TY - JOUR
T1 - Multivalley two-dimensional electron system in an AlAs quantum well with mobility exceeding 2×106 cm2 V-1 s-1
AU - Chung, Yoon Jang
AU - Villegas Rosales, K. A.
AU - Deng, H.
AU - Baldwin, K. W.
AU - West, K. W.
AU - Shayegan, M.
AU - Pfeiffer, L. N.
N1 - Funding Information:
We acknowledge support through the NSF (Grants DMR 1709076 and ECCS 1508925) for measurements, and the NSF (Grant MRSEC DMR 1420541), the Gordon and Betty Moore Foundation (Grant GBMF4420), and the Department of Energy Basic Energy Sciences (DEFG02-00-ER45841) for sample fabrication and characterization.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/7/2
Y1 - 2018/7/2
N2 - Degenerate conduction-band minima, or "valleys", in materials such as Si, AlAs, graphene, and MoS2 allow them to host two-dimensional electron systems (2DESs) that can access a valley degree of freedom. These multivalley 2DESs present exciting opportunities for both pragmatic and fundamental research alike because not only are they a platform for valleytronic devices, but they also provide a tool to tune and investigate the properties of complex many-body ground states. Here, we report ultra-high-quality, modulation-doped AlAs quantum wells containing 2DESs that occupy two anisotropic valleys and have electron mobilities peaking at 2.4×106cm2V-1s-1 at a density of 2.2×1011cm-2. This is more than an order of magnitude improvement in mobility over previous results. The unprecedented quality of our samples is demonstrated by magneto-transport data that show high-order fractional quantum Hall minima up to the Landau level filling ν=8/17, and even the elusive ν=1/5 quantum Hall state.
AB - Degenerate conduction-band minima, or "valleys", in materials such as Si, AlAs, graphene, and MoS2 allow them to host two-dimensional electron systems (2DESs) that can access a valley degree of freedom. These multivalley 2DESs present exciting opportunities for both pragmatic and fundamental research alike because not only are they a platform for valleytronic devices, but they also provide a tool to tune and investigate the properties of complex many-body ground states. Here, we report ultra-high-quality, modulation-doped AlAs quantum wells containing 2DESs that occupy two anisotropic valleys and have electron mobilities peaking at 2.4×106cm2V-1s-1 at a density of 2.2×1011cm-2. This is more than an order of magnitude improvement in mobility over previous results. The unprecedented quality of our samples is demonstrated by magneto-transport data that show high-order fractional quantum Hall minima up to the Landau level filling ν=8/17, and even the elusive ν=1/5 quantum Hall state.
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U2 - 10.1103/PhysRevMaterials.2.071001
DO - 10.1103/PhysRevMaterials.2.071001
M3 - Article
AN - SCOPUS:85059488360
SN - 2475-9953
VL - 2
JO - Physical Review Materials
JF - Physical Review Materials
IS - 7
M1 - 071001
ER -