Heavy-hole and light-hole oscillations in the coherent emission from quantum wells: Evidence for exciton-exciton correlations

Smirl, Arthur L.; Stevens, Martin J.; Chen, X.; Buccafusca, O.

doi:10.1103/physrevb.60.8267

Cited by 45 publications

(27 citation statements)

References 58 publications

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“…This indicates that EIS also contributes strongly to the coupling. In addition, coupling between opposite spin excitons has been studied by time resolving beats between heavy and light holes 19 and by observing Raman coherences. 41,42 The time-resolved results were well produced by a phenomenological model that included EID as the coupling mechanism.…”

mentioning

confidence: 99%

“…16,17 The phenomenological approach yields corrections to the OBE's, which can produce very good agreement with experiment 18 including complex polarization selection rules. 19 While the full many-body treatment is clearly based on a stronger theoretical foundation, the phenomenological description is usually easier to understand in terms of the underlying physics. The foundation provided by the full many-body treatment has been used to develop a microscopic basis for the phenomenological few level approach.…”

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confidence: 99%

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Role of excitation-induced shift in the coherent optical response of semiconductors

Shacklette

Cundiff

2002

Phys. Rev. B

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A transient four-wave-mixing signal is shown to arise from an excitation induced shift. In semiconductors, this signal can be comparable to or stronger than signals arising from saturation, local fields, or excitation induced dephasing. Calculations using modified optical Bloch equations show that multiple peaks in the transient four-wave-mixing spectrum are a signature of an excitation induced shift contributing to the signal. We observe this experimentally from a semiconductor multiple quantum well and confirm the presence of a shift directly using spectrally resolved differential transmission.The interaction between light and semiconductors provides fundamental insight into the dynamics of the optically created excitations. This is particularly true when techniques that are sensitive to coherence are employed. Coherent spectroscopy is well understood for a dilute vapor, where only isolated atoms or molecules need to be considered. 1 In dense materials, such as semiconductors or a dense atomic vapor, many-body interactions lead to dramatic differences from the dilute limit. 2 These effects can completely alter the interpretation of spectroscopic measurements and the performance of optoelectronic devices.Substantial progress has been made in understanding how interactions among elementary optical excitations ͑excitons or unbound electron-hole pairs͒ influence the coherent optical response of semiconductors, which is typically observed using transient four-wave mixing ͑TFWM͒. Early work 3-5 was interpreted based on the optical Bloch equations ͑OBE's͒, 6 which are appropriate in the dilute limit. Subsequently, it was realized that in addition to the signals arising from saturation, which are described by the OBE's, there were additional signals due to the interactions. The appearance of a signal for ''negative'' delay in a two-pulse TFWM experiment and a delay in the emission as a function of real time 7,8 are the most dramatic signatures. These effects can be calculated using a full many-body treatment. 9,10 In addition, they can be described phenomenologically in a few-level approach as arising from local fields, 11,12 excitation induced dephasing ͑EID͒, 13-15 and biexcitonic effects. 16,17 The phenomenological approach yields corrections to the OBE's, which can produce very good agreement with experiment 18 including complex polarization selection rules. 19 While the full many-body treatment is clearly based on a stronger theoretical foundation, the phenomenological description is usually easier to understand in terms of the underlying physics. The foundation provided by the full many-body treatment has been used to develop a microscopic basis for the phenomenological few level approach. 20 We show that an excitation induced shift ͑EIS͒ can result in a TFWM signal similar to that produced by the other mechanisms listed above. EIS is a manifestation of fundamental many-body interactions that result in a modification of the excitonic frequency in the presence of an excited carrier population. While the presence o...

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Role of excitation-induced shift in the coherent optical response of semiconductors

Shacklette

Cundiff

2002

Phys. Rev. B

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“…expected for cocircular-polarized excitation. Previous FWM [131], spectrally-resolved differential transmission [132], and coherent excitation spectroscopy [129] studies have shown that indeed coupling does occur in cocircular-polarized excitation, attributing it to many-body correlations. Experimental 2D spectra of both rephasing and nonrephasing pathways with cocircular-polarized excitation are shown in Fig.…”

Section: Excitation Dependence Of 2d Spectramentioning

confidence: 94%

Polarized Optical Two-dimensional Fourier Transform Spectroscopy of Semiconductors

Zhang¹,

Li²,

Cundiff³

et al. 2006

15th International Conference on Ultrafast Phenomena

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“…The splitting between the heavy-hole (hh) and light-hole (lh) excitons is 7.3 meV for one sample and ^ 12 meV for the other. All of the TRE measurements described in [24,51,52] were performed with the 7.3 meV sample, and the POLLIWOG measurements described in this chapter and in [53][54][55][56][57][58] used the % 12 meV sample. This difference in the hh-lh splittings is the only measurable distinction between the two samples that we have observed, and it is most likely the result of differing in-plane strains introduced when the samples are cooled.…”

Section: Polliwog Measurements Ofhh Emissionmentioning

confidence: 99%

(11 IOTA)-Oriented Heterostructures and Devices: The Effects of Strain and Orientation

Smirl¹

2001

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Heavy-hole and light-hole oscillations in the coherent emission from quantum wells: Evidence for exciton-exciton correlations

Cited by 45 publications

References 58 publications

Role of excitation-induced shift in the coherent optical response of semiconductors

Role of excitation-induced shift in the coherent optical response of semiconductors

Polarized Optical Two-dimensional Fourier Transform Spectroscopy of Semiconductors

(11 IOTA)-Oriented Heterostructures and Devices: The Effects of Strain and Orientation

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