Atomically precise superlattice potential imposed on a two-dimensional electron gas

H. L. Stormer; L. N. Pfeiffer; K. W. Baldwin; K. W. West; J. Spector

doi:10.1063/1.104528

Atomically precise superlattice potential imposed on a two-dimensional electron gas

H. L. Stormer, L. N. Pfeiffer, K. W. Baldwin, K. W. West, J. Spector

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Abstract

We have been able to fabricate a two-dimensional electron gas containing an atomically precise, lateral Kronig-Penney potential of 102 Å periodicity. The structure was formed by modulation-doped molecular beam epitaxy overgrowth on the cleaved edge of a 71 Å GaAs/31 Å AlGaAs compositional superlattice. Low-temperature magnetotransport reveals clear quantum Hall characteristics. From the onset of the Shubnikov-de Haas oscillations at 0.25 T we deduce a lower limit of the mobility of μ≳40 000 cm²/V s at an electron density of 3.0×10¹¹ cm^-2 and infer that the carriers are crossing more than 200 GaAs/AlGaAs interfaces without losing phase coherence.

Original language	English (US)
Pages (from-to)	726-728
Number of pages	3
Journal	Applied Physics Letters
Volume	58
Issue number	7
DOIs	https://doi.org/10.1063/1.104528
State	Published - 1991
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.104528

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title = "Atomically precise superlattice potential imposed on a two-dimensional electron gas",

abstract = "We have been able to fabricate a two-dimensional electron gas containing an atomically precise, lateral Kronig-Penney potential of 102 {\AA} periodicity. The structure was formed by modulation-doped molecular beam epitaxy overgrowth on the cleaved edge of a 71 {\AA} GaAs/31 {\AA} AlGaAs compositional superlattice. Low-temperature magnetotransport reveals clear quantum Hall characteristics. From the onset of the Shubnikov-de Haas oscillations at 0.25 T we deduce a lower limit of the mobility of μ≳40 000 cm2/V s at an electron density of 3.0×1011 cm-2 and infer that the carriers are crossing more than 200 GaAs/AlGaAs interfaces without losing phase coherence.",

author = "Stormer, {H. L.} and Pfeiffer, {L. N.} and Baldwin, {K. W.} and West, {K. W.} and J. Spector",

year = "1991",

doi = "10.1063/1.104528",

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T1 - Atomically precise superlattice potential imposed on a two-dimensional electron gas

AU - Stormer, H. L.

AU - Pfeiffer, L. N.

AU - Baldwin, K. W.

AU - West, K. W.

AU - Spector, J.

PY - 1991

Y1 - 1991

N2 - We have been able to fabricate a two-dimensional electron gas containing an atomically precise, lateral Kronig-Penney potential of 102 Å periodicity. The structure was formed by modulation-doped molecular beam epitaxy overgrowth on the cleaved edge of a 71 Å GaAs/31 Å AlGaAs compositional superlattice. Low-temperature magnetotransport reveals clear quantum Hall characteristics. From the onset of the Shubnikov-de Haas oscillations at 0.25 T we deduce a lower limit of the mobility of μ≳40 000 cm2/V s at an electron density of 3.0×1011 cm-2 and infer that the carriers are crossing more than 200 GaAs/AlGaAs interfaces without losing phase coherence.

AB - We have been able to fabricate a two-dimensional electron gas containing an atomically precise, lateral Kronig-Penney potential of 102 Å periodicity. The structure was formed by modulation-doped molecular beam epitaxy overgrowth on the cleaved edge of a 71 Å GaAs/31 Å AlGaAs compositional superlattice. Low-temperature magnetotransport reveals clear quantum Hall characteristics. From the onset of the Shubnikov-de Haas oscillations at 0.25 T we deduce a lower limit of the mobility of μ≳40 000 cm2/V s at an electron density of 3.0×1011 cm-2 and infer that the carriers are crossing more than 200 GaAs/AlGaAs interfaces without losing phase coherence.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Atomically precise superlattice potential imposed on a two-dimensional electron gas

Abstract

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