Fizika Nizkikh Temperatur: Volume 44, Number 12 (December 2018), p. 1618-1629    ( to contents , go back )

Properties of the ground state of electronic excitations in carbon-like nanocones

Yurii A. Sitenko1 and Volodymyr M. Gorkavenko2

1Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine 14-b Metrologichna Str., Kyiv 03143, Ukraine
E-mail: yusitenko@bitp.kiev.ua

2Department of Physics, Taras Shevchenko National University of Kyiv 64 Volodymyrs'ka Str., Kyiv 01601, Ukraine

Received July 3, 2018, published online October 26, 2018

Abstract

On the basis of the continuum model for long-wavelength charge carriers, originating in the tight-binding approximation for the nearest-neighbour interaction of atoms in the crystalline lattice, we consider quantum ground-state effects of electronic excitations in Dirac materials with two-dimensional monolayer honeycomb structures warped into nanocones by a disclination; the nonzero size of the disclination is taken into account, and a boundary condition at the edge of the disclination is chosen to ensure self-adjointness of the Dirac–Weyl Hamiltonian operator. We show that the quantum ground-state effects are independent of the disclination size and find circumstances when they are independent of a parameter of the boundary condition. The magnetic flux circulating in the angular direction around the nanocone apex and the pseudomagnetic flux directed orthogonally to the nanocone surface are shown to be induced in the ground state.

Key words: Dirac materials; nanocones; ground state; quantum effects in monolayer crystals.

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