Issue |
EPL
Volume 96, Number 2, October 2011
|
|
---|---|---|
Article Number | 27004 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/96/27004 | |
Published online | 05 October 2011 |
Strong correlation effects and optical conductivity in electron-doped cuprates
1
Physics Department, Northeastern University - Boston, MA 02115, USA
2
Theoretical Division, Los Alamos National Laboratory - Los Alamos, NM 87545, USA
Received:
30
May
2011
Accepted:
31
August
2011
We demonstrate that most features ascribed to strong correlation effects in various spectroscopies of the electron-doped cuprates are captured by a calculation of the self-energy incorporating effects of spin and charge fluctuations. The self-energy is calculated over the full doping range of electron-doped cuprates from half filling to the overdoped system. The self-energy devides the low-energy physics of cuprates into two energy scales: an antiferromagnetic (AFM) “pseudogap” region near the Fermi level and a high-energy “Mott gap region”. The corresponding spectral function reveals four subbands, two widely split incoherent bands representing the remnant of the split Hubbard bands, and two additional coherent, spin- and charge-dressed in-gap bands split by a spin-density-wave, which collapses in the overdoped regime. The incoherent features persist to high doping, producing a remnant Mott gap in the optical spectra, while transitions between the in-gap states lead to AFM pseudogap features in the mid-infrared.
PACS: 74.25.Gz – Optical properties / 74.72.-h – Cuprate superconductors / 74.20.Mn – Nonconventional mechanisms
© EPLA, 2011
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