## Abstract

We report effective mass enhancement of two-dimensional (2D) electrons in an atomically precise one-dimensional AlGaAs/GaAs superlattice potential fabricated by the cleaved-edge overgrowth technique. Magnetotransport measurements reveal that the mobility of the 2D electrons increases with electron density n_{2D}. At low densities (n_{2D}∼1.3×10^{11} cm^{-2}), the effective mass m* of the 2D electrons is 0.14 m_{e}, where m_{e} is the free-electron mass. This value of 0.14 m_{e} is twice the effective mass of electrons in GaAs (0.067 m_{e}). m* increases with n_{2D} and is ∼0.16 m_{e} at 2.7×10^{11} cm^{-2}. We explain these results based on the formation of energy minibands along the superlattice direction. The electron scattering time τ is calculated from the mobility and effective mass data. At 0.3 K, τ increases with n_{2D} from 5 to 11 ps as n_{2D} is varied from 1.1×10^{11} to 2.7×10^{11} cm^{-2}.

Original language | English (US) |
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Pages (from-to) | 3600-3602 |

Number of pages | 3 |

Journal | Applied Physics Letters |

Volume | 76 |

Issue number | 24 |

DOIs | |

State | Published - Jun 12 2000 |

Externally published | Yes |

## All Science Journal Classification (ASJC) codes

- Physics and Astronomy (miscellaneous)