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Autor:
Chiu, YenTing, Padmanabhan, Medini, Gokmen, T., Shabani, J., Tutuc, E., Shayegan, M., Winkler, R.
Publikováno v:
Phys. Rev. B 84, 155459 (2011)
We report effective hole mass ($m^{*}$) measurements through analyzing the temperature dependence of Shubnikov-de Haas oscillations in dilute (density $p \sim 7 \times 10^{10}$ cm$^{-2}$, $r_{s} \sim 6$) two-dimensional (2D) hole systems confined to
Externí odkaz:
http://arxiv.org/abs/1106.4608
Publikováno v:
Nature Phys.6:621-624,2010
When interacting two-dimensional electrons are placed in a large perpendicular magnetic field, to minimize their energy, they capture an even number of flux quanta and create new particles called composite fermions (CFs). These complex electron-flux-
Externí odkaz:
http://arxiv.org/abs/1009.5732
Publikováno v:
Solid State Communications 150, 1165 (2010)
We report transport measurements of composite Fermions at filling factor $\nu=3/2$ in AlAs quantum wells as a function of strain and temperature. In this system the composite Fermions possess a valley degree of freedom and show piezoresistance qualit
Externí odkaz:
http://arxiv.org/abs/1008.2566
Publikováno v:
Phys. Rev. B 81, 235305 (2010)
We measure the renormalized effective mass (m*) of interacting two-dimensional electrons confined to an AlAs quantum well while we control their distribution between two spin and two valley subbands. We observe a marked contrast between the spin and
Externí odkaz:
http://arxiv.org/abs/1008.2536
Publikováno v:
Phys. Rev. Lett. 104, 016805 (2010)
We study a two-dimensional electron system where the electrons occupy two conduction band valleys with anisotropic Fermi contours and strain-tunable occupation. We observe persistent quantum Hall states at filling factors $\nu = 1/3$ and 5/3 even at
Externí odkaz:
http://arxiv.org/abs/1001.1290
Publikováno v:
Phys. Rev. Lett. 103, 256802 (2009)
We report the observation of developing fractional quantum Hall states at Landau level filling factors $\nu = 1/2$ and 1/4 in electron systems confined to wide GaAs quantum wells with significantly $asymmetric$ charge distributions. The very large el
Externí odkaz:
http://arxiv.org/abs/0909.2262
Publikováno v:
Phys. Rev. B 80, 035423 (2009)
In two-dimensional electron systems confined to wide AlAs quantum wells, composite fermions around the filling factor $\nu$ = 3/2 are fully spin polarized but possess a valley degree of freedom. Here we measure the energy needed to completely valley
Externí odkaz:
http://arxiv.org/abs/0907.0508
Publikováno v:
Phys. Rev. B. 79, 195311 (2009)
We measure the effective mass (m*) of interacting two-dimensional electrons confined to a 4.5 nm-wide AlAs quantum well. The electrons in this well occupy a single out-of-plane conduction band valley with an isotropic in-plane Fermi contour. When the
Externí odkaz:
http://arxiv.org/abs/0905.0658
Publikováno v:
Phys. Rev. Lett. 103 046805 (2009)
Magneto-transport measurements on electrons confined to a 57 nm-wide, GaAs quantum well reveal that the correlated electron states at low Landau level fillings ($\nu$) display a remarkable dependence on the symmetry of the electron charge distributio
Externí odkaz:
http://arxiv.org/abs/0905.0032