Electronic states in a magnetic quantum-dot molecule: phase transitions and spontaneous symmetry breaking

Details Electronic states in a magnetic quantum-dot molecule: phase transitions and spontaneous symmetry breaking Electronic states in a magnetic quantum-dot molecule: phase transitions and spontaneous symmetry breaking

2006-08-11

arxiv.org/abs/cond-mat/0608284v1

Physics

Condensed Matter

Other Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.76.075319

We show that a double quantum-dot system made of diluted magnetic semiconductor behaves unlike usual molecules. In a semiconductor double quantum dot or in a diatomic molecule, the ground state of a single carrier is described by a symmetric orbital. In a magnetic material molecule, new ground states with broken symmetry can appear due the competition between the tunnelling and magnetic polaron energy. With decreasing temperature, the ground state changes from the normal symmetric state to a state with spontaneously broken symmetry. Interestingly, the symmetry of a magnetic molecule is recovered at very low temperatures. A magnetic double quantum dot with broken-symmetry phases can be used a voltage-controlled nanoscale memory cell.

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