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- W2769181017 abstract "We present a description of vacuum polarization in a circular Dirac quantum dot in two spatial dimensions assuming $alpha$ - the relative strength of the Coulomb interaction small enough to render an approximation with a single electron (hole) lowest energy level relevant. Applying this approximation, we find that for $ alpha_c approx 1.05$ the lowest level is half-filled irrespective of the number of flavors that are present. The ground state can be represented as a superposition of particular (even number) excitonic states which constitute an excitonic cloud that evolves in a crossover manner. The ground state is degenerate with an intervalley excitonic state at $ alpha_c approx 1.05$, a critical strength, that in our approximation marks a point with single electron and exciton resonances." @default.
- W2769181017 created "2017-12-04" @default.
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- W2769181017 date "2017-11-27" @default.
- W2769181017 modified "2023-09-24" @default.
- W2769181017 title "Excitonic physics in a Dirac quantum dot" @default.
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- W2769181017 doi "https://doi.org/10.1103/physrevb.96.195434" @default.
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