method as an impurity solver, we provide a proper description of incommensurate magnetizations at zero temperature in the framework of the dynamical mean-field theory (DMFT). It is shown that the incommensurate spiral magnetic order for t′/t0.7 survives the dynamical fluctuations of itinerant electrons in the Hubbard interaction range from the strong-coupling (localized-spin) limit down to the insulator-to-metal transition. We also find that when the anisotropy parameter t′/t increases from the Néel-to-spiral transition, the magnitude of the magnetic moment exhibits a maximum at the isotropic triangular lattice point t′/t=1 and then rapidly decreases in the range of larger t′/t. This work gives a solid foundation for further extension of the study including nonlocal correlation effects neglected at the standard DMFT level.
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U2 - 10.1103/PhysRevB.94.245145
DO - 10.1103/PhysRevB.94.245145
M3 - Article
VL - 94
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 24
M1 - 245145
ER -