Resonantly excited coherent optical phonons in wide-gap semiconductor ZnTe

Kasai, Yohei; Suzuki, Daisuke; Kunugita, Hideyuki; Ema, Kazuhiro

doi:10.1016/j.jlumin.2009.04.102

Cited by 6 publications

(10 citation statements)

References 10 publications

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“…Indeed, experiments with pulse lengths of few tens of fs have successfully been shown to create coherent phonons. [22][23][24][25] The present model has the big advantage that it allows for an analytical solution under the excitation by an arbitrary sequence of such ultrafast laser pulses. 26,27 Within this model, the Hamiltonian of the whole system readsĤ…”

Section: Model Systemmentioning

confidence: 99%

Generation and dynamics of phononic cat states after optical excitation of a quantum dot

et al. 2011

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We study theoretically the fluctuation properties of optical phonons generated after optical excitation of a quantum dot. If the quantum dot exciton is optically manipulated by ultrafast laser pulses, the electronic system and the phonon system can become entangled, which strongly influences the fluctuation properties of the phonons. When reduced to the phonon system, such an entanglement corresponds to a mixed phonon state. We discuss excitations with one or two ultrafast laser pulses. For a single pulse excitation, in general, a statistical mixture of two coherent states is found. For more pulses, a statistical mixture of superpositions of coherent states builds up in the phonon system. With the help of the Wigner function, which provides an intuitive picture of the generated phonon states, we explain how these states are formed depending on the excitation conditions and illustrate their time evolution. From this the fluctuation properties of the corresponding states can be well interpreted and the conditions for obtaining phonon squeezing are identified.

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Section: Model Systemmentioning

confidence: 99%

Generation and dynamics of phononic cat states after optical excitation of a quantum dot

et al. 2011

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“…The wide bandgap semiconductor ZnTe is widely employed as both the detection and generation medium in terahertz‐related optical and spectroscopy setups 1 . Due to its wide applications, the ultrafast dynamics and origin of the coherent phonons in ZnTe have been intensely studied and debated over the past decades 2‐9 …”

Section: Introductionmentioning

confidence: 99%

Ultrafast photoexcitation dynamics of ZnTe crystals by femtosecond optical pump‐probe and terahertz emission spectroscopy

Liu

Chen

Yao

et al. 2020

Micro & Optical Tech Letters

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In this work we perform ultrafast optical pump‐optical probe (OPOP) and optical pump terahertz (THz) emission (OPTE) studies on the ultrafast excitation dynamics in <110> ZnTe crystals. Ultrafast two‐photon absorption and coherent phonon are revealed in OPOP measurements. Pump‐power‐ and polarization‐dependent phonon dynamics are characterized in time‐resolved transmission, reflection, and Kerr rotation using OPOP. The phonon polariton‐induced THz emission is directly observed in the time domain of OPTE dynamics. It is clear that the transverse optical phonon at ~3.7 THz and phonon polariton at ~2.6 THz are evident in OPOP measurement while OPTE only reveals part of the polariton dynamics.

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“…[12][13][14][15] It has been successfully applied to clarify the relationship between each mode and the emergence of the above physical properties. [2][3][4][5][6][7][8][9] This method utilizes laser pulses shorter than the period of lattice vibration, and the oscillation spectrum bandwidth of the laser pulses is, in principle, wider than the frequency of the phonon to be selectively excited.…”

Section: Introductionmentioning

confidence: 99%

Mode-selective phonon excitation in gallium nitride using mid-infrared free-electron laser

Kagaya

Yoshida

Zen

et al. 2017

Jpn. J. Appl. Phys.

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The single-phonon mode was selectively excited in a solid-state sample. A mid-infrared free-electron laser, which was tuned to the target phonon mode, was irradiated onto a crystal cooled to a cryogenic temperature, where modes other than the intended excitation were suppressed. An A 1 (LO) vibrational mode excitation on GaN(0001) face was demonstrated. Anti-Stokes Raman scattering was used to observe the excited vibrational mode, and the appearance and disappearance of the scattering band at the target wavenumber were confirmed to correspond to on and off switching of the pump free-electron laser and were fixed to the sample vibrational mode. The sum-frequency generation signals of the pump and probe lasers overlapped the Raman signals and followed the wavenumber shift of the pump laser.

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Resonantly excited coherent optical phonons in wide-gap semiconductor ZnTe

Cited by 6 publications

References 10 publications

Generation and dynamics of phononic cat states after optical excitation of a quantum dot

Generation and dynamics of phononic cat states after optical excitation of a quantum dot

Ultrafast photoexcitation dynamics of ZnTe crystals by femtosecond optical pump‐probe and terahertz emission spectroscopy

Mode-selective phonon excitation in gallium nitride using mid-infrared free-electron laser

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