Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Optical conductivity of unconventional charge-density-wave systems : Role of vertex corrections. / Aristov, D. N.; Zeyher, R.
в: Physical Review B - Condensed Matter and Materials Physics, Том 72, № 11, 115118, 15.09.2005.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Optical conductivity of unconventional charge-density-wave systems
T2 - Role of vertex corrections
AU - Aristov, D. N.
AU - Zeyher, R.
PY - 2005/9/15
Y1 - 2005/9/15
N2 - The optical conductivity of a d-CDW conductor is calculated for electrons on a square lattice and a nearest-neighbor charge-charge interaction using the lowest-order conserving approximation. The spectral properties of the Drude-like peak at low frequencies and the broad hump due to transitions across the gap at large frequencies are discussed, also as a function of temperature and of the second-nearest neighbor hopping term t′. We find that vertex corrections enhance the dc conductivity, make the Drude peak narrower and provide a smooth transition from a renormalized regime at low to the bare theory at high frequencies. It is also shown that vertex corrections enhance the temperature dependence of the restricted optical sum leading to a non-negligible violation of the sum rule in the d-CDW state.
AB - The optical conductivity of a d-CDW conductor is calculated for electrons on a square lattice and a nearest-neighbor charge-charge interaction using the lowest-order conserving approximation. The spectral properties of the Drude-like peak at low frequencies and the broad hump due to transitions across the gap at large frequencies are discussed, also as a function of temperature and of the second-nearest neighbor hopping term t′. We find that vertex corrections enhance the dc conductivity, make the Drude peak narrower and provide a smooth transition from a renormalized regime at low to the bare theory at high frequencies. It is also shown that vertex corrections enhance the temperature dependence of the restricted optical sum leading to a non-negligible violation of the sum rule in the d-CDW state.
UR - http://www.scopus.com/inward/record.url?scp=29844454109&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.72.115118
DO - 10.1103/PhysRevB.72.115118
M3 - Article
AN - SCOPUS:29844454109
VL - 72
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 11
M1 - 115118
ER -
ID: 36119191