Optically Probing Spin and Charge Interactions in a Tunable Artificial Molecule

Krenner, Hubert J.; Ec, Clark; Nakaoka, Toshihiro; Bichler, Max; Scheurer, Christoph; Abstreiter, G.; Jj, Finley

doi:10.1103/physrevlett.97.076403

Cited by 111 publications

(127 citation statements)

References 19 publications

Supporting

Mentioning

119

Contrasting

Unclassified

Order By: Relevance

“…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%

Hole-spin mixing in InAs quantum dot molecules

et al. 2010

View full text Add to dashboard Cite

Holes confined in single InAs quantum dots have recently emerged as a promising system for the storage or manipulation of quantum information. These holes are often assumed to have only heavy-hole character and further assumed to have no mixing between orthogonal heavy hole spin projections (in the absence of a transverse magnetic field). The same assumption has been applied to InAs quantum dot molecules formed by two stacked InAs quantum dots that are coupled by coherent tunneling of the hole between the two dots. We present experimental evidence of the existence of a hole spin mixing term obtained with magneto-photoluminescence spectroscopy on such InAs quantum dot molecules. We use a Luttinger spinor model to explain the physical origin of this hole spin mixing term: misalignment of the dots along the stacking direction breaks the angular symmetry and allows mixing through the light-hole component of the spinor. We discuss how this novel spin mixing mechanism may offer new spin manipulation opportunities that are unique to holes.

show abstract

Section: Energy Level Structure Of the Neutral Excitonmentioning

confidence: 99%

Hole-spin mixing in InAs quantum dot molecules

et al. 2010

View full text Add to dashboard Cite

show abstract

“…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%

“…10 It also successfully predicted 8 non-trivial features of the photoluminescence spectrum observed during the negative trion dissociation by the electric field. 6 A vertical electric field was used very recently 7 to verify the growth process of intentionally strongly asymmetric double quantum dots. In this paper we demonstrate that the horizonal electric field (perpendicular to the growth direction) can be useful to estimate the non-perfect vertical alignment of the dots and to determine the direction of the horizontal shift between them.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stark effect on the exciton spectra of vertically coupled quantum dots: Horizontal field orientation and nonaligned dots

2007

View full text Add to dashboard Cite

We study the effect of an electric-field on an electron-hole pair in an asymmetric system of vertically coupled self-assembled quantum dots taking into account their non-perfect alignment. We show that the non-perfect alignment does not qualitatively influence the exciton Stark effect for the electric field applied in the growth direction, but can be detected by application of a perpendicular electric field. We demonstrate that the direction of the shift between the axes of non-aligned dots can be detected by rotation of a weak electric field within the plane of confinement. Already for a nearly perfect alignment the two-lowest energy bright exciton states possess antilocked extrema as function of the orientation angle of the horizontal field which appear when the field is parallel to the direction of the shift between the dot centers.

show abstract

“…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%

Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole

Ramsay¹,

Boyle²,

Godden³

et al. 2009

Solid State Communications

View full text Add to dashboard Cite

A hole spin is a potential solid-state q-bit, that may be more robust against nuclear spin induced dephasing than an electron spin. Here we propose and demonstrate the sequential preparation, control and detection of a single hole spin trapped on a self-assembled InGaAs/GaAs quantum dot. The dot is embedded in a photodiode structure under an applied electric-field. Fast, triggered, initialization of a hole spin is achieved by creating a spin-polarized electron-hole pair with a picosecond laser pulse, and in an applied electricfield, waiting for the electron to tunnel leaving a spin-polarized hole. Detection of the hole spin with picosecond time resolution is achieved a second picosecond laser pulse to probe the positive trion transition, where a trion is created conditional on the hole spin to be detected as a change in photocurrent. Finally, using this setup we observe a Rabi rotation of the hole-trion transition that is conditional on the hole spin, which for a pulse-area of 2π can be used to impart a phase-shift of π between the hole spin states, a non-general manipulation of the hole spin.

show abstract

Optically Probing Spin and Charge Interactions in a Tunable Artificial Molecule

Cited by 111 publications

References 19 publications

Hole-spin mixing in InAs quantum dot molecules

Hole-spin mixing in InAs quantum dot molecules

Stark effect on the exciton spectra of vertically coupled quantum dots: Horizontal field orientation and nonaligned dots

Towards coherent optical control of a single hole spin: Rabi rotation of a trion conditional on the spin state of the hole

Contact Info

Product

Resources

About