Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths

Sapienza, Luca; Al-Khuzheyri, Rima; Dada, Adetunmise C.; Griffiths, Andrew; Clarke, Edmund M.; Gerardot, Brian D.

doi:10.1103/physrevb.93.155301

Cited by 9 publications

(6 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this letter, we report on two-photon Rabi splitting in a strongly coupled cavity-dot system consisting of a nanocavity and two exciton states (X and XX) from a single QD. The obtained single-photon coupling strengths are about 130 µeV, twice over the previous value [25], which is due to the large oscillation strength and the large wave function overlapping with cavity mode, resulting from relatively large size of QDs [28,29]. Meanwhile quantum confinement is weak in large QDs, leading to a small binding energy [30,31].…”

mentioning

confidence: 72%

Two-Photon Rabi Splitting in a Coupled System of a Nanocavity and Exciton Complexes

Qian

Song

et al. 2018

Phys. Rev. Lett.

View full text Add to dashboard Cite

Two-photon Rabi splitting in a cavity-dot system provides a basis for multiqubit coherent control in a quantum photonic network. Here we report on two-photon Rabi splitting in a strongly coupled cavity-dot system. The quantum dot was grown intentionally large in size for a large oscillation strength and small biexciton binding energy. Both exciton and biexciton transitions couple to a high-quality-factor photonic crystal cavity with large coupling strengths over 130 μeV. Furthermore, the small binding energy enables the cavity to simultaneously couple with two exciton states. Thereby, two-photon Rabi splitting between the biexciton and cavity is achieved, which can be well reproduced by theoretical calculations with quantum master equations.

show abstract

mentioning

confidence: 72%

Two-Photon Rabi Splitting in a Coupled System of a Nanocavity and Exciton Complexes

Qian

Song

et al. 2018

Phys. Rev. Lett.

View full text Add to dashboard Cite

show abstract

“…13,18 . A better understanding of this effect would be provided by the implementation of charge-tunable devices that allow to address specific charged states in the quantum dots 19,20 . We would like to stress that our metallic rings are fully compatible with charge-tunable devices, where the ring itself, while enhancing the extraction efficiency, could also be used as a top contact to apply the electric field.…”

mentioning

confidence: 99%

Metallic nanorings for broadband, enhanced extraction of light from solid-state emitters

Trojak

Park

Song

et al. 2017

Applied Physics Letters

Self Cite

View full text Add to dashboard Cite

We report on the increased extraction of light emitted by solid-state sources embedded within high refractive index materials. This is achieved by making use of a local lensing effect by sub-micron metallic rings deposited on the sample surface and centered around single emitters. We show enhancements in the intensity of the light emitted by InAs/GaAs single quantum dot lines into free space as high as a factor 20. Such a device is intrinsically broadband and therefore compatible with any kind of solid-state light source. We foresee the fabrication of metallic rings via scalable techniques, like nano-imprint, and their implementation to improve the emission of classical and quantum light from solid-state sources. Furthermore, while increasing the brightness of the devices, the metallic rings can also act as top contacts for the local application of electric fields for carrier injection or wavelength tuning.PACS numbers: 42.82. Bq, 78.55.Cr, 78.60.Lc, 78.67.Hc a) Electronic mail: o.trojak@soton.ac.uk b) Electronic mail: l.sapienza@soton.ac.uk; www.quantum.soton.ac.uk 1 Extracting light into free space is one of the challenges to face when dealing with solidstate emitters embedded within high-index materials. At the air interface total internal reflection can trap most of the light within the higher index material, thus preventing efficient light extraction, that can be as low as a few percent. Such an issue needs to be faced when dealing with emitters like light-emitting diodes 1 and lasers 2 based, for instance, on quantum wells or quantum dots. In the same way as for classical light emitters, extraction efficiency has been the focus of intensive research when dealing with intrinsically dimmer sources like single-photon emitters for fundamental science 3,4 and quantum information technology applications 5 . Amongst solid-state quantum light sources, molecular beam epitaxial quantum dots (QDs) are of particular interest as they are directly grown on a semiconductor chip (thus allowing easy integration within optical circuits), they can have lifetime-limited emission lines 6 and can emit pure and indistinguishable single photons 7 .Several approaches have been followed to increase the extraction efficiency of light emitted by QDs into free space. For instance, optical cavities embedding single emitters have been fabricated to channel the emitted light into specific optical modes. Examples are micropillars, based on distributed Bragg reflectors 7 , nanowires 8 and circular grating cavities on suspended membranes 9,10 . Such optical cavities require the coupling of the emission from a source into a specific optical mode that the emitter needs to be resonant with. Fabrication processes can require multilayer growth (for micropillars) and deep etching (for micropillars and nanowires) or a calibrated etch (for circular grating cavities). High aspect ratio devices or suspended membranes also require non-trivial fabrication processes if one wants to include electrical tuning or injection to improve the device performance...

show abstract

“…Over the years there has been a number of experimental efforts to better characterize the g factor of InGaAs QDs [26][27][28][29][30][31][32][33][34][35]. A complication that arises in most of these magnetoluminescence-based measurements is the extraction from the excitonic g factor that of the electronic contribution [6,8,27,28,30,31,33,34], which hinders its sign, a concern also shared by the magnetocapacitance [29], and photocurrent spectroscopy experiments [35].…”

Section: Introductionmentioning

confidence: 99%

Electron ground state g factor in embedded InGaAs quantum dots: An atomistic study

Kahraman

Bulutay

2021

Phys. Rev. B

View full text Add to dashboard Cite

We present atomistic computations within an empirical pseudopotential framework for the electron s-shell ground state g tensor of InGaAs quantum dots (QDs) embedded to host matrices that grant electronic confinement. A large structural set consisting of geometry, size, and molar fraction variations is worked out which also includes a few representative uniform strain cases. The tensor components are observed to display insignificant discrepancies even for the highly anisotropic shapes. The family of g-factor curves associated with these parameter combinations coalesces to a single universal one when plotted as a function of the gap energy, thus confirming a recent assertion reached under much restrictive conditions. Our work extends its validity to alloy QDs with various shapes and finite confinement that allows for penetration to the host matrix, placing it on a more realistic basis. Accordingly, the electrons in InGaAs QDs having s-shell transition energies close to 1.13 eV will be least susceptible to magnetic field. We also show that low indium concentration offers limited g-factor tunability under shape or confinement variations. These findings can be taken into consideration in the fabrication and the use of InGaAs QDs with g-near-zero or other targeted g values for spintronic or electron spin resonance-based direct quantum logic applications.

show abstract

Magneto-optical spectroscopy of single charge-tunable InAs/GaAs quantum dots emitting at telecom wavelengths

Cited by 9 publications

References 38 publications

Two-Photon Rabi Splitting in a Coupled System of a Nanocavity and Exciton Complexes

Two-Photon Rabi Splitting in a Coupled System of a Nanocavity and Exciton Complexes

Metallic nanorings for broadband, enhanced extraction of light from solid-state emitters

Electron ground state g factor in embedded InGaAs quantum dots: An atomistic study

Contact Info

Product

Resources

About