Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 38: 2D materials: Chalcogenides II (joint session HL/DS)

HL 38.8: Vortrag

Donnerstag, 15. März 2018, 11:30–11:45, A 151

Effective theory of monolayer TMDC double quantum dots — •Alessandro David, Andor Kormányos, and Guido Burkard — Department of Physics, University of Konstanz, D-78464, Germany

Monolayer Transition Metal Dichalcogenides (TMDCs) are promising candidates for the creation of quantum dots, because they are truly two-dimensional semiconductors with a direct band gap. One of their features is an intrinsic spin-orbit interaction that splits the spins in the conduction and valence band. In this work, we analyse theoretically the behaviour of a double quantum dot (DQD) system created in the conduction band of these materials, with two electrons in the regime of the (1,1) charge configuration. Motivated by recent experimental progress, we consider several scenarios, such as when the spin splitting is different in the two dots or when the the valley degeneracy in the TMDC is removed due to a ferromagnetic insulator substrate. Finally, we discuss in which cases it is possible to reduce the low energy subspace to the lowest Kramer's pairs, where novel interactions appear.