Excitation spectroscopy of single quantum dots at tunable positive, neutral, and negative charge states

Benny, Y.; Kodriano, Y.; Poem, Eilon; Gershoni, D.; Truong, Thanh-Dat; Petroff, P. M.

doi:10.1103/physrevb.86.085306

Cited by 39 publications

(54 citation statements)

References 40 publications

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“…Up to the terms linear in L/a, the summation over the index p is performed analytically: (18) The operator on the right hand side of this formula under the action of the specified angular momentum on the function changes its value to 3. Therefore, its matrix element between the functions is nonzero.…”

Section: Magnetically Induced Mixing Of Heavy Holesmentioning

confidence: 99%

“…Intermediate electron-hole complexes formed during the relaxation of such a cascade-the so called "hot" (or excited) excitons and trions-are interesting in that charge carriers (an electron or a hole) occupy in them excited states with P symmetry. "Hot" excitons and trions, as well as electron-hole complexes with a high net charge, have been actively investigated in recent years in InAs and GaAs based quantum dots grown along the [001] direction [18][19][20][21]. Multiple charged electron-hole complexes and excited states of negatively charged trions were exper imentally observed in trigonal GaAs/AlGaAs quan tum dots grown along the [111] axis in [22].…”

Section: Introductionmentioning

confidence: 99%

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Fine structure of electron-hole complexes in trigonal quantum dots

Durnev

2015

Phys. Solid State

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A theory of the Zeeman effect and fine structure of the energy spectrum of electron-hole com plexes in highly symmetric quantum dots grown along the [111] direction from materials with a zinc blende lattice has been presented. In the studied quantum dots with C 3v point symmetry, the Zeeman effect for a heavy hole in a magnetic field B || [111] has an unusual form: in addition to the diagonal component (g h1 ), the effective tensor of g factors contains the off diagonal element (g h2 ). For g h2 ≠ 0, there is a magnetically induced mixing of heavy hole states, which explains two additional lines observed in experimental photolu minescence spectra of excitons and trions. A microscopic theory of the effective g factors g h1 and g h2 within the Luttinger Hamiltonian in the spherical approximation has been discussed, as well as additional contribu tions to the off diagonal element g h2 due to the warping of the spectrum of holes. The results of theoretical calculations of the g factors g h1 and g h2 for quantum dots based on GaAs have been compared with the exper imental data.

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Section: Magnetically Induced Mixing Of Heavy Holesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fine structure of electron-hole complexes in trigonal quantum dots

Durnev

2015

Phys. Solid State

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“…The electronic and optical properties of such QDs are sensitively modified by the exact number of charge carriers and their multiple spin configurations, QD shape, and stress or the doping surroundings, among others. 5,6 Entangled photon pair sources, as required for quantum cryptography purposes, are found in radiative cascades from biexcitons to neutral excitons, 7 while the spin manipulation, as required for quantum information memories, is more properly assisted by the trion transition (charged exciton). 8 Coherent control of those phenomena has been recently achieved by manipulating charged and hot species (species with a carrier at the excited state).…”

mentioning

confidence: 99%

Exciton and multiexciton optical properties of single InAs/GaAs site-controlled quantum dots

Canet‐Ferrer

Muñoz‐Matutano

Herranz³

et al. 2013

Applied Physics Letters

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We have studied the optical properties of InAs site-controlled quantum dots (SCQDs) grown on prepatterned GaAs substrates. Since InAs nucleates preferentially on the lithography motifs, the location of the resulting QDs is determined by the pattern, which is fabricated by local oxidation nanolithography. Optical characterization has been performed on such SCQDs to study the fundamental and excited states. At the ground state different exciton complex transitions of about 500 leV linewidth have been identified and the fine structure splitting of the neutral exciton has been determined (%65 leV). The observed electronic structure covers the demands of future quantum information technologies. V C 2013 AIP Publishing LLC. [http://dx

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“…By tuning the excitation energy, intensity, and sample temperature, the average charge state of the QD and the charge-carrier capture rate can be controlled to some extent. 33 This has been used in our experiment to adjust the detection rates for photons from the XX 0 T±3 state and the respective trion state. T0 -X 0 cascade, bunching is observed in cross-rectilinear polarization measurements (VH), in contrast to the XX 0 -X 0 cascade, confirming the selection rules and energy level alignment illustrated in Fig.…”

Section: Apl Photonics 2 121303 (2017)mentioning

confidence: 99%

Accessing the dark exciton spin in deterministic quantum-dot microlenses

et al. 2017

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The dark exciton state in semiconductor quantum dots constitutes a long-lived solid-state qubit which has the potential to play an important role in implementations of solid-state based quantum information architectures. In this work, we exploit deterministically fabricated QD microlenses with enhanced photon extraction, to optically prepare and readout the dark exciton spin and observe its coherent precession. The optical access to the dark exciton is provided via spin-blockaded metastable biexciton states acting as heralding state, which are identified deploying polarization-sensitive spectroscopy as well as time-resolved photon cross-correlation experiments. Our experiments reveal a spin-precession period of the dark exciton of $(0.82\pm0.01)\,$ns corresponding to a fine-structure splitting of $(5.0\pm0.7)\,\mu$eV between its eigenstates $\left|\uparrow\Uparrow\pm\downarrow\Downarrow\right\rangle$. By exploiting microlenses deterministically fabricated above pre-selected QDs, our work demonstrates the possibility to scale up implementations of quantum information processing schemes using the QD-confined dark exciton spin qubit, such as the generation of photonic cluster states or the realization of a solid-state-based quantum memory.Comment: 5 pages, 3 figure

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Excitation spectroscopy of single quantum dots at tunable positive, neutral, and negative charge states

Cited by 39 publications

References 40 publications

Fine structure of electron-hole complexes in trigonal quantum dots

Fine structure of electron-hole complexes in trigonal quantum dots

Exciton and multiexciton optical properties of single InAs/GaAs site-controlled quantum dots

Accessing the dark exciton spin in deterministic quantum-dot microlenses

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