UScholar Works
 
Filters: Journal Title: "Physical Review Letters" Collection: "ir_uspace"
1 - 25 of 9
Number of results to display per page
CreatorTitleDescriptionSubjectDate
1 Mishchenko, EugeneEffect of electron-electron interactions on the conductivity of clean grapheneMinimal conductivity of a single undoped graphene layer is known to be of the order of the conductance quantum, independent of the electron velocity. We show that this universality does not survive electron-electron interaction, which results in nontrivial frequency dependence. We begin with analyzi...Optical conductivity; Perturbation theory2007-05
2 Liu, FengMechanism for nanotube formation from self-bending nanofilms driven by atomic-scale surface-stress imbalanceWe demonstrate, by theoretical analysis and molecular dynamics simulation, a mechanism for fabricating nanotubes by self-bending of nanofilms under intrinsic surface-stress imbalance due to surface reconstruction. A freestanding Si nanofilm may spontaneously bend itself into a nanotube without exter...Nanotube formation; Self-bending nanofilms; Surface-stress imbalance2007-04
3 Vardeny, Zeev Valentine; Ehrenfreund, Eitan A.Polaron spin-lattice relaxation time in ∏-conjugated polymers from optically detected magnetic resonanceWe describe a method for obtaining the polaron spin-lattice relaxation time TSL in ∏-conjugated polymers by measuring the optically detected magnetic resonance (ODMR) dynamics as a function of microwave power and laser intensity. The peculiar ODMR dynamics is well described by a spin dependent re...pi-conjugated polymers; Optically detected magnetic resonance; ODMR; MEH-PPV2007-10
4 Boehme, ChristophRoom temperature electrical detection of spin coherence in C60An experimental demonstration of electrical detection of coherent spin motion of weakly coupled, localized electron spins in thin fullerene C60 films at room temperature is presented. Pulsed electrically detected magnetic resonance experiments on vertical photocurrents through Al/C60/ZnO samples sh...Spin coherence2007-05
5 Lupton, John MarkRoom-temperature exciton storage in elongated semiconductor nanocrystalsThe excited state of colloidal nanoheterostructures consisting of a spherical CdSe nanocrystal with an epitaxially attached CdS rod can be perturbed effectively by electric fields. Field-induced fluorescence quenching coincides with a conversion of the excited state species from the bright exciton ...Exciton storage; Colloidal nanoheterostructures; CdSe nanocrystal2007-01
6 Lupton, John MarkSimultaneous Raman and fluorescence spectroscopy of single conjugated polymer chainsSimultaneous surface enhanced Raman scattering (SERS) and fluorescence is demonstrated from single conjugated polymer chains. As resonance enhancement of SERS depends on the spectral overlap of the polymer's absorption and the incident laser, resonance Raman and fluorescence effectively probe the ab...Surface enhanced Raman scattering; SERS; Resonance enhancement2007-03
7 Mishchenko, Eugene; Raikh, Mikhail E.Smearing of the two-dimensional Kohn anomaly in a nonquantizing magnetic field: implications for interaction effectsThermodynamic and transport characteristics of a clean two-dimensional interacting electron gas are shown to be sensitive to the weak perpendicular magnetic field even at temperatures much higher than the cyclotron energy, when the quantum oscillations are completely washed out. We demonstrate this ...Kohn anomaly; Tunnel density of states2007-07
8 Mishchenko, EugeneSpin Hall edge spin polarization in a ballistic 2D electron systemUniversal properties of the spin Hall effect in ballistic 2D electron systems are addressed. The net spin polarization across the edge of the conductor is second order, ~λ2, in spin-orbit coupling constant independent of the form of the boundary potential, with the contributions of normal and evan...Spin- Hall effect2007-09
9 Mishchenko, Eugene; Raikh, Mikhail E.Zero-bias tunneling anomaly in a clean 2D electron gas caused by smooth density variationsWe show that smooth variations, δn(r), of the local electron concentration in a clean 2D electron gas give rise to a zero-bias anomaly in the tunnel density of states, v(ω), even in the absence of scatterers, and thus, without the Friedel oscillations. The energy width, ω0, of the anomaly scale...Tunnel density of states; Disordered metals2007-11
1 - 25 of 9