TY - JOUR
T1 - Velocity renormalization near the Mott transition in a perfectly ordered lattice (II)
AU - Weger, M.
AU - Burlachkov, L.
PY - 1994/5
Y1 - 1994/5
N2 - We consider a medium-density electron gas, near the Wigner-Mott transition, immersed in a medium with a background dielectric constant ε0(q, ω)that is very large at q = 0, ω = 0, but falls sharply with increasing q and/or ω. We consider the dependence of the screening parameter for state k on the energy of this state. We find that the electronic velocity is enhanced considerably at k = kF, somewhat similar to the enhancement found by Lindhard in 1954 for an unscreened electron gas. We use parameters applicable to high-Tc cuprates. We find that the maximum of v(k) around kF is very sharp, the width being a few meV, somewhat smaller than the frequency at which the dielectric constant ε0(q, ω) drops. We relate this velocity peak to the normal-state transport properties of the cuprates and several other systems, and to the superconductivity. We point out specific experiments that suggest a large enhancement ofvF.
AB - We consider a medium-density electron gas, near the Wigner-Mott transition, immersed in a medium with a background dielectric constant ε0(q, ω)that is very large at q = 0, ω = 0, but falls sharply with increasing q and/or ω. We consider the dependence of the screening parameter for state k on the energy of this state. We find that the electronic velocity is enhanced considerably at k = kF, somewhat similar to the enhancement found by Lindhard in 1954 for an unscreened electron gas. We use parameters applicable to high-Tc cuprates. We find that the maximum of v(k) around kF is very sharp, the width being a few meV, somewhat smaller than the frequency at which the dielectric constant ε0(q, ω) drops. We relate this velocity peak to the normal-state transport properties of the cuprates and several other systems, and to the superconductivity. We point out specific experiments that suggest a large enhancement ofvF.
UR - http://www.scopus.com/inward/record.url?scp=0028430042&partnerID=8YFLogxK
U2 - 10.1016/0921-4526(94)90022-1
DO - 10.1016/0921-4526(94)90022-1
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AN - SCOPUS:0028430042
SN - 0921-4526
VL - 198
SP - 337
EP - 360
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
IS - 4
ER -