A new class of collective excitations

Exciton strings

Sumitendra Mazumdar, F. Guo, K. Meissner, B. Fluegel, Nasser N Peyghambarian, M. Kuwata-Gonokami, Y. Sato, K. Ema, R. Shimano, T. Tokihiro, H. Ezaki, E. Hanamura

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Optical excitation in a strongly neutral quasi-one-dimensional mixed-stack charge-transfer solid results in an exciton state, in which the electron and the hole are bound by electrostatic Coulomb interactions that are large compared to the one-electron hopping. We present a joint theoretical-experimental demonstration of a new class of collective excitations, multiexcitons or exciton strings, consisting of a string of several (more than two) bound excitons, in a prototype neutral charge-transfer solid. The stability of the multiexciton states arise from the combined effects of one dimensionality and strong Coulomb interactions. Theoretically, we show that in narrow band one-dimensional semiconductors with long range Coulomb interactions, the occurrence of stable 2-exciton string (biexciton) necessarily implies stable higher multiexcitons. Experimentally, evidence for the multiexciton strings is demonstrated by femtosecond pump-probe spectroscopy of anthracene pyromellitic acid dianhydride. Excellent qualitative agreement is found between the calculated and the measured differential transmission spectra. Photoinduced absorptions to the 2-exciton string at low pump intensity and to the 3-exciton string at high pump intensity are observed, in agreement with the theory of excited state absorption. The 2-exciton string is confirmed also by a direct two-photon absorption measurement. The binding energies of the 2-exciton and the 3-exciton strings are obtained from the experimental data. The larger binding energy of the 3-exciton is in agreement with theory.

Original languageEnglish (US)
Pages (from-to)9283-9291
Number of pages9
JournalThe Journal of Chemical Physics
Volume104
Issue number23
StatePublished - Jun 15 1996

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strings
excitons
excitation
Coulomb interactions
Pumps
pumps
Binding energy
Charge transfer
binding energy
charge transfer
LDS 751
Electrons
Photoexcitation
interactions
anthracene
Excited states
narrowband
Electrostatics
Demonstrations
Photons

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Mazumdar, S., Guo, F., Meissner, K., Fluegel, B., Peyghambarian, N. N., Kuwata-Gonokami, M., ... Hanamura, E. (1996). A new class of collective excitations: Exciton strings. The Journal of Chemical Physics, 104(23), 9283-9291.

A new class of collective excitations : Exciton strings. / Mazumdar, Sumitendra; Guo, F.; Meissner, K.; Fluegel, B.; Peyghambarian, Nasser N; Kuwata-Gonokami, M.; Sato, Y.; Ema, K.; Shimano, R.; Tokihiro, T.; Ezaki, H.; Hanamura, E.

In: The Journal of Chemical Physics, Vol. 104, No. 23, 15.06.1996, p. 9283-9291.

Research output: Contribution to journalArticle

Mazumdar, S, Guo, F, Meissner, K, Fluegel, B, Peyghambarian, NN, Kuwata-Gonokami, M, Sato, Y, Ema, K, Shimano, R, Tokihiro, T, Ezaki, H & Hanamura, E 1996, 'A new class of collective excitations: Exciton strings', The Journal of Chemical Physics, vol. 104, no. 23, pp. 9283-9291.
Mazumdar S, Guo F, Meissner K, Fluegel B, Peyghambarian NN, Kuwata-Gonokami M et al. A new class of collective excitations: Exciton strings. The Journal of Chemical Physics. 1996 Jun 15;104(23):9283-9291.
Mazumdar, Sumitendra ; Guo, F. ; Meissner, K. ; Fluegel, B. ; Peyghambarian, Nasser N ; Kuwata-Gonokami, M. ; Sato, Y. ; Ema, K. ; Shimano, R. ; Tokihiro, T. ; Ezaki, H. ; Hanamura, E. / A new class of collective excitations : Exciton strings. In: The Journal of Chemical Physics. 1996 ; Vol. 104, No. 23. pp. 9283-9291.
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