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Observation of Anomalous Phonon Softening in Bilayer Graphene
Jun Yan, Erik A. Henriksen, Philip Kim +1
The interaction of electron-hole pairs with lattice vibrations exhibits a wealth of intriguing physical phenomena. The Kohn anomaly is a renowned example where electron-phonon coup…
Spin-texture and magneto-roton excitations at nu=1/3
Javier G. Groshaus, Irene Dujovne, Yann Gallais +7
Neutral spin texture ST excitations at nu=1/3 are directly observed for the first time by resonant inelastic light scattering. They are determined to involve two simultaneous spin-…
Soft Spin Wave Near nu=1: Evidence for a Magnetic Instability in Skyrmion Systems
Y. Gallais, J. Yan, A. Pinczuk +2
The ground state of the two dimensional electron gas near =1 is investigated by inelastic light scattering measurements carried down to very low temperatures. Away from =1, t…
Control of optical emission in doped GaAs/AlGaAs nanofabricated quantum dots
Sokratis Kalliakos, Cesar Pascual Garcia, Vittorio Pellegrini +8
Dilute arrays of GaAs/AlGaAs modulation-doped quantum dots (QDs) fabricated by electron-beam lithography and low impact reactive-ion etching exhibit highly homogeneous luminescence…
Metamorphosis of a Quantum Hall Bilayer State into a Composite Fermion Metal
Biswajit Karmakar, Stefano Luin, Vittorio Pellegrini +4
Composite fermion metal states emerge in quantum Hall bilayers at total Landau level filling factor =1 when the tunneling gap collapses by application of in-plane components o…
The Fermi edge singularity of spin polarized electrons
P. Plochocka-Polack, J. G. Groshaus, M. Rappaport +4
We study the absorption spectrum of a two-dimensional electron gas (2DEG) in a magnetic field. We find that that at low temperatures, when the 2DEG is spin polarized, the absorptio…