Electromagnetically induced transparency with an ensemble of donor-bound electron spins in a semiconductor

Sladkov, Maksym; Chaubal, Alok U.; Bakker, Morten P.; Onur, A. R.; Reuter, D.; Wieck, A. D.; Wal, van der Caspar

doi:10.1103/physrevb.82.121308

Cited by 17 publications

(29 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optical transitions at 4.2 K show an inhomogeneous linewidth of 6 GHz, which is not expected to narrow at lower temperatures. Also, the electron spin dephasing time for the D 0 system is limited by hyperfine coupling to fluctuating nuclear spins, and this mechanism is temperature independent in the range 10 mK to 4.2 K. Our attempts to suppress these fluctuations via dynamical nuclear polarization (DNP) only showed a very small improvement of the dephasing time till now, since the optically induced DNP effects appeared to be very weak in our experiments 28 . For the discussion of applications of our system we therefore focus on data taken at 4.2 K.…”

Section: B Heat Load and Heat-sinking Of Optical Powermentioning

confidence: 99%

Polarization-preserving confocal microscope for optical experiments in a dilution refrigerator with high magnetic field

Sladkov

Bakker

Chaubal

et al. 2011

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

We present the design and operation of a fiber-based cryogenic confocal microscope. It is designed as a compact cold-finger that fits inside the bore of a superconducting magnet, and which is a modular unit that can be easily swapped between use in a dilution refrigerator and other cryostats. We aimed at application in quantum optical experiments with electron spins in semiconductors and the design has been optimized for driving with, and detection of optical fields with well-defined polarizations. This was implemented with optical access via a polarization maintaining fiber together with Voigt geometry at the cold finger, which circumvents Faraday rotations in the optical components in high magnetic fields. Our unit is versatile for use in experiments that measure photoluminescence, reflection, or transmission, as we demonstrate with a quantum optical experiment with an ensemble of donor-bound electrons in a thin GaAs film.

show abstract

Section: B Heat Load and Heat-sinking Of Optical Powermentioning

confidence: 99%

Polarization-preserving confocal microscope for optical experiments in a dilution refrigerator with high magnetic field

Sladkov

Bakker

Chaubal

et al. 2011

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

show abstract

“…The robust spin coherence and the atomic-like D 0 X transitions in GaAs have enabled the experimental realization of coherent optical phenomena, such as coherent population trapping and electromagnetically induced transparency associated with donor-bound electrons. 4,5 Optical spin control of donor-bound electrons has also been realized with the use of single off-resonant ultrafast laser pulses, 6 although only a limited degree of spin rotation (π/3 or less) has been achieved in spite of the spectrally sharp D 0 X transitions. In comparison, ultrafast optical spin rotations exceeding multiples of π have been successfully demonstrated for single as well as ensemble electron spins in QDs 7-9 and for ensemble electron spins in modulation-doped quantum wells (QWs).…”

Section: Introductionmentioning

confidence: 99%

Coherent spin dynamics of donor bound electrons in GaAs

et al. 2011

View full text Add to dashboard Cite

We report experimental studies of coherent spin dynamics of donor-bound electrons in high-purity GaAs by using transient differential transmission. The donor-bound exciton transitions, which are not visible in the linear absorption spectrum, are spectrally resolved in the nonlinear differential transmission spectra. The spin beats in the transient differential transmission response, arising from electron spin precession in an external magnetic field, are investigated with the pump and probe coupling to various donor-bound exciton transitions. The spectral dependence of the spin beats provides important information on the polarization selection rule for the underlying donor-bound exciton transitions. The polarization selection rules deduced from these experiments indicate that contributions from higher-energy donor-bound exciton transitions can severely limit the effectiveness of optical spin control using mechanisms such as polarization-dependent optical Stark shifts.

