SiGe/Si(111)/SiGe heterostructure for Si spin qubits with electrons confined in L valley of conduction band
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Quantum Physics arXiv:2604.13435 (quant-ph) [Submitted on 15 Apr 2026] Title:SiGe/Si(111)/SiGe heterostructure for Si spin qubits with electrons confined in L valley of conduction band Authors:Takafumi Tokunaga, Hiromichi Nakazato View a PDF of the paper titled SiGe/Si(111)/SiGe heterostructure for Si spin qubits with electrons confined in L valley of conduction band, by Takafumi Tokunaga and Hiromichi Nakazato View PDF HTML (experimental) Abstract:In Si(111) crystals, a strong biaxial tensile strain applied within the (111) plane is considered to shift the lowest energy point of the conduction band from the $\Delta$ valley to the L valley. Electrons confined in this L valley experience a splitting of their quadruply degenerate energy levels into an undegenerate single-level ground state (L1) and a triply degenerate excited state (L3). The energy of the single-level ground state is sufficiently low relative to the energies of the L3 valley and the $\Delta$ valley, making it optimal as a two-level system for a qubit. Using deformation potential theory and incorporating quantum effects from electron confinement in the SiGe/Si(111)/SiGe structure, we determine the value of the biaxial tensile strain causing the shift of the conduction band energy minimum from the $\Delta$ valley to the L valley, along with the corresponding Ge concentration. We also calculate the critical thickness for the plastic relaxation of the Si quantum well under this large biaxial tensile strain and examine the feasibility of realizing it as a SiGe/Si(111)/SiGe heterostructure. Comments: Subjects: Quantum Physics (quant-ph) Cite as: arXiv:2604.13435 [quant-ph] (or arXiv:2604.13435v1 [quant-ph] for this version) https://doi.org/10.48550/arXiv.2604.13435 Focus to learn more arXiv-issued DOI via DataCite (pending registration) Submission history From: Takafumi Tokunaga [view email] [v1] Wed, 15 Apr 2026 03:27:52 UTC (513 KB) Full-text links: Access Paper: View a PDF of the paper titled SiGe/Si(111)/SiGe heterostructure for Si spin qubits with electrons confined in L valley of conduction band, by Takafumi Tokunaga and Hiromichi NakazatoView PDFHTML (experimental)TeX Source view license Current browse context: quant-ph new | recent | 2026-04 References & Citations INSPIRE HEP NASA ADSGoogle Scholar Semantic Scholar export BibTeX citation Loading... BibTeX formatted citation × loading... Data provided by: Bookmark Bibliographic Tools Bibliographic and Citation Tools Bibliographic Explorer Toggle Bibliographic Explorer (What is the Explorer?) Connected Papers Toggle Connected Papers (What is Connected Papers?) Litmaps Toggle Litmaps (What is Litmaps?) scite.ai Toggle scite Smart Citations (What are Smart Citations?) Code, Data, Media Code, Data and Media Associated with this Article alphaXiv Toggle alphaXiv (What is alphaXiv?) Links to Code Toggle CatalyzeX Code Finder for Papers (What is CatalyzeX?) DagsHub Toggle DagsHub (What is DagsHub?) GotitPub Toggle Gotit.pub (What is GotitPub?) Huggingface Toggle Hugging Face (What is Huggingface?) ScienceCast Toggle ScienceCast (What is ScienceCast?) Demos Demos Replicate Toggle Replicate (What is Replicate?) Spaces Toggle Hugging Face Spaces (What is Spaces?) Spaces Toggle TXYZ.AI (What is TXYZ.AI?) Related Papers Recommenders and Search Tools Link to Influence Flower Influence Flower (What are Influence Flowers?) Core recommender toggle CORE Recommender (What is CORE?) Author Venue Institution Topic About arXivLabs arXivLabs: experimental projects with community collaborators arXivLabs is a framework that allows collaborators to develop and share new arXiv features directly on our website. Both individuals and organizations that work with arXivLabs have embraced and accepted our values of openness, community, excellence, and user data privacy. arXiv is committed to these values and only works with partners that adhere to them. Have an idea for a project that will add value for arXiv's community? Learn more about arXivLabs. Which authors of this paper are endorsers? | Disable MathJax (What is MathJax?)