High-Resolution Two-Dimensional Optical Spectroscopy of Electron Spins

Salewski, M.; Poltavtsev, S. V.; Yugova, I. A.; Karczewski, G.; Wiater, M.; Wójtowicz, T.; Yakovlev, D. R.; Акимов, И. А.; Meier, Torsten; Bayer, М.

doi:10.1103/physrevx.7.031030

Cited by 15 publications

(34 citation statements)

References 38 publications

(54 reference statements)

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“…To account for this contribution, we measured the KR and PE signals for different magnetic fields and evaluated the dependences of Ω L and dephasing times on B. Both methods give identical B−linear dependencies of Ω L , from which we obtain |g e | = 1.60, in agreement with previous reports [21,25,28]. Details are given in the Appendix A.…”

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confidence: 85%

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Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes

et al. 2019

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Spin-dependent photon echoes in combination with pump-probe Kerr rotation are used to study the microscopic electron spin transport in a CdTe/(Cd,Mg)Te quantum well in the hopping regime. We demonstrate that independent of the particular spin relaxation mechanism, hopping of resident electrons leads to a shortening of the photon echo decay time, while the transverse spin relaxation time evaluated from pump-probe transients increases due to motional narrowing of spin dynamics in the fluctuating effective magnetic field of the lattice nuclei.

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confidence: 85%

“…The difference between the Larmor precession frequencies for resonant excitation of X − and D 0 X complexes is well pronounced. This difference originates from the difference in the g factor of resident electrons localized in potential fluctuations and bound to donors [21]. Figure 6 shows signals obtained in RSA measurements.…”

Section: Kerr Rotationmentioning

confidence: 99%

Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes

et al. 2019

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“…In the present paper, we have chosen the model system of a CdTe/(Cd,Mg)Te QW with spectrally well isolated optical transitions, that was previously studied by other FWM-based techniques [21,26]. In particular, to precisely distinguish between the donor-bound exciton and trion transitions three-pulse photon echo spectroscopy in an external magnetic field was carried out [26]. These two optical transitions were distinguished using a difference in the g-factor, whose spectral dependence revealed a step-like behavior in the relevant spectral range.…”

Section: B Discussionmentioning

confidence: 99%

Polarimetry of photon echo on charged and neutral excitons in semiconductor quantum wells

Poltavtsev

Kapitonov

Yugova

et al. 2019

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Coherent optical spectroscopy such as four-wave mixing and photon echo generation deliver rich information on the energy levels involved in optical transitions through the analysis of polarization of the coherent response. In semiconductors, it can be applied to distinguish between different exciton complexes, which is a highly non-trivial problem in optical spectroscopy. We develop a simple approach based on photon echo polarimetry, in which polar plots of the photon echo amplitude are measured as function of the angle φ between the linear polarizations of the two exciting pulses. The rosette-like polar plots reveal a distinct difference between the neutral and charged exciton (trion) optical transitions in semiconductor nanostructures. We demonstrate this experimentally by photon echo polarimetry of a CdTe/(Cd, Mg)Te quantum well. The echoes of the trion and donor-bound exciton are linearly polarized at the angle 2 φ with respect to the first pulse polarization and their amplitudes are weakly dependent on φ . While on the exciton the photon echo is co-polarized with the second exciting pulse and its amplitude scales as cos φ .

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“…Four-wave mixing experiments on trions in Voigt geometry were performed only recently. [21,[23][24][25] There quantum beats at the Larmor precession frequency were observed for the intensity of the photon echo. However, no polarization quantum beats were recorded in this system yet.…”

Section: Pacs Numbersmentioning

confidence: 95%

“…resonant fluorescence and fourwave mixing) were performed using the Faraday geometry. Using the Voigt geometry, the magnetic field leads to doubly coupled Λ energy schemes [20][21][22]. Four-wave mixing experiments on trions in Voigt geometry were performed only recently.…”

Section: Pacs Numbersmentioning

confidence: 99%

Quantum beats in the polarization of the spin-dependent photon echo from donor-bound excitons in CdTe/(Cd,Mg)Te quantum wells

et al. 2020

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We study the quantum beats in the polarization of the photon echo from donor-bound exciton ensembles in semiconductor quantum wells. To induce these quantum beats, a sequence composed of a circularly polarized and a linearly polarized picosecond laser pulse in combination with an external transverse magnetic field is used. This results in an oscillatory behavior of the photon echo amplitude, detected in the σ + and σ − circular polarizations, occurring with opposite phases relative to each other. The beating frequency is the sum of the Larmor frequencies of the resident electron and the heavy hole when the second pulse is polarized along the magnetic field. The beating frequency is, on the other hand, the difference of these Larmor frequencies when the second pulse is polarized orthogonal to the magnetic field. The measurement of both beating frequencies serves as a method to determine precisely the in-plane hole g factor, including its sign. We apply this technique to observe the quantum beats in the polarization of the photon echo from the donor-bound excitons in a 20-nm-thick CdTe/Cd0.76Mg0.24Te quantum well. From these quantum beats we obtain the in-plane heavy hole g factor g h = −0.143 ± 0.005. PACS numbers:Quantum beats are a phenomenon due to resonant coherent excitation of (at least) two discrete quantum mechanical states with different energies, leading to a superposition state. Quantum beats can be manifested by oscillations in the coherent optical response of the system due to interference of the excited polarizations, where the oscillation frequency corresponds to the energy difference between the levels [1]. A typical example are the oscillations observed in resonance fluorescence or other coherent spectroscopy techniques from excitons in semiconductors, which can be represented by V-type energy level arrangements with a common crystal ground state that is optically coupled to two split excited exciton states [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Quantum beats on excitons in semiconductors and their nanostructures have been observed for a large variety of excited states corresponding to the beating between, e.g., heavy-and light-hole excitons [2][3][4], the exiton states of a fine structure doublet with different spin configurations [5][6][7][8], as well as neutral and charged excitons [9][10][11][12]. Application of a magnetic field can be used to split (quasidegenerate) excitonic states by the Zeeman effect and to observe the corresponding quantum beats in the polarized optical response [5,13,14]. In this case, the splitting of the optically active exciton states, having opposite angular momentum projections ±1 onto the quantization axis along which also the magnetic field is applied, leads to quantum beats in the polarization rather than the intensity of the emitted light. The period of the oscilla-tions corresponds to the Zeeman splitting between the spin levels and can be used for evaluation of the g factors of the excitons. Another advantage of the Zeeman effect induced quantum bea...

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High-Resolution Two-Dimensional Optical Spectroscopy of Electron Spins

Cited by 15 publications

References 38 publications

Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes

Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes

Polarimetry of photon echo on charged and neutral excitons in semiconductor quantum wells

Quantum beats in the polarization of the spin-dependent photon echo from donor-bound excitons in CdTe/(Cd,Mg)Te quantum wells

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