Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Brian S. Dennis"'
Publikováno v:
Physica C: Superconductivity. 456:75-82
Electronic Raman scattering studies on MgB2 single crystals as a function of excitation and polarization have revealed three distinct superconducting features: a clean gap below 37 cm-1 and two coherence peaks at 109 cm-1 and 78 cm-1 which we identif
Autor:
David A. Czaplewski, Brian S. Dennis, D.O. Lopez, Michael I. Haftel, Girsh Blumberg, Vladimir A. Aksyuk
Publikováno v:
Optics express. 23(17)
Passive optical elements can play key roles in photonic applications such as plasmonic integrated circuits. Here we experimentally demonstrate passive gap-plasmon focusing and routing in two-dimensions. This is accomplished using a high numerical-ape
Autor:
Aron Pinczuk, Loren Pfeiffer, Stefano Luin, Brian S. Dennis, Ken W. West, Vittorio Pellegrini
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 34:244-247
We report inelastic light scattering measurements of spin excitations on coupled electron bilayers with relatively large tunneling gaps at total filling factor nu(T) = 1. We show that the pseudospin polarization order parameter, where the pseudospin
Autor:
Cyrus F. Hirjibehedin, Brian S. Dennis, Stefano Luin, Aron Pinczuk, Irene Dujovne, Vittorio Pellegrini, Ken W. West, L. N. Pfeiffer
Publikováno v:
Solid State Communications. 135:645-653
Strongly-correlated two-dimensional (2D) electron fluids occur in artificial semiconductor heterostructures of high perfection that are subjected to quantizing magnetic fields. Under conditions of high magnetic fields, low temperatures in the millike
Publikováno v:
Solid State Communications. 125:149-153
Coulomb interactions in a dilute one-dimensional (1D) electron system in high quality cleaved-edge overgrown GaAs quantum wires are probed by optics experiments. Intra-subband collective excitation modes are observed in resonant inelastic light-scatt
Autor:
L. N. Pfeiffer, A. Pinczuk, Cyrus F. Hirjibehedin, Brian S. Dennis, Annette S. Plaut, Ken W. West
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 12:539-542
We have investigated the photoluminescence (PL) and inelastic light-scattering spectra of dilute two-dimensional (2D) hole gases of ultra-high mobility. The samples were GaAs–Al x Ga 1− x As (3 1 1) A quantum structures, modulation-doped with Si.
Autor:
Brian S. Dennis, A. Pinczuk, C. Pascual, J. M. Calleja, L. N. Pfeiffer, Ken W. West, J. Rubio
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 12:722-725
Cleaved-edge overgrown semiconductor quantum wires containing a one-dimensional electron gas with few occupied subbands are probed by optical experiments. Inter-sub-band excitation modes are observed by resonant inelastic light scattering at energies
Publikováno v:
Physica E: Low-dimensional Systems and Nanostructures. 12:55-58
Magnetorotons in the dispersion curves of collective gap excitation modes of fractional quantum Hall liquids are measured by resonant inelastic light scattering. Two deep magnetoroton minima are observed at ν=25, while a single deep minimum is resol
Autor:
Harold U. Baranger, Marzena H. Szymańska, Brian S. Dennis, Ken W. West, Jaime Rubio, Loren Pfeiffer, Song He, Peter B. Littlewood, Aron Pinczuk
Publikováno v:
Solid State Communications. 120:423-427
We report that excitonic lasing gain coexists with spontaneous optical emission characteristic of an electron–hole plasma in highly photoexcited one-dimensional semiconductors. The experiments probe quantum T-wire laser structures optimized for hig
Publikováno v:
Physical Review Letters. 86:2637-2640
Magnetorotons in the dispersions of collective gap excitation modes of fractional quantum Hall liquids are measured in resonant inelastic light scattering experiments. Two deep magnetoroton minima are observed at $\ensuremath{\nu}\phantom{\rule{0ex}{