Molecular phases in coupled quantum dots

Details Molecular phases in coupled quantum dots Molecular phases in coupled quantum dots

2004-01-09

arxiv.org/abs/cond-mat/0401145v1

Physical Review B, Vol. 69, p. 85327 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

PDF file only, 28 pages, 3 tables, 4 color figures, 2 appendices. To appear in Physical Review B, Scheduled 15 Feb 2004, Vol.

Scientific paper

10.1103/PhysRevB.69.085327

We present excitation energy spectra of few-electron vertically coupled quantum dots for strong and intermediate inter-dot coupling. By applying a magnetic field, we induce ground state transitions and identify the corresponding quantum numbers by comparison with few-body calculations. In addition to atomic-like states, we find novel "molecular-like" phases. The isospin index characterizes the nature of the bond of the artificial molecule and this we control. Like spin in a single quantum dot, transitions in isospin leading to full polarization are observed with increasing magnetic field.

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