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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
| 1 |
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Mattis, Daniel C. | Dynamics of quasiparticles in the two-dimensional Hubbard model | The Hubbard model at half-filling is a collective, antiferromagnetic insulator. We study added electrons or holes. The insulating energy gap and the dispersion of the added carriers are calculated variationally in two dimensions with use of a Monte Carlo evaluation of the electronic correlation f... | Dispersion; Electrons; Carriers | 1990 |
| 2 |
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Williams, Clayton C. | Lateral dopant profiling in MOS structures on a 100 nm scale using scanning capacitance microscopy | Scanning capacitance microscopy and atomic force microscopy have been used to image the extent of lateral dopant diffusion in MOS structures. The data are capacitance vs. voltage measurements made on a submicron scale. The technique is non-destructive when imaging uncleaved samples. New experim... | Scanning capacitance microscopy; Dopant profiling | 1990 |
| 3 |
 |
Ailion, David Charles | NMR determination of the Edwards-Anderson order parameter in the deuterated pseudo-spin glass Rb1-x(ND4)xD2PO4: anisotropy and concentration dependence of the ND4 deuteron second moment | We measured the rotationally averaged N D 4 + deuteron second moment in deuterated mixed single crystals Rb1_x(ND4 ) xD2P04 with x = 0.22, 0.44, 0.78, and pure ND4D2P04 . We found that the linewidths of the mixed systems show a strong dependence on the crystal's orientation with respect to the exter... | NMR; Crystals; Deuteron second moment; Anisotropy; Linewidth | 1990 |
| 4 |
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Vardeny, Zeev Valentine | Picosecond photomodulation study of nanocrystalline hydrogenated silicon | We have extended our photomodulation studies of nc-Si:H to the picosecond time domain. We measured the decays of photoinduced reflectivity with lOOfs temporal resolution as a function of. light intensity. Comparison with the data obtained on a-Si:H and c-Si indicates that ultrafast trapping and reco... | Picosecond photomodulation; Nanocrystalline silicon | 1990 |
| 5 |
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Vardeny, Zeev Valentine | Studies of picosecond carrier dynamics in polysilane alloys: evidence for geminate recombination in small hydrogenated amorphous silicon clusters | The ultrafast photocarrier dynamics in polysilane alloys amorphous (SiH2)n' has been studied using the picosecond photoinduced absorption (PA) technique. For excitation below the optical gap, the PA response decays exponentially and is faster at low temperatures. This is interpreted in terms of e-h ... | Picosecond carrier dynamics; Polysilane alloys; Geminate recombination; a-Si:H; Amorphous silicon; Ultrafast relaxation; Photoexcited carriers | 1990 |
| 6 |
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Vardeny, Zeev Valentine | Ultrafast electronic and acoustic effects in conducting polymers | The polarized picosecond pump and probe technique with 50 fsec resolution has been used to generate and detect electronic excitations and propagation of ultrasonic phonons in thin films of oriented and unoriented polyacetylene and polythiophene. We found that the photoexcitations are instantaneou... | Ultrafast electronic effects; Ultrafast acoustic effects; Polarized picosecond pump; Pump and probe technique; Ultrasonic phonons | 1990 |
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