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Alloy disorder modulated electron transport at Mg_xZn_(1-x)O/ZnO heterointerface

Vishnuradhan, Aswin and Kozuka, Y. and Uchida, M. and Falson, J. and Tsukazaki, A. and Kawasaki, M. (2017) Alloy disorder modulated electron transport at Mg_xZn_(1-x)O/ZnO heterointerface. AIP Advances, 7 (1). Art. No. 015029. ISSN 2158-3226. doi:10.1063/1.4974462.

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High-mobility electron systems in two dimensions have been the platform for realizing many fascinating quantum phenomena at low temperatures. Continuous demand to improve the sample quality has necessitated the investigations of various disorders influencing the quantum transport. Here, we study the effect of short-ranged alloy disorder on the scattering of two-dimensional electron system in Mg_xZn_(1-x)O/ZnO. For this purpose, we employ a modified interface profile consisting of Mg_(0.01)Zn_(0.99)O/ZnO with a thin (2nm) Mg_xZn_(1-x)O interlayer with x ranging from 0.005 to 0.4. This interlayer design allows us to investigate scattering mechanisms at a nearly constant carrier density as the interlayer is found not to significantly affect the carrier density but enhance alloy disorder. While the transport scattering time (τ_(tr)) shows a strong correlation with x, the quantum scattering time (τ_q) remains insensitive to x. The large variation in the τ_(tr)/τ_q ratio (from 16.2 to 1.5 corresponding to x from 0.005 to 0.4) implies a change in the dominant scattering mechanism from long range towards short range with increasing x. The insensitivity of τq on x indicates the scattering rate is not dominated by the alloy disorder. This implies that other scattering mechanisms, likely unintentional background impurities or remote surface disorders, are dominant in limiting τ_q, and therefore providing a prospect for pursuing ever higher levels in the quality of the two-dimensional electron system in Mg_xZn_(1-x)O/ZnO system.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kozuka, Y.0000-0001-7674-600X
Uchida, M.0000-0002-0735-8844
Falson, J.0000-0003-3183-9864
Tsukazaki, A.0000-0003-0251-063X
Kawasaki, M.0000-0001-6397-4812
Additional Information:© 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license ( (Received 22 November 2016; accepted 5 January 2017; published online 18 January 2017) We thank D. Maryenko for his helpful comments. This work was partly supported by Grant-in-Aids for Scientific Research (S) No. 24226002 from MEXT, Japan.
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Ministry of Education, Culture, Sports, Science and Technology (MEXT)24226002
Issue or Number:1
Record Number:CaltechAUTHORS:20200402-144732967
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102287
Deposited By: George Porter
Deposited On:03 Apr 2020 14:03
Last Modified:16 Nov 2021 18:10

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