Temperature-dependent broadening of coherent current peaks in InAs double quantum dots

authored by: Olfa Dani, Robert Hussein, Johannes C. Bayer, Sigmund Kohler, Rolf J. Haug
Abstract: Quantum systems as used for quantum computation or quantum sensing are nowadays often realized in solid state devices as e.g. complex Josephson circuits or coupled quantum-dot systems. Condensed matter as an environment influences heavily the quantum coherence of such systems. Here, we investigate electron transport through asymmetrically coupled InAs double quantum dots and observe an extremely strong temperature dependence of the coherent current peaks of single-electron tunneling. We analyze experimentally and theoretically the broadening of such coherent current peaks up to temperatures of 20K and we are able to model it with quantum dissipation being due to two different bosonic baths. These bosonic baths mainly originate from substrate phonons. Application of a magnetic field helps us to identify the different quantum dot states through their temperature dependence.
Organisation(s): Institute of Solid State Physics
External Organisation(s): Friedrich Schiller University Jena
Institute of Mathematical Sciences - ICMAT
Type: Article
Journal: Communications Physics
Volume: 5
ISSN: 2399-3650
Publication date: 18.11.2022
Publication status: Published
Peer reviewed: Yes
Electronic version(s): https://doi.org/10.1038/s42005-022-01074-z (Access: Open)

BibTeX

@article{50a6937dcba54133bcc28ae84e46c1e1,
title = "Temperature-dependent broadening of coherent current peaks in InAs double quantum dots",
abstract = "Quantum systems as used for quantum computation or quantum sensing are nowadays often realized in solid state devices as e.g. complex Josephson circuits or coupled quantum-dot systems. Condensed matter as an environment influences heavily the quantum coherence of such systems. Here, we investigate electron transport through asymmetrically coupled InAs double quantum dots and observe an extremely strong temperature dependence of the coherent current peaks of single-electron tunneling. We analyze experimentally and theoretically the broadening of such coherent current peaks up to temperatures of 20K and we are able to model it with quantum dissipation being due to two different bosonic baths. These bosonic baths mainly originate from substrate phonons. Application of a magnetic field helps us to identify the different quantum dot states through their temperature dependence.",
author = "Olfa Dani and Robert Hussein and Bayer, {Johannes C.} and Sigmund Kohler and Haug, {Rolf J.}",
note = "Funding Information: O.D., J.C.B., and R.J.H. acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany{\textquoteright}s Excellence Strategy -EXC 2123 QuantumFrontiers-390837967 and the State of Lower Saxony of Germany via the Hannover School for Nanotechnology. S.K. acknowledges financial support by the Spanish Ministry of Science and Innovation through Grant. No. PID2020-117787GB-I00 and the CSIC Research Platform on Quantum Technologies PTI-001. We thank Klaus Pierz and Peter Hinze for heterostructure growth and transmission electron microscope investigations and Jan K{\"u}hne and Felix Opiela for contributions at the beginning of the project.",
year = "2022",
month = nov,
day = "18",
doi = "10.1038/s42005-022-01074-z",
language = "English",
volume = "5",
journal = "Communications Physics",
issn = "2399-3650",
publisher = "Springer Nature",
number = "1",
}