TY - JOUR
T1 - Theory of electron transport near anderson-mott transitions
AU - Shinaoka, Hiroshi
AU - Imada, Masatoshi
PY - 2010/11
Y1 - 2010/11
N2 - We present a theory of the DC electron transport in insulators near Anderson-Mott transitions under the influence of coexisting electron correlation and randomness. At sufficiently low temperatures, the DC electron transport in Anderson-Mott insulators is determined by the single-particle density of states (DOS) near the Fermi energy (EF). Anderson insulators, caused by randomness, are characterized by a nonzero DOS at EF. However, recently, the authors proposed that coexisting randomness and shortranged interaction in insulators open a soft Hubbard gap in the DOS, and the DOS vanishes only at EF. Based on the picture of the soft Hubbard gap, we derive a formula for the critical behavior for the temperature dependence of the DC resistivity. Comparisons of the present theory with experimental results of electrostatic carrier doping into an organic conductor k-(BEDT-TTF) 2Cu[N(CN)2]Br demonstrate the evidence for the present soft-Hubbard scaling.
AB - We present a theory of the DC electron transport in insulators near Anderson-Mott transitions under the influence of coexisting electron correlation and randomness. At sufficiently low temperatures, the DC electron transport in Anderson-Mott insulators is determined by the single-particle density of states (DOS) near the Fermi energy (EF). Anderson insulators, caused by randomness, are characterized by a nonzero DOS at EF. However, recently, the authors proposed that coexisting randomness and shortranged interaction in insulators open a soft Hubbard gap in the DOS, and the DOS vanishes only at EF. Based on the picture of the soft Hubbard gap, we derive a formula for the critical behavior for the temperature dependence of the DC resistivity. Comparisons of the present theory with experimental results of electrostatic carrier doping into an organic conductor k-(BEDT-TTF) 2Cu[N(CN)2]Br demonstrate the evidence for the present soft-Hubbard scaling.
KW - Anderson localization
KW - Anderson-Hubbard model
KW - Disorder
KW - Electron correlation
KW - Mott transition
KW - Rrandomness
KW - Single-particle density of states
KW - Soft gap
UR - http://www.scopus.com/inward/record.url?scp=78149328721&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78149328721&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.79.113703
DO - 10.1143/JPSJ.79.113703
M3 - Article
AN - SCOPUS:78149328721
VL - 79
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 11
M1 - 113703
ER -