Phase Diagram of an Exciton in the Phonon Field

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概要

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• It is shown that an electron and a hole interacting mutually through the Coulombforce in the acoustic-phonon field take, within the adiabatic approximation, fourpossible phases depending upon the coupling constants: the lowest state is the freeexciton in phase[I], the large-radius self-trapped exciton in [114, the small-radius self-trapped exciton in [III"], and a pair of self-trapped electron and self-trapped hole in[111 ]. The center-of-mass motion of exciton changes discontinuously to be self-trappedas one moves from [14 to [11] or [I[I"] with increase in the phonon-coupling constants.The relative motion of exciton changes discontinuously to be self-shrinked as onemoves from [14 or [114 to [III"]. [III"] and [111 ] are realized respectively for the sameand opposite sign of the deformation potentials of electron and hole.'When theCoulomb interaction energy is so large as to be comparable to the electron and holeband widths, discontinuous boundary between [114 and [III"] disappears.

• 社団法人日本物理学会の論文
• 1977-10-15

著者

• Sumi Atsuko

  The Institute For Solid State Physics University Of Tokyo

関連論文

• Discontinuity in the Polaron Ground State
• Phase Diagram of an Exciton in the Phonon Field

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