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Incompressible states in double quantum dots
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Incompressible (magic) states that result from many-body effects in vertically coupled quantum dots submitted to strong magnetic fields such that only the lowest Landau level is relevant are studied within an exact diagonalization calculation for N=3, 5, and 6, electrons. We find that the sequences of total angular momentum M for which these incompressible states exist depend on the interplay between the interdot hopping parameter Δ t and the interdot distance d. For d of the order of the magnetic length and for all values of Δ t , we conclude that, in contrast to previous claims, these incompressible states appear at magic values of M which do not differ from those obtained for a single dot: namely, M=N(N-1)/2+jN, where j is a positive integer number. For large interdot distance and simultaneously small interdot hopping parameter, new sequences of magic values of M are observed. These new sequences can be easily understood in terms of a transition regime towards a system of two decoupled single dots. However, important differences in the nature of the incompressible ground states are found with respect to those of a single dot.
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BARBERÁN FALCÓN, Núria and SOTO RIERA, Joan. Incompressible states in double quantum dots. Physical Review B. 2003. Vol. 68, num. 4, pags. 045306(1)-045306(9). ISSN 0163-1829. [consulted: 9 of June of 2026]. Available at: https://hdl.handle.net/2445/10531