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14 papers · 1 filter
Multi-terminal spin-dependent transport in ballistic carbon nanotubes
Audrey Cottet, Chéryl Feuillet-Palma, Takis Kontos
We study theoretically nonlocal spin transport in a ballistic carbon nanotube contacted to two ferromagnetic leads and two normal-metal leads. When the magnetizations of the two fe…
Fractional quantum Hall state at ν=1/4 in a wide quantum well
Z. Papic, G. Moller, M. V. Milovanovic +2
We investigate, with the help of Monte-Carlo and exact-diagonalization calculations in the spherical geometry, several compressible and incompressible candidate wave functions for…
Theoretical expectations for a fractional quantum Hall effect in graphene
Z. Papić, M. O. Goerbig, N. Regnault
Due to its fourfold spin-valley degeneracy, graphene in a strong magnetic field may be viewed as a four-component quantum Hall system. We investigate the consequences of this parti…
Observation of inter-Landau-level quantum coherence in semiconductor quantum wells
K. M. Dani, I. A. Cotoros, J. Wang +4
Using three-pulse four-wave-mixing femtosecond spectroscopy, we excite a non-radiative coherence between the discrete Landau levels of an undoped quantum well and study its dynamic…
Finite frequency noise of a superconductor/ferromagnet quantum point contact
Audrey Cottet, Benoit Doucot, Wolfgang Belzig
We have calculated the finite-frequency current noise of a superconductor-ferromagnet quantum point contact (SF QPC). This signal is qualitatively affected by the spin-dependence o…
Current noise through a Kondo quantum dot in a SU(N) Fermi liquid state
Christophe Mora, Xavier Leyronas, Nicolas Regnault
The current noise through a mesoscopic quantum dot is calculated and analyzed in the Fermi liquid regime of the SU(N) Kondo model. Results connect the Johnson-Nyquist noise to the…