show abstract

“…1(b) to the Lindblad equation for the Λ-system [25]. Our n-GaAs samples yield an inhomogeneous dephasing time T * 2 ≈ 3 ns [24]. However, the homogeneous dephasing time T 2 has been estimated to be at least 7 µs [26] with a spin-echo technique.…”

mentioning

confidence: 99%

“…CPT is a narrow resonance in two-laser driving as in Fig. 1(a) [24] where the system gets trapped in a dark state (for ideal spin coherence |Ψ ∝ Ω 2 |↑ − Ω 1 |↓ ). In transmission this appears as a narrow window of increased transparency within the broader absorption dip when one laser is scanning while the other is fixed ( Fig.…”

mentioning

confidence: 99%

“…The value of δ = pδ max is proportional to the nuclear spin polarization p ∈ [−1, 1], where δ max is the maximum shift set by the hyperfine interaction strength. For the donor electron in GaAs δ max = 24.5 GHz (obtained from the maximum Overhauser field [27] via δ = gµ B B n /2h with g-factor g = −0.41 [24]). The thermal equilibrium properties of the nuclear spin bath are well approximated by considering N non-interacting spins I with gyromagnetic ratio γ.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Stabilizing nuclear spins around semiconductor electrons via the interplay of optical coherent population trapping and dynamic nuclear polarization

Onur¹,

Jong²,

O’Shea³

et al. 2016

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We experimentally demonstrate how coherent population trapping (CPT) for donor-bound electron spins in GaAs results in autonomous feedback that prepares stabilized states for the spin polarization of nuclei around the electrons. CPT was realized by excitation with two lasers to a bound-exciton state. Transmission studies of the spectral CPT feature on an ensemble of electrons directly reveal the statistical distribution of prepared nuclear spin states. Tuning the laser driving from blue to red detuned drives a transition from one to two stable states. Our results have importance for ongoing research on schemes for dynamic nuclear spin polarization, the central spin problem and control of spin coherence.PACS numbers: 03.65. Yz, 42.50.Ex, 76.30.Mi, 76.70.Hb, 78.47.jh Following the emergence of electron spins in quantum dots and solid state defects as candidates for spin qubits it has become a major goal to realize control over the nuclear spins in such nanostructures. In many experimental settings, interaction with disordered nuclear spins in the crystal environment is detrimental to the coherent evolution of carefully prepared electron spin states [1][2][3]. Preparation of nuclear spins in a state that has reduced spin fluctuations with respect to the thermal equilibrium state will help to overcome this problem [4]. Proposals to achieve this goal have been put forward for electron spin resonance (ESR) on one-or two-electron quantum dots [5,6], and for optical preparation techniques that either rely on a quantum measurement technique [7,8] or a stochastic approach [9][10][11]. Experimental advances have been made with ESR and optical techniques on single quantum dots [12][13][14][15][16][17][18] and nitrogen-vacancy centers [19], and on quantum dot ensembles [20,21].Several of these works [8-11, 15, 18, 19] make use of the optical response of the electronic system near the coherent-population-trapping resonance (CPT, explained below) because it is highly sensitive to perturbations from nuclear spins. Notably, these experiments so far have focussed on quantum dots where, due to the particular anisotropic confinement, hyperfine coupling with a hole-spin in the excited state is reported to dominate [15]. In recent work [22] we discussed how the interplay between electron-nuclear spin interaction and CPT influences the stochastics of the nuclear spin bath for a class of systems where hyperfine interaction with the groundstate electron spin dominates.Here we report experiments on this latter class of systems. We demonstrate an all-optical technique that stabilizes the nuclear spin bath around localized donor electrons in GaAs into a non-thermal state under conditions of two-laser optical pumping. We show that the nuclear spin system is directed either towards a single stable state or (probabilistically) towards one of two stable states, depending on laser detuning from the excited state. Our results show how feedback control arises from the interplay between CPT and dynamic nuclear spin polarization (DNP), and confi...

show abstract

Electromagnetically induced transparency with an ensemble of donor-bound electron spins in a semiconductor

Abstract: Electromagnetically induced transparency with an ensemble of donor-bound electron spins in a semiconductor Sladkov, Maksym; Chaubal, A. U.; Bakker, M. P.; Onur, A. R.; Reuter, D.; Wieck, A. D.; van der Wal, C. H.

Cited by 17 publications

References 16 publications

Polarization-preserving confocal microscope for optical experiments in a dilution refrigerator with high magnetic field

Polarization-preserving confocal microscope for optical experiments in a dilution refrigerator with high magnetic field

Coherent spin dynamics of donor bound electrons in GaAs

Stabilizing nuclear spins around semiconductor electrons via the interplay of optical coherent population trapping and dynamic nuclear polarization

Contact Info

Product

Resources

About