Abstract
The ground-state phase diagram is numerically studied for an electronic model consisting of the spin exchange term (J) and the correlated hopping term (t3: the three-site term). This model has no single-particle hopping and the ratio of the two terms is controlled by a parameter α≡4t3/J. The case of α=1 corresponds to complete suppression of single-particle hopping in the strong-coupling limit of the Hubbard model. In one dimension, phase separation takes place below a critical value αc = 0.36-0.63 which depends on the electron density. Spin gap opens in the whole region except the phase-separated one. For α ≳ 1.2 and low hole densities, charge-density-wave correlations are the most dominant, whereas singlet-pairing correlations are the most dominant in the remaining region. The possibility of superconductivity in the two-dimensional case is also discussed, based on equal-time pairing correlations.
| Original language | English |
|---|---|
| Pages (from-to) | 1531-1535 |
| Number of pages | 5 |
| Journal | Journal of Physics and Chemistry of Solids |
| Volume | 63 |
| Issue number | 6-8 |
| DOIs | |
| Publication status | Published - 2002 Jan 1 |
| Externally published | Yes |
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Keywords
- A. Superconductors
- D. Phase transitions
- D. Superconductivity
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
Cite this
Competition between spin exchange and correlated hopping. / Saiga, Y.; Imada, Masatoshi.
In: Journal of Physics and Chemistry of Solids, Vol. 63, No. 6-8, 01.01.2002, p. 1531-1535.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Competition between spin exchange and correlated hopping
AU - Saiga, Y.
AU - Imada, Masatoshi
PY - 2002/1/1
Y1 - 2002/1/1
N2 - The ground-state phase diagram is numerically studied for an electronic model consisting of the spin exchange term (J) and the correlated hopping term (t3: the three-site term). This model has no single-particle hopping and the ratio of the two terms is controlled by a parameter α≡4t3/J. The case of α=1 corresponds to complete suppression of single-particle hopping in the strong-coupling limit of the Hubbard model. In one dimension, phase separation takes place below a critical value αc = 0.36-0.63 which depends on the electron density. Spin gap opens in the whole region except the phase-separated one. For α ≳ 1.2 and low hole densities, charge-density-wave correlations are the most dominant, whereas singlet-pairing correlations are the most dominant in the remaining region. The possibility of superconductivity in the two-dimensional case is also discussed, based on equal-time pairing correlations.
AB - The ground-state phase diagram is numerically studied for an electronic model consisting of the spin exchange term (J) and the correlated hopping term (t3: the three-site term). This model has no single-particle hopping and the ratio of the two terms is controlled by a parameter α≡4t3/J. The case of α=1 corresponds to complete suppression of single-particle hopping in the strong-coupling limit of the Hubbard model. In one dimension, phase separation takes place below a critical value αc = 0.36-0.63 which depends on the electron density. Spin gap opens in the whole region except the phase-separated one. For α ≳ 1.2 and low hole densities, charge-density-wave correlations are the most dominant, whereas singlet-pairing correlations are the most dominant in the remaining region. The possibility of superconductivity in the two-dimensional case is also discussed, based on equal-time pairing correlations.
KW - A. Superconductors
KW - D. Phase transitions
KW - D. Superconductivity
UR - http://www.scopus.com/inward/record.url?scp=0036602181&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036602181&partnerID=8YFLogxK
U2 - 10.1016/S0022-3697(02)00037-9
DO - 10.1016/S0022-3697(02)00037-9
M3 - Article
AN - SCOPUS:0036602181
VL - 63
SP - 1531
EP - 1535
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
IS - 6-8
ER -