Double quantum dots (DQDs) hold great promise as building blocks for quantum technology as they allow for two electronic states to coherently couple. Defining QDs with materials rather than using electrostatic gating allows for QDs with a hard-wall confinement potential and more robust charge and spin states. An unresolved problem is how to individually address these QDs, which is necessary for controlling quantum states. We here report the fabrication of DQD devices defined by the conduction band edge offset at the interface of the wurtzite and zinc blende crystal phases of InAs in nanowires. By using sacrificial epitaxial GaSb markers selectively forming on one crystal phase, we are able to precisely align gate electrodes allowing us to probe and control each QD independently. We hence observe textbooklike charge stability diagrams, a discrete energy spectrum, and electron numbers consistent with theoretical estimates and investigate the tunability of the devices, finding that changing the electron number can be used to tune the tunnel barrier as expected by simple band diagram arguments.
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Individually addressable double quantum dots formed with nanowire polytypes and identified by epitaxial markers
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6 May 2019
Research Article|
May 06 2019
Individually addressable double quantum dots formed with nanowire polytypes and identified by epitaxial markers
D. Barker
;
D. Barker
a)
NanoLund and Solid State Physics, Lund University
, Box 118, 22100 Lund, Sweden
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S. Lehmann;
S. Lehmann
NanoLund and Solid State Physics, Lund University
, Box 118, 22100 Lund, Sweden
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L. Namazi;
L. Namazi
NanoLund and Solid State Physics, Lund University
, Box 118, 22100 Lund, Sweden
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M. Nilsson;
M. Nilsson
NanoLund and Solid State Physics, Lund University
, Box 118, 22100 Lund, Sweden
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C. Thelander;
C. Thelander
NanoLund and Solid State Physics, Lund University
, Box 118, 22100 Lund, Sweden
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K. A. Dick;
K. A. Dick
b)
NanoLund and Solid State Physics, Lund University
, Box 118, 22100 Lund, Sweden
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V. F. Maisi
V. F. Maisi
c)
NanoLund and Solid State Physics, Lund University
, Box 118, 22100 Lund, Sweden
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a)
E-mail: david.barker@ftf.lth.se
b)
Also at: Centre for Analysis and Synthesis, Lund University, Box 124, 22100 Lund, Sweden.
c)
E-mail: ville.maisi@ftf.lth.se
Appl. Phys. Lett. 114, 183502 (2019)
Article history
Received:
January 18 2019
Accepted:
March 29 2019
Citation
D. Barker, S. Lehmann, L. Namazi, M. Nilsson, C. Thelander, K. A. Dick, V. F. Maisi; Individually addressable double quantum dots formed with nanowire polytypes and identified by epitaxial markers. Appl. Phys. Lett. 6 May 2019; 114 (18): 183502. https://doi.org/10.1063/1.5089275
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