2006
DOI: 10.1103/physrevlett.97.076403
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Optically Probing Spin and Charge Interactions in a Tunable Artificial Molecule

Abstract: We optically probe and electrically control a single artificial molecule containing a well defined number of electrons. Charge and spin dependent interdot quantum couplings are probed optically by adding a single electron-hole pair and detecting the emission from negatively charged exciton states. Coulomb- and Pauli-blockade effects are directly observed, and tunnel coupling and electrostatic charging energies are independently measured. The interdot quantum coupling is shown to be mediated by electron tunneli… Show more

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Cited by 111 publications
(127 citation statements)
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“…Tunnel coupling, anticrossings, and spin interactions of electrons and holes in both neutral and charged excitons have been observed. 12,13,14,15 In this work we focus on the tunnel coupling of holes in the neutral exciton state, as depicted in Fig. 1a.…”
Section: Energy Level Structure Of the Neutral Excitonmentioning
confidence: 99%
“…Tunnel coupling, anticrossings, and spin interactions of electrons and holes in both neutral and charged excitons have been observed. 12,13,14,15 In this work we focus on the tunnel coupling of holes in the neutral exciton state, as depicted in Fig. 1a.…”
Section: Energy Level Structure Of the Neutral Excitonmentioning
confidence: 99%
“…4,5,6,7,8 Similarly, it is the electron redistribution between the dots due to a rotation of a weak horizontal field that allows for the detection of the non-perfect alignment, the hole charge being only shifted within the separate dots. Therefore, we decided to use for simplicity the single band model to describe the hole.…”
Section: Introductionmentioning
confidence: 99%
“…For vertically coupled quantum dots 3 the electric field oriented in the growth direction leads to a redistribution of the carriers between the dots. 4,5,6,7,8 Typical electric field applied for vertically coupled quantum dots is of the order of 20-30 kV/cm, i.e., by an order of magnitude smaller than the one used to probe the confinement potential 1 of a single dot. Therefore, such experiments on the electric-field effect for coupled dots resolve rather the properties of the molecular coupling than the fabrication dependent details of the confinement in separate dots.…”
Section: Introductionmentioning
confidence: 99%
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“…Using the latest growth, and fabrication techniques it is possible to control properties of the dots such as emission wavelength [13], providing access to telecom wavelengths [14], and positioning [15]. The ability to grow electronically coupled quantum dots [16] offers the possibility of building a few q-bit register. Whilst, recent demonstrations of non-classical light sources [17,18], and dot in cavity structures with strong single photon optical nonlinearities [19] are examples of potential quantum devices based on semiconductor quantum dots.…”
Section: Introductionmentioning
confidence: 99%