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Models of coherent exciton condensation

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Figure

Figure 1.OccupancyrLorentzian form (expected for a hydrogenic exciton) at low density
Figure 2. Sketch of the energy per particle E0 (solid line) and chemical potentialµ (dotted) relative to the band edge, along with the correlation gap ∆ = ∆(kmin)(dash-dot).Also shown is the minimum excitation energy Emin = min(Ek)(dashed) and the wavevector kmin (think solid line) of the minimum gap.Typically, the density parameter r0 marking the BCS-BEC crossover is around2-3.
Figure 3.(a) and (b) show a sketch of the quasiparticle spectrumBCS crossover. In the lower panels, (c) and (d) give for comparable regimes thespectrum of excitations of total momentuma steeply rising phase mode and most of the phase space is occupied by g
Figure 4.Estimates of the coherence temperatures inquantum wells of [40], andA(solid line, Eq
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