We present measurements of S(1) exciton transport in (6,5) carbon nanotubes at room temperature in a colloidal environment. Exciton diffusion lengths associated with end quenching paired with photoluminescence lifetimes provide a direct basis for determining a median diffusion constant of approximately 7.5 cm(2)s(-1). Our experimental results are compared to model diffusion constants calculated...

Related Articles A possible mechanism to tune magneto-electroluminescence in organic light-emitting diodes through adjusting the triplet exciton density Appl. Phys. Lett. 99, 143305 (2011) A possible mechanism to tune magneto-electroluminescence in organic light-emitting diodes through adjusting the triplet exciton density APL: Org. Electron. Photonics 4, 211 (2011) Response to “Comment on ‘Exc...

To provide physical insight into the recently observed photoluminescence saturation behavior in singlewalled carbon nanotubes implying the existence of an upper limit of exciton densities, we have performed a time-dependent theoretical study of diffusion-limited exciton-exciton annihilation in the general context of reaction-diffusion processes, for which exact treatments exist. By including th...

We describe photonic crystal microcavities with very strong light-matter interaction to realize roomtemperature, equilibrium, exciton-polariton Bose-Einstein condensation (BEC). This goal is achieved through a careful balance between strong light trapping in a photonic band gap (PBG) and large exciton density enabled by a multiple quantum-well (QW) structure with a moderate dielectric constant....

Exciton binding energies of heavyand light-hole excitons affected by charge-carrier screening in GaAs-Al„Ga& As quantum wells are calculated by the variational-perturbation method. The exciton binding energies are found to decrease rapidly when the screening length is less than 30az (effective exciton Bohr radius). This screening length corresponds to a carrier density of 7.0X 10"/cm at T=10 K....

Exciton superfluid is a macroscopic quantum phenomenon in which large quantities of excitons undergo the Bose-Einstein condensation. Recently, exciton superfluid has been widely studied in various bilayer systems. However, experimental measurements only provide indirect evidence for the existence of exciton superfluid. In this article, by viewing the exciton in a bilayer system as an electric d...

Recent calculations on the formation of self-trapped amide group vibrational states in -helical polypeptides J. Chem. Phys. 124, 134907 2006 are extended to the amide N–H normal mode vibrations. First, the adiabatic N–H vibrational singleand two-exciton states are examined by treating the longitudinal chain coordinates as parameters. Then, in using the multiconfiguration time-dependent Hartree ...

We measure the optical-absorption spectra and optical conductivities of excitons and trions in monolayers of metal dichalcogenide MoS2 and compare the results with theoretical models. Our results show that the Wannier-Mott model for excitons with modifications to account for small exciton radii and large exciton relative wave function spread in momentum space, phase space blocking due to Pauli ...

We report quantum Monte Carlo calculations of biexciton binding energies in ideal two-dimensional bilayer systems with isotropic electron and hole masses. We have also calculated exciton-exciton interaction potentials and pair-distribution functions for electrons and holes in bound biexcitons. Comparing our data with results obtained in a recent study using a model exciton-exciton potential Sch...

Phonon sideband optical spectroscopy determines the energy of the dark K-momentum exciton for (6,5) carbon nanotubes. One-phonon sidebands appear in absorption and emission, split by two zone-boundary (K-point) phonons. Their average energy locates the E11 K-momentum exciton 36 meV above the E11 bright level, higher than available theoretical estimates. A model for exciton-phonon coupling shows...