Erratum: Polarizability, correlation energy, and dielectric liquid phase of Bose-Einstein condensate of two-dimensional excitons in a strong perpendicular magnetic field [Phys. Rev. B66, 245316 (2002)]

Bose-Einstein condensation and superfluidity of magnetoexcitons in bilayer graphene

“…These may result in persistent electrical currents in each QW or coherent optical properties and Josephson junction phenomena [5,6,7,8,9]. In high magnetic fields, two-dimensional (2D) excitons survive in a substantially wider temperature range, as the exciton binding energies increase with magnetic field [10,11,12,13,14,15,16].In this Letter we propose a new physical realization of magnetoexcitonic BEC and superfluidity in bilayer graphene with spatially separated electrons and holes in high magnetic field. Recent technological advances have allowed the production of graphene, which is a 2D honeycomb lattice of carbon atoms that form the basic planar structure in graphite [17,18] Graphene has been attracting a great deal of experimental and theoretical attention because of unusual properties in its bandstructure [19,20,21,22].…”

The collective elementary excitations of 2D magnetoexcitons in the BEC state with wave vector k=0

“…A hidden symmetry and the multiplicative states were discussed in many papers [19,23,24]. The collective states such as the Bose-Einstein condensation (BEC) of two-dimensional magnetoexcitons and the formation of metallic-type electron-hole liquid (EHL) were investigated in [15][16][17][18][19][20][21][22]. The search for Bose-Einstein condensates has became a milestone in the condensed matter physics [25].…”

“…Promising candidates for experimental realization of such system are semiconductor quantum wells (QWs) [26], which have a number of advantages compared to the bulk systems. The coherent pairing of electrons and holes occupying only the lowest Landau levels (LLLs) was studied using the KeldyshKozlov-Kopaev method and the generalized random-phase approximation [20,27]. The BEC of magnetoexcitons takes place in a single exciton state with wave vector k, supposing that the high density of electrons in the conduction band and of holes in the valence band were created in a single QW structure with size quantization much greater than the Landau quantization.…”

“…Properties of the symmetric 2D electron-hole (e-h) system (i.e. 0 h = ), with equal concentrations for both components, with coincident matrix elements of Coulomb electron-electron, hole-hole and electron-hole interactions in a strong perpendicular magnetic field also attracted a great attention during last two decades [15][16][17][18][19][20][21][22]. A hidden symmetry and the multiplicative states were discussed in many papers [19,23,24].…”

Collective elementary excitations of Bose–Einstein condensed magnetoexcitons interacting with strongly correlated electron–hole plasma

“…The condensation of magnetoexcitons was studied some time ago [2,3], and recently discussed in Ref. [4] in connection with a novel phase transition to the dielectric liquid with positive compressibility. In the present paper, the effect of the collective quantum fluctuation associated with the center-of-mass motion of electron-hole pairs is studied in the frame of Hartree-Fock (HF) approximation.…”