Abstract
Critical exponents of metal-insulator transitions are studied for an extended Hubbard model within the Hartree-Fock approximation. At zero temperature, we find that the first-order transition line between a symmetry broken (antiferromagnetic or charge-ordered) metal and an insulator terminates at the "marginally quantum critical point", where an unconventional universality class emerges. This universality is in agreement with the scaling theory and explains the exponents obtained by recent experiments on (V, Cr)2 O3 and κ-(ET)2 Cu (Cn)2 Cl in a unified way as a crossover from the marginally quantum universality and the Ising universality.
| Original language | English |
|---|---|
| Pages (from-to) | 925-927 |
| Number of pages | 3 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 310 |
| Issue number | 2 SUPPL. PART 1 |
| DOIs | |
| Publication status | Published - 2007 Mar 1 |
| Externally published | Yes |
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Keywords
- Metal-insulator transitions
- Mott transition
- Quantum critical phenomena
ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Marginal quantum criticality of metal-insulator transitions. / Misawa, Takahiro; Yamaji, Youhei; Imada, Masatoshi.
In: Journal of Magnetism and Magnetic Materials, Vol. 310, No. 2 SUPPL. PART 1, 01.03.2007, p. 925-927.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Marginal quantum criticality of metal-insulator transitions
AU - Misawa, Takahiro
AU - Yamaji, Youhei
AU - Imada, Masatoshi
PY - 2007/3/1
Y1 - 2007/3/1
N2 - Critical exponents of metal-insulator transitions are studied for an extended Hubbard model within the Hartree-Fock approximation. At zero temperature, we find that the first-order transition line between a symmetry broken (antiferromagnetic or charge-ordered) metal and an insulator terminates at the "marginally quantum critical point", where an unconventional universality class emerges. This universality is in agreement with the scaling theory and explains the exponents obtained by recent experiments on (V, Cr)2 O3 and κ-(ET)2 Cu (Cn)2 Cl in a unified way as a crossover from the marginally quantum universality and the Ising universality.
AB - Critical exponents of metal-insulator transitions are studied for an extended Hubbard model within the Hartree-Fock approximation. At zero temperature, we find that the first-order transition line between a symmetry broken (antiferromagnetic or charge-ordered) metal and an insulator terminates at the "marginally quantum critical point", where an unconventional universality class emerges. This universality is in agreement with the scaling theory and explains the exponents obtained by recent experiments on (V, Cr)2 O3 and κ-(ET)2 Cu (Cn)2 Cl in a unified way as a crossover from the marginally quantum universality and the Ising universality.
KW - Metal-insulator transitions
KW - Mott transition
KW - Quantum critical phenomena
UR - http://www.scopus.com/inward/record.url?scp=33847289791&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33847289791&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2006.10.526
DO - 10.1016/j.jmmm.2006.10.526
M3 - Article
AN - SCOPUS:33847289791
VL - 310
SP - 925
EP - 927
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 2 SUPPL. PART 1
ER -