Observation of autodissociating excited states of excitonic molecules

Labrie, D.; Karasyuk, V. A.; Nissen, M. K.; Pokrovskiı̆, Ya. E.; Thewalt, M. L. W.

doi:10.1103/physrevb.47.1628

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…The lowest energy transition, which lies outside our experimental detection window, produced biexcitons in their lowest energy configuration (i.e., the biexciton ground state). Induced absorption bands at higher probe photon energies, in the visible portion of the transient spectrum, are attributed to the formation of biexcitons with excited state configurations (e,h;e*,h*), analogous to those observed in inorganic systems. − Our data suggest that nanotubes, like their inorganic counterparts, can support a manifold of multiexcitonic species.…”

Section: Introductionsupporting

confidence: 55%

“…Induced absorption bands at higher probe photon energies, in the visible portion of the transient spectrum, are attributed to the formation of biexcitons with excited state configurations (e,h;e*,h*), analogous to those observed in inorganic systems. [72][73][74][75][76] Our data suggest that nanotubes, like their inorganic counterparts, can support a manifold of multiexcitonic species.…”

Section: Introductionmentioning

confidence: 95%

“…In fact, a variety of multiexciton species, including biexcitons, triexcitons, and even four-exciton complexes, are well-documented in quantum wells, wires, and dots formed from inorganic semiconductors. [70][71][72][73][74][75][76] Often referred to as excitonic molecules, these excitations can exist in a range of electronic configurations that are akin to the ground and excited states found in molecular systems. The question thus arises: Do nanotubes support similar multiexcitonic states?…”

Section: Introductionmentioning

confidence: 99%

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Exciton Dynamics and Biexciton Formation in Single-Walled Carbon Nanotubes Studied with Femtosecond Transient Absorption Spectroscopy

et al. 2008

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We used femtosecond transient absorption (TA) spectroscopy to examine the excited state dynamics of singlewalled carbon nanotube (SWNT) bundles embedded in polymer matrices. The SWNTs were excited by a femtosecond pump pulse centered at either 1800, 900, or 550 nm and probed using a white-light continuum extending from 400 to 750 nm. We observed a structured TA spectrum consisting of a series of narrow induced transmission (IT) and induced absorption (IA) bands. The TA spectrum, which is independent of excitation wavelength, appeared on a time scale shorter than our instrument response (200 fs) and persisted for up to 100 ps. TA spectra obtained at a series of pump-probe delay times provided a window through which to monitor the exciton dynamics. We observed three distinct spectral signatures in the time-dependent data: (1) the decay of a broad photobleach, (2) the biphasic decay of narrow IT and IA features, and (3) a dynamical spectral shift of IA bands. These processes were attributed to plasmon relaxation, electron-hole recombination, and lattice relaxation associated with exciton self-trapping, respectively. Analysis of the transient spectrum suggested that it arose from a nonlinear optical response of the SWNT, where excitons produced by the pump pulse modified the transition frequencies of subsequent carrier excitations. The result was a series of IT bands (bleaches) at the ground state absorption frequencies, and associated with each was a corresponding red-shifted absorption band. These induced absorptions were attributed to the formation of biexcitons, fourparticle excitations that are produced through the sequential excitation of two closely spaced electron-hole pairs.

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Section: Introductionsupporting

confidence: 55%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Exciton Dynamics and Biexciton Formation in Single-Walled Carbon Nanotubes Studied with Femtosecond Transient Absorption Spectroscopy

et al. 2008

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“…The subsequent studies of trions during the next decades were focused, both experimentally and theoretically, on semiconductors. [2][3][4][5][6][7][8][9][10] To our knowledge, the first experimental evidence for a trionic state in LiF was found by Khemliche et al 11 who studied the neutralization of Ne + ions during grazing incidence on a lithium fluoride surface. By measurement of the energy loss and final charge state of the projectile in coincidence with the energy spectrum of emitted electrons they identified two main neutralization channels.…”

Section: Introductionmentioning

confidence: 99%

Excitation energy and pair correlation function of trions near an LiF surface

2008

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We investigate the excitation spectrum of a singly charged LiF surface using an embedded cluster approach. The spectrum is determined by multiconfiguration self-consistent field calculations. We find stable trionic states, i.e., quasimolecular states of a three-quasiparticle complex consisting of two holes and one electron interacting through the Coulomb potential. The excitation energy of the lowest trionic state is approximately 12.1 eV. The mean hole-hole spacing is about 7.6 a.u. ͑or 4 Å͒. Our results confirm the interpretation of experiments ͓P. Roncin et al., Phys. Rev. Lett. 89, 043201 ͑2002͔͒ where trion excitation was suggested as effective energy-loss channel during the neutralization of Ne + ions at an LiF surface.

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“…[9][10][11] Because of higher energies compared to rotational and vibrational excited states and the difference in symmetry they are not as difficult to resolve. Unlike these studies, in the present paper we focus on rotational and vibrational excited states of biexcitons.…”

Section: Introductionmentioning

confidence: 99%

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

et al. 2001

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Excited states of excitonic molecules have been observed by the direct method of giant two-photon absorption in a monoclinic ZnP 2 single crystal. Their origin and comparison with theoretical expectations are discussed. Photoluminescence of thermalized and nonthermalized ''cold'' excitonic molecules was studied under resonant two-photon excitation into their ground and excited states. An alternative mechanism of inelastic scattering of excitonic molecules is suggested.

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Observation of autodissociating excited states of excitonic molecules

Cited by 4 publications

References 11 publications

Exciton Dynamics and Biexciton Formation in Single-Walled Carbon Nanotubes Studied with Femtosecond Transient Absorption Spectroscopy

Exciton Dynamics and Biexciton Formation in Single-Walled Carbon Nanotubes Studied with Femtosecond Transient Absorption Spectroscopy

Excitation energy and pair correlation function of trions near an LiF surface

Two-photon absorption into excited states of excitonic molecules and their inelastic scattering inZnP2

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