Bipolar spin blockade and coherent state superpositions in a triple quantum dot

Spin blockade in ground state resonance of a quantum dot

– We present measurements on spin blockade in a laterally integrated quantum dot. The dot is tuned into the regime of strong Coulomb blockade, confining ∼ 50 electrons. At certain electronic states we find an additional mechanism suppressing electron transport. This we identify as spin blockade at zero bias, possibly accompanied by a change in orbital momentum in subsequent dot ground states. W...

Spin-orbit effects in a triple quantum dot shuttle

J. Villavicencio,1,* I. Maldonado,2 E. Cota,3,† and G. Platero4,‡ 1Facultad de Ciencias, Universidad Autónoma de Baja California, Apartado Postal 1880, 22800 Ensenada, Baja California, México 2Avenida Del Fresno 188, Código Postal 22819, Ensenada, B.C., México 3Centro de Nanociencias y Nanotecnologı́a, Universidad Nacional Autónoma de México, Apartado Postal 356, 22860 Ensenada, B.C., México 4In...

Dynamical spin-blockade in a quantum dot with paramagnetic leads

– We investigate current fluctuations in a three-terminal quantum dot in the sequential tunneling regime. Dynamical spin-blockade can be induced when the spin-degeneracy of the dot states is lifted by a magnetic field. This results in super-Poissonian shot noise and positive zero-frequency cross-correlations. Our proposed setup can be realized with semiconductor quantum dots. Introduction. – No...

Edge-state blockade of transport in quantum dot arrays

We propose a transport blockade mechanism in quantum dot arrays and conducting molecules based on an interplay of Coulomb repulsion and the formation of edge states. As a model we employ a dimer chain that exhibits a topological phase transition. The connection to a strongly biased electron source and drain enables transport. We show that the related emergence of edge states is manifest in the ...

Polariton quantum blockade in a photonic dot