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Novel Probes of Topological Phases of Electrons Aron Pinczuk , Columbia University, DMR 0803691

Novel Probes of Topological Phases of Electrons Aron Pinczuk , Columbia University, DMR 0803691.

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Novel Probes of Topological Phases of Electrons Aron Pinczuk , Columbia University, DMR 0803691

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  1. Novel Probes of Topological Phases of Electrons AronPinczuk, Columbia University, DMR 0803691 The electron fluids in the fractional quantum Hall effect are benchmarks of topological phases of matter. Our work reveals that these phases have characteristic low lying excitations from emergent quasiparticles. The studies of the excitations offer unique insights on the topological quantum fluids (1) Phases of of 2D electron systems in ground (N=0) and higher (N=1,2) Landau levels are studied[1-4]. At Landau level filling =5/2 (see figure and notes) we uncovered a spin polarized phase that occurs in coexistence with phases seemingly lacking full spin polarization. The polarized phase could be a paired composite fermion (CF) phase that supports non-Abelian states proposed for topological quantum computation. [1] T.D. Rhone et al, Phys. Rev. Lett., 106, 096803 (2011). [2] T.D. Rhone et al, Phys. Rev. Lett., 106, 196805 (2011). [3] U. Wurstbauer et al, Phys. Rev. Lett. 107, 066804 (2011). [4] U. Wurstbauer et al. work in progress paired CF phase stripephase bubblephase (2) laser (1) Inelastic light scattering spectra for two laser photon energies EL. A phase of a low-lying continuum (grey) coexists with a spin-polarized displaying a well-defined spin-wave mode (blue) at the Zeeman energy EZ. (2) Illustration of different quantum phases that could contribute to spectra in Fig. 1. The lakes of phases shown have dimension smaller than the size of the spot of the laser beam on the GaAs structure studied.

  2. Trevor D. Rhone Novel Probes of Topological Phases of Electrons AronPinczuk, Columbia University, DMR 0803691 Impact: Studies of electron fluids in quantum structures reveal new properties with impact on major research areas of contemporary science . The studied materials could eventually be established as basis for future electronic device technologies. Education One Columbia pos-doc (Ursula Wurstbauer), and one Columbia graduate student (Trevor D. Rhone,) are currently the leaders in the research supported by this NSF award. This year two undergraduate students (Albert Rigosi and Dov Fields) actively participated in the programs. The projects benefits from collaborations with Loren Pfeiffer (Princeton) and with numerous colleagues an major research centers at Columbia. Collaborations abroad are in Pisa, Italy (group of Vittorio Pellegrini), Chernogolovka, Russia (group of Igor Kukushkin) and Paris, France (YannGallais). The participants explore frontiers of quantum physics and materials science and are being trained in ultra-low temperature techniques, semiconductor physics, material processing and clean-room methods. Networking with major centers in the US and abroad enhance the impact of the research. Albert Rigosi Ursula Wurstbauer Dov Fields

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