Enhanced electron mobility and high order fractional quantum Hall states in AlAs quantum wells

E. P. De Poortere; Y. P. Shkolnikov; E. Tutuc; S. J. Papadakis; M. Shayegan; E. Palm; T. Murphy

doi:10.1063/1.1456265

Enhanced electron mobility and high order fractional quantum Hall states in AlAs quantum wells

E. P. De Poortere, Y. P. Shkolnikov, E. Tutuc, S. J. Papadakis, M. Shayegan, E. Palm, T. Murphy

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Abstract

We report improvements in the quality of two-dimensional (2D) electrons in modulation-doped AlAs quantum wells, leading to electron mobilities as high as 31m²/Vs, a ten-fold increase over the mobility of previous AlAs samples. Confirming the quality of our quantum wells, developing fractional quantum Hall states are observed in the first Landau level at high order filling factors ν=2/5, 3/5, 3/7, 4/7, and 4/9, and at larger fillings, at ν=4/3, 5/3, 7/3, 8/3, 8/5, and 11/3. Thanks to the much larger effective mass and g factor of AlAs 2D electrons compared to GaAs, and to the possible multivalley occupancy of AlAs 2D electrons, our improved systems help bring a wider scope to the investigation of low-disorder, interacting 2D electrons.

Original language	English (US)
Pages (from-to)	1583-1585
Number of pages	3
Journal	Applied Physics Letters
Volume	80
Issue number	9
DOIs	https://doi.org/10.1063/1.1456265
State	Published - Mar 4 2002

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1456265

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title = "Enhanced electron mobility and high order fractional quantum Hall states in AlAs quantum wells",

abstract = "We report improvements in the quality of two-dimensional (2D) electrons in modulation-doped AlAs quantum wells, leading to electron mobilities as high as 31m2/Vs, a ten-fold increase over the mobility of previous AlAs samples. Confirming the quality of our quantum wells, developing fractional quantum Hall states are observed in the first Landau level at high order filling factors ν=2/5, 3/5, 3/7, 4/7, and 4/9, and at larger fillings, at ν=4/3, 5/3, 7/3, 8/3, 8/5, and 11/3. Thanks to the much larger effective mass and g factor of AlAs 2D electrons compared to GaAs, and to the possible multivalley occupancy of AlAs 2D electrons, our improved systems help bring a wider scope to the investigation of low-disorder, interacting 2D electrons.",

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AU - De Poortere, E. P.

AU - Shkolnikov, Y. P.

AU - Tutuc, E.

AU - Papadakis, S. J.

AU - Shayegan, M.

AU - Palm, E.

AU - Murphy, T.

PY - 2002/3/4

Y1 - 2002/3/4

N2 - We report improvements in the quality of two-dimensional (2D) electrons in modulation-doped AlAs quantum wells, leading to electron mobilities as high as 31m2/Vs, a ten-fold increase over the mobility of previous AlAs samples. Confirming the quality of our quantum wells, developing fractional quantum Hall states are observed in the first Landau level at high order filling factors ν=2/5, 3/5, 3/7, 4/7, and 4/9, and at larger fillings, at ν=4/3, 5/3, 7/3, 8/3, 8/5, and 11/3. Thanks to the much larger effective mass and g factor of AlAs 2D electrons compared to GaAs, and to the possible multivalley occupancy of AlAs 2D electrons, our improved systems help bring a wider scope to the investigation of low-disorder, interacting 2D electrons.

AB - We report improvements in the quality of two-dimensional (2D) electrons in modulation-doped AlAs quantum wells, leading to electron mobilities as high as 31m2/Vs, a ten-fold increase over the mobility of previous AlAs samples. Confirming the quality of our quantum wells, developing fractional quantum Hall states are observed in the first Landau level at high order filling factors ν=2/5, 3/5, 3/7, 4/7, and 4/9, and at larger fillings, at ν=4/3, 5/3, 7/3, 8/3, 8/5, and 11/3. Thanks to the much larger effective mass and g factor of AlAs 2D electrons compared to GaAs, and to the possible multivalley occupancy of AlAs 2D electrons, our improved systems help bring a wider scope to the investigation of low-disorder, interacting 2D electrons.

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Enhanced electron mobility and high order fractional quantum Hall states in AlAs quantum wells

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