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- W1969971266 abstract "We study the supercritical instability in gapped graphene with two charged impurities separated by distance R using the two-dimensional Dirac equation for electron quasiparticles. Attention is paid to a situation when charges of impurities are subcritical, whereas their total charge exceeds a critical one. The critical distance R_{cr} in the system of two charged centers is defined as that at which the electron bound state with the lowest energy reaches the boundary of the lower continuum. A variational calculation of the critical distance R_{cr} separating the supercritical (R<R_{cr}) and subcritical (R>R_{cr}) regimes is carried out. It is shown that the critical distance R_{cr} increases as the quasiparticle gap decreases. The energy and width of a quasistationary state as functions of the distance between two impurities are derived in the quasiclassical approximation." @default.
- W1969971266 created "2016-06-24" @default.
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- W1969971266 date "2013-11-13" @default.
- W1969971266 modified "2023-10-05" @default.
- W1969971266 title "Supercritical instability in graphene with two charged impurities" @default.
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- W1969971266 doi "https://doi.org/10.1103/physrevb.88.205116" @default.
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