Quantum Beats of Excitons in Cu2O at Double Optical Resonance

Shmiglyuk, M. I.; Bobrysheva, A. I.; Pavlov, V. G.

doi:10.1002/1521-3951(199702)199:2<427::aid-pssb427>3.0.co;2-y

Cited by 3 publications

(3 citation statements)

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“…Actually the p-like excitons showing up in one photon absorption spectroscopy are only the subseries with symmetry ⌫ 4 − and all other remaining p states have never been experimentally observed. 38 With regard to 1s → 2p transitions this implies that only the 2p ortho ⌫ 4 − energy is experimentally known and one could in principle expect fine structures. An estimation yields that possible splitting mechanisms should range on a sub-meV scale.…”

Section: A Selection Rules and Density Calibrationmentioning

confidence: 99%

Midinfrared properties of cuprous oxide: High-order lattice vibrations and intraexcitonic transitions of the1sparaexciton

et al. 2005

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This contribution addresses both the general mid-infrared ͑MIR͒ properties of Cu 2 O and induced absorption due to intraexcitonic 1s → 2p transitions under simultaneous cw laser excitation. After an overview of the current state of knowledge and remaining open questions concerning excitons in Cu 2 O we will first discuss several absorption bands in the spectral range between approximately 100 and 150 meV in terms of multiphonon and biphonon features. The second, more extensive part will concern a pump-probe experiment in the limit of low densities of 1s excitons where we investigated intraexcitonic transitions appearing in the MIR spectral range as well. We find a signal which can be clearly assigned to a 1s para→ 2p para transition and present various data depending on excitation conditions and sample temperature. Applying the results of detailed theoretical considerations we can estimate the density and lifetime of the 1s para-exciton and at least speculate about its dispersion.

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Section: A Selection Rules and Density Calibrationmentioning

confidence: 99%

Midinfrared properties of cuprous oxide: High-order lattice vibrations and intraexcitonic transitions of the1sparaexciton

et al. 2005

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“…34) The studies and application of quantum beats of excitons that originated from a quantum interference of two exciton transitions from ground level to two close-lying excited levels of exciton have received much attention from scientists in the field. [35][36][37] The quantum beats of excitons in lowdimensional semiconductor structures were first investigated in semiconductor quantum wells. [38][39][40][41] Then, experimental measurements of this phenomenon are expanded to semiconductor quantum dot structures.…”

Section: Introductionmentioning

confidence: 99%

A study on quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires

Phuoc

Bao

Hien

et al. 2020

Jpn. J. Appl. Phys.

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This paper presents a theoretical investigation of quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires. A three-level model of excitons, including a ground state and two excited states, has been applied to derive the renormalized wavefunctions and the time-dependent absorption intensity of excitons when the system is irradiated by a strong pump laser resonating with the distance between the two excited-levels. Our results show that a periodic oscillation form of the absorption intensity, obvious evidence of the quantum beat behavior, has appeared. Furthermore, the mechanism of the generation, as well as the effects of the wire radius and the pump laser detuning on the frequency (period) and amplitude of quantum beats, have been explained in detail. These results suggest potential applications in the fabrication of some quantum computation devices.

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“…Cu 2 O is well known for its beautiful series of np excitons (n ¼ main quantum number), the energies of which perfectly fulfill the 1=n 2 relation known from atomic hydrogen. These p-like excitons, showing up in one photon absorption spectroscopy, are only a subseries of all existing p states, namely those having symmetry G À 4 [2] and all remaining p states have never been experimentally observed.…”

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Infrared absorption by excitons in Cu₂O

Jörger¹,

Tsitsishvili

Fleck

et al. 2003

Physica Status Solidi (b)

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In a differential absorption experiment the induced infrared transitions from the excitonic 1s to the 2p levels in Cu 2 O have been investigated. Intermediate densities of 1s excitons were created by cw-laser excitation while the interexcitonic 1s to 2p transitions were probed simultaneously, using Fourier spectroscopy. Our data give evidence for a surprisingly large splitting of the 2p level (%3.7 meV) the origin of which is a matter of speculation. An analysis of lineshape and width of the transitions results in a ratio of the effective masses m 1s =m 2p which deviates from the literature value.1 Introduction Compared to normal interband spectroscopy, the study of infrared transitions between different excitonic states can reveal valuable additional information. Due to the different selection rules, states which are invisible for interband spectroscopy, might show up in intersubband spectroscopy which therefore can serve to explore possible finestructures. Furthermore it gives access to the whole populated k-space and as a consequence, the lineshape provides information about dispersion and distribution of the initial and final states.In our contribution we apply the concept of excitonic intersubband spectroscopy to Cu 2 O, which is a naturally grown bulk semiconductor with a direct bandgap at the G point (E g % 2:17 eV at T ¼ 6 K [1]). Cu 2 O is well known for its beautiful series of np excitons (n ¼ main quantum number), the energies of which perfectly fulfill the 1=n 2 relation known from atomic hydrogen. These p-like excitons, showing up in one photon absorption spectroscopy, are only a subseries of all existing p states, namely those having symmetry G

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Quantum Beats of Excitons in Cu2O at Double Optical Resonance

Cited by 3 publications

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Midinfrared properties of cuprous oxide: High-order lattice vibrations and intraexcitonic transitions of the1sparaexciton

Midinfrared properties of cuprous oxide: High-order lattice vibrations and intraexcitonic transitions of the1sparaexciton

A study on quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires

Infrared absorption by excitons in Cu₂O

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Quantum Beats of Excitons in Cu2O at Double Optical Resonance

Cited by 3 publications

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Midinfrared properties of cuprous oxide: High-order lattice vibrations and intraexcitonic transitions of the1sparaexciton

Midinfrared properties of cuprous oxide: High-order lattice vibrations and intraexcitonic transitions of the1sparaexciton

A study on quantum beats of excitons in GaAs/AlGaAs circular cylindrical quantum wires

Infrared absorption by excitons in Cu2O

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Infrared absorption by excitons in Cu₂O