Research in the Gweon Group
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| <<fl(T)>>he density of states is a basic quantity that students learn, when they learn how to describe free electrons in a solid. As the name suggests, it says how many electrons the material can accomodate at a certain energy value. | L<<fl(T)>>he density of states (DOS) is a basic quantity, e.g., for describing free electrons in a solid. As the name suggests, it says how many electrons the material can accomodate at a certain energy value. In a strongly correlated electron system such as high temperature superconductors, the equivalent quantity is the ''many body'' density of states (MBDOS), $\int d\vec k A(\vec k, \omega)$, where $A$ is the single particle spectral function, measured by ARPES. Even when the DOS is predicted to be finite at the Fermi energy (“band metal”), strong correlation can lead to a vanishing MBDOS (“Mott-Hubbard insulator”). A very important question that has been very tough to answer so far is “does the Mott insulator physics have a distinctive signature in near the optimally doped high temperature superconductor?” === Links === * <<ln("http://arxiv.org/abs/1310.4668", "The manuscript")>> * [[pECFL|Phenomenological ECFL]] * [[sECFL|Simple ECFL]] |
Anomalous nodal many body density of states
LThe density of states (DOS) is a basic quantity, e.g., for describing free electrons in a solid. As the name suggests, it says how many electrons the material can accomodate at a certain energy value.
In a strongly correlated electron system such as high temperature superconductors, the equivalent quantity is the many body density of states (MBDOS), $\int d\vec k A(\vec k, \omega)$, where $A$ is the single particle spectral function, measured by ARPES. Even when the DOS is predicted to be finite at the Fermi energy (“band metal”), strong correlation can lead to a vanishing MBDOS (“Mott-Hubbard insulator”).
A very important question that has been very tough to answer so far is “does the Mott insulator physics have a distinctive signature in near the optimally doped high temperature superconductor?”