polyacetylene/atrophy

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5 torthaí

Excitation of a breather mode of bound soliton pairs in trans-polyacetylene by sub-five-femtosecond optical pulses.

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Logáil Isteach / Cláraigh

Trans-polyacetylene with a degenerate ground state has a nonlinear excitation of soliton after photoexcitation, due to the electron-phonon coupling. The excess energy of an excited electron-hole pair over a soliton pair creation induces a breather oscillation characterized by collective stretching

Measurement of complex Chi((3)) using degenerate four-wave mixing with an imaged 2-D phase grating.

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Logáil Isteach / Cláraigh

We present a simple optical arrangement for phase sensitive detection of degenerate four-wave mixing (DFWM) to characterize the real and imaginary parts of Chi((3)) using an imaged 2-D phase grating. Phase sensitive coherent detection of DFWM signal is demonstrated. Phase stabilization of the

Evidence for solitonic spin excitations from a charge-lattice-coupled ferroelectric order.

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Logáil Isteach / Cláraigh

Topological defects have been explored in different fields ranging from condensed matter physics and particle physics to cosmology. In condensed matter, strong coupling between charge, spin, and lattice degrees of freedom brings about emergent excitations with topological characteristics at low

Hybrid coupled-cluster and perturbation method for extended systems of one-dimensional periodicity.

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Logáil Isteach / Cláraigh

A hybrid of the coupled-cluster singles and doubles (CCSD) and second-order Møller-Plesset perturbation (MP2) methods [M. Nooijen, J. Chem. Phys. 111, 10815 (1999); A. D. Bochevarov and C. D. Sherrill, ibid. 122, 234110 (2005); A. D. Bochevarov et al., ibid. 125, 054109 (2006)] is formulated and

Real-space imaging of a topologically protected edge state with ultracold atoms in an amplitude-chirped optical lattice.

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Logáil Isteach / Cláraigh

To describe a mobile defect in polyacetylene chains, Su, Schrieffer and Heeger formulated a model assuming two degenerate energy configurations that are characterized by two different topological phases. An immediate consequence was the emergence of a soliton-type edge state located at the boundary

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