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Quantized conductance of one-dimensional strongly correlated electrons in an oxide heterostructure

Hou, H. and Kozuka, Y. and Liao, Jun-Wei and Smith, L. W. and Kos, D. and Griffiths, J. P. and Falson, J. and Tsukazaki, A. and Kawasaki, M. and Ford, C. J. B. (2019) Quantized conductance of one-dimensional strongly correlated electrons in an oxide heterostructure. Physical Review B, 99 (12). Art. No. 121302(R). ISSN 2469-9950.

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Oxide heterostructures are versatile platforms with which to research and create novel functional nanostructures. We successfully develop one-dimensional (1D) quantum-wire devices using quantum point contacts on MgZnO/ZnO heterostructures and observe ballistic electron transport with conductance quantized in units of 2e²/ℎ. Using dc-bias and in-plane field measurements, we find that the g factor is enhanced to around 6.8, more than three times the value in bulk ZnO. We show that the effective mass m^∗ increases as the electron density decreases, resulting from the strong electron-electron interactions. In this strongly interacting 1D system we study features matching the “0.7” conductance anomalies up to the fifth subband. This Rapid Communication demonstrates that high-mobility oxide heterostructures such as this can provide good alternatives to conventional III-V semiconductors in spintronics and quantum computing as they do not have their unavoidable dephasing from nuclear spins. This paves a way for the development of qubits benefiting from the low defects of an undoped heterostructure together with the long spin lifetimes achievable in silicon.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kozuka, Y.0000-0001-7674-600X
Falson, J.0000-0003-3183-9864
Tsukazaki, A.0000-0003-0251-063X
Kawasaki, M.0000-0001-6397-4812
Alternate Title:Quantised conductance of one-dimensional strongly-correlated electrons in an oxide heterostructure
Additional Information:© 2019 American Physical Society. (Received 5 July 2018; revised manuscript received 3 March 2019; published 25 March 2019) We thank S. Holmes for helpful discussions. H.H. acknowledges the Chinese Scholarship Council and Cambridge Trust for financial support. This work was partly supported by JST, PRESTO Grant No. JPMJPR1763 and JST, CREST Grant No. JPMJCR16F1, Japan.
Funding AgencyGrant Number
Chinese Scholarship CouncilUNSPECIFIED
Cambridge Overseas TrustUNSPECIFIED
Japan Science and Technology AgencyJPMJPR1763
Japan Science and Technology AgencyJPMJCR16F1
Issue or Number:12
Record Number:CaltechAUTHORS:20200402-144732429
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102282
Deposited By: George Porter
Deposited On:03 Apr 2020 16:29
Last Modified:03 Apr 2020 23:45

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