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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
 | Miller, Joel Steven | 1H NMR investigation of the magnetic spin configuration in the molecule-based ferrimagnet [MnTFPP][TCNE] | 1H NMR line-shape measurements have been performed in the linear chain molecule-based ferrimagnet [MnTFPP][TCNE].xPhMe (TFPP=tetrakis(4-fluorophenyl)porphinato; TCNE=tetracyanoethylene) as a function of temperature. Hyperfine shifts of opposite sign were observed indicating the presence of two oppo... | Magnetization; Magnets; Paramagnetic | 2002 |
| 2 |
 | Wu, Yong-Shi | Deformed Hubbard operator, bosonization, and phase diagram of the one-dimensional t-J model | We present an analytic study of the phase diagram of the one-dimensional t-J model and a couple of its cousins. To deal with the interactions induced by the no double occupancy constraints, we introduce a deformation of the Hubbard operators. When the deformation parameter ∆ is small, the induced... | Hubbard operator; Bosonization; Deformation; t-J model | 2002-10 |
| 3 |
 | Vardeny, Zeev Valentine | Excited-state relaxation in ∏-conjugated polymers | We study ultrafast relaxation processes of odd- (Bu) and even-parity (Ag) exciton states in poly(p-phenylene vinylene) derivatives. The Bu states are studied using a regular two-beam pump-and-probe spectroscopy, which can monitor vibronic relaxation and exciton diffusion. In order to observe the A... | Ultrafast relaxation; Excited-state relaxation; pi-conjugated polymers; PPV | 2002-05 |
| 4 |
 | Lupton, John Mark | Nonequilibrium polariton dynamics in organic microcavities | Microcavities containing a J-aggregate forming organic dye were prepared in the strong-coupling regime. Changing the position of the neat organic films within the microcavity allows a tuning of the giant Rabi splitting observed. We set the Rabi splitting to 25 meV and study the thermal activation o... | Nonequilibrium polariton dynamics; Organic microcavities; Optical microcavities; Rabi splitting; Light-matter interactions; Arrhenius activation | 2002-08 |
| 5 |
 | Lupton, John Mark | Origin of spectral broadening in amorphous π-conjugated amorphous semiconductors | We present a study of the picosecond fluorescence dynamics of p-conjugated semiconducting organic dendrimers in the solid state. By varying the degree of branching within the dendrons, referred to as the dendrimer generation, a control of intermolecular spacing of the emissive core and therefore o... | pi-conjugated polymers; pi-conjugated semiconductors; Spectral broadening; Solid state; Picosecond fluorescence dynamics | 2002-10 |
| 6 |
 | Vardeny, Zeev Valentine | Photophysics of pristine and C60-doped disubstituted polyacetylene | Using a variety of steady-state spectroscopies we studied the long-lived photoexcitations and electronic excited states of poly disubstituted acetylene (PDPA-nBu), the backbone structure of which is a disubstituted trans-polyacetylene, as well as PDPA-nBu/C60 blends. The cw spectroscopies include a... | Photophysics; Pristine disubstituted polyacetylene; C60-doped disubstituted polyacetylene; pi-conjugated polymers; Photoexcitations; Electronic excited states | 2002-08 |
| 7 |
 | Vardeny, Zeev Valentine | Spin-dependent delayed luminescence from nongeminate pairs of polarons in ∏-conjugated polymers | We measured cw photoinduced absorption (PA) and spin- 1 2 PA- and photoluminescence detected magnetic resonance (PADMR and PLDMR, respectively) in films of two representative p-conjugated polymers; poly(phenylene-vinylene) and polythiophene. From the dependences of the polaron PA and PLDMR on the ... | pi-conjugated polymers; Nongeminate pairs; Spin-dependent delayed luminescence; Photoinduced absorption; Poly(phenylene-vinylene) | 2002-12 |
| 8 |
 | Lupton, John Mark | Time-gated electroluminescence spectroscopy of polymer light-emitting diodes as a probe of carrier dynamics and trapping | We present time-gated electroluminescence (EL) spectroscopy of a polyfluorene-based conjugated polymer. The technique is shown to be sensitive enough to pick out impurity emission orders of magnitude weaker than the cw emission. By considering the temperature dependence of the delayed emission spect... | Time-gated electroluminescence spectroscopy; Carrier dynamics; Trapping; Delayed emission | 2002-04 |
| 9 |
 | Mishchenko, Eugene | Zero-bias anomaly in two-dimensional electron layers and multiwall nanotubes | The zero-bias anomaly in the dependence of the tunneling density of states n (e) on the energy e of the tunneling particle for two- and one-dimensional multilayered structures is studied. We show that for a ballistic two-dimensional (2D) system the first-order interaction correction to density of s... | Spin-orbit coupling; Coulomb interaction | 2002-05 |
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