Heterogeneous integration of superconducting thin films and epitaxial semiconductor heterostructures with lithium niobate
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Published:2023-06-08
Issue:36
Volume:56
Page:365105
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ISSN:0022-3727
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Container-title:Journal of Physics D: Applied Physics
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language:
-
Short-container-title:J. Phys. D: Appl. Phys.
Author:
Lienhart MichelleORCID,
Choquer MichaelORCID,
Nysten Emeline D SORCID,
Weiß MatthiasORCID,
Müller KaiORCID,
Finley Jonathan JORCID,
Moody GalanORCID,
Krenner Hubert JORCID
Abstract
Abstract
We report on scalable heterointegration of superconducting electrodes and epitaxial semiconductor quantum dots (QDs) on strong piezoelectric and optically nonlinear lithium niobate. The implemented processes combine the sputter-deposited thin film superconductor niobium nitride and III–V compound semiconductor membranes onto the host substrate. The superconducting thin film is employed as a zero-resistivity electrode material for a surface acoustic wave resonator with internal quality factors
Q
≈
17
000
representing a three-fold enhancement compared to identical devices with normal conducting electrodes. Superconducting operation of
≈
400
M
H
z
resonators is achieved to temperatures
T
>
7
K
and electrical radio frequency powers
P
r
f
>
+
9
d
B
m
. Heterogeneously integrated single QDs couple to the resonant phononic field of the surface acoustic wave resonator operated in the superconducting regime. Position and frequency selective coupling mediated by deformation potential coupling is validated using time-integrated and time-resolved optical spectroscopy. Furthermore, acoustoelectric charge state control is achieved in a modified device geometry harnessing large piezoelectric fields inside the resonator. The hybrid QD—surface acoustic wave resonator can be scaled to higher operation frequencies and smaller mode volumes for quantum phase modulation and transduction between photons and phonons via the QD. Finally, the employed materials allow for the realization of other types of optoelectronic devices, including superconducting single photon detectors and integrated photonic and phononic circuits.
Funder
National Science Foundation
Deutsche Forschungsgemeinschaft
Bundesministerium für Bildung und Forschung
Bayerisch-Kalifornischen Hochschulzentrum
Subject
Surfaces, Coatings and Films,Acoustics and Ultrasonics,Condensed Matter Physics,Electronic, Optical and Magnetic Materials