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- W2013587013 abstract "High-temperature copper oxide superconductors (cuprates) display unconventional physics when they are lightly doped whereas the standard theory of metals prevails in the opposite regime. For example, the thermoelectric power, that is the voltage that develops across a sample in response to a temperature gradient, changes sign abruptly near optimal doping in a wide class of cuprates, a stark departure from the standard theory of metals in which the thermopower vanishes only when one electron exists per site. We show that this effect arises from proximity to a state in which particle-hole symmetry is dynamically generated. The operative mechanism is dynamical spectral weight transfer from states that lie at least 2 eV away from the chemical potential. We show that the sign change is reproduced quantitatively within the Hubbard model for moderate values of the on-site repulsion, $U$. For sufficiently large values of on-site repulsion, for example, $U=20t$ ($t$ the hopping matrix element), dynamical spectral weight transfer attenuates and our calculated results for the thermopower are in prefect agreement with exact atomic limit. The emergent particle-hole symmetry close to optimal doping points to pairing in the cuprates being driven by high-energy electronic states." @default.
- W2013587013 created "2016-06-24" @default.
- W2013587013 creator A5006379658 @default.
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- W2013587013 date "2010-12-03" @default.
- W2013587013 modified "2023-10-16" @default.
- W2013587013 title "Emergence of particle-hole symmetry near optimal doping in high-temperature copper oxide superconductors" @default.
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- W2013587013 doi "https://doi.org/10.1103/physrevb.82.214503" @default.
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