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Advanced Electronic Structure Calculations For Nanoelectronics Using Finite Element Bases and Effective Mass Theory

Springer Series in Materials Science series Computational Materials, Chemistry, and Biochemistry: From Bold Initiatives to the Last Mile

Laros, James H.; Nielsen, Erik N.; Baczewski, Andrew D.; Moussa, Jonathan E.; Gao, Xujiao G.; Salinger, Andrew G.; Muller, Richard P.

This paper describes our work over the past few years to use tools from quantum chemistry to describe electronic structure of nanoelectronic devices. These devices, dubbed "artificial atoms", comprise a few electrons, con ned by semiconductor heterostructures, impurities, and patterned electrodes, and are of intense interest due to potential applications in quantum information processing, quantum sensing, and extreme-scale classical logic. We detail two approaches we have employed: nite-element and Gaussian basis sets, exploring the interesting complications that arise when techniques that were intended to apply to atomic systems are instead used for artificial, solid-state devices.

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TYPE Journal Article YEAR 2017
OSTI

Probing low noise at the MOS interface with a spin-orbit qubit

arXiv.org

Jock, Ryan M.; Jacobson, Noah T.; Harvey-Collard, Patrick; Mounce, Andrew M.; Srinivasa, Vanita S.; Ward, Daniel R.; Anderson, John M.; Manginell, Ronald P.; Wendt, J.R.; Rudolph, Martin R.; Pluym, Tammy P.; Laros, James H.; Baczewski, Andrew D.; Witzel, Wayne W.; Carroll, Malcolm

The silicon metal-oxide-semiconductor (MOS) material system is technologically important for the implementation of electron spin-based quantum information technologies. Researchers predict the need for an integrated platform in order to implement useful computation, and decades of advancements in silicon microelectronics fabrication lends itself to this challenge. However, fundamental concerns have been raised about the MOS interface (e.g. trap noise, variations in electron g-factor and practical implementation of multi-QDs). Furthermore, two-axis control of silicon qubits has, to date, required the integration of non-ideal components (e.g. microwave strip-lines, micro-magnets, triple quantum dots, or introduction of donor atoms). In this paper, we introduce a spin-orbit (SO) driven singlet- triplet (ST) qubit in silicon, demonstrating all-electrical two-axis control that requires no additional integrated elements and exhibits charge noise properties equivalent to other more model, but less commercially mature, semiconductor systems. We demonstrate the ability to tune an intrinsic spin-orbit interface effect, which is consistent with Rashba and Dresselhaus contributions that are remarkably strong for a low spin-orbit material such as silicon. The qubit maintains the advantages of using isotopically enriched silicon for producing a quiet magnetic environment, measuring spin dephasing times of 1.6 μs using 99.95% 28Si epitaxy for the qubit, comparable to results from other isotopically enhanced silicon ST qubit systems. This work, therefore, demonstrates that the interface inherently provides properties for two-axis control, and the technologically important MOS interface does not add additional detrimental qubit noise. isotopically enhanced silicon ST qubit systems

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TYPE Journal Article YEAR 2017
OSTI
Results 151–175 of 233
Results 151–175 of 233