S. Mazumdar

Theory of coexisting charge and spin-density waves in (TMTTF)(2)Br, (TMTSF)(2)PF6, and alpha-(BEDT-TTF)(2)MHg(SCN)(4)

Recent experiments indicate that the spin-density waves (SDWs) in (TMTTF)_2Br, (TMTSF)_2PF_6 and alpha-(BEDT-TTF)_2MHg(SCN)_4 are highly unconventional and coexist with charge-density waves (CDWs). We present a microscopic theory of this unusual CDW-SDW coexistence. A complete understanding requires the explicit inclusion of strong Coulomb interactions, lattice discreteness, the anisotropic two-dimensional nature of the lattice, and the correct bandfilling within the starting Hamiltonian.

Photophysics of excitons in quasi-one-dimensional organic semiconductors : Single-walled carbon nanotubes and π-conjugated polymers

The nature of the primary photoexcitations in semiconducting single-walled carbon nanotubes (S-SWCNTs) is of strong current interest. We have studied the emission spectra of S-SWCNTs and two different

Systematic characterization of excited states in conjugated polymers

\pi

Theory of photoexcitations in phenylene-based polymers

-conjugated polymers in solutions and films, and have also performed ultrafast pump-probe spectroscopy on these systems. The emission spectra relative to the absorption bands are very similar in S-SWCNTs and polymers, with redshifted photoluminescence in films showing exciton migration. The transient photoinduced absorptions (PAs) in SWCNTs and

Paired electron crystal: Order from frustration in the quarter-filled band

\pi

Observation of three resonances in the third harmonic generation spectrum of conjugated polymers: Evidence for the four-level essential states model

-conjugated polymers are also remarkably similar, with a low energy PA

Evidence for excimer photoexcitations in an ordered π-conjugated polymer film

_1

Theory of interfacial charge-transfer complex photophysics in π -conjugated polymer-fullerene blends

and a higher energy PA

Absence of superconductivity in the half-filled band hubbard model on the anisotropic triangular lattice

_2

Theory of excited state absorptions in phenylene-based

in all cases. Theoretical calculations of excited state absorptions within a correlated