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However, in the absence of suitable lattice\u2010matched substrates, \u2010Ge and \u2010Si are deposited on defective, metamorphic SiGe buffers, which may impact device performance and scaling. Here an alternative platform is introduced based on the heterojunction between bulk unstrained Ge and a lattice\u2010matched strained silicon\u2010germanium (\u2010SiGe) barrier, eliminating the need for metamorphic buffers altogether. In a structure with a 52\u2010nm\u2010thick \u2010SiGe barrier, a low\u2010disorder two\u2010dimensional hole gas is demonstrated with a high\u2010mobility of  and a low percolation density of . Quantum transport shows that holes confined in the buried unstrained Ge channel have a strong density\u2010dependent in\u2010plane effective mass and out\u2010of\u2010plane \u2010factor, pointing to a significant heavy\u2010hole\u2013light\u2010hole mixing in agreement with theory. Measurements of Zeeman\u2010split levels in quantum point contacts further highlight this character, showing a two\u2010fold larger in\u2010plane \u2010factor in Ge than in \u2010Ge. The prospects of strong spin\u2013orbit interaction, isotopic purification, and of hosting superconducting pairing correlations make this platform appealing for fast quantum hardware and hybrid quantum systems.<\/jats:p>","DOI":"10.1002\/advs.202600066","type":"journal-article","created":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T11:20:01Z","timestamp":1777893601000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Buried Unstrained Germanium Channels: A Lattice\u2010Matched Platform for Quantum Technology"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0009-0008-9053-049X","authenticated-orcid":false,"given":"Davide","family":"Costa","sequence":"first","affiliation":[{"name":"QuTech and Kavli Institute of Nanoscience Delft University of Technology Lorentzweg Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patrick","family":"Del Vecchio","sequence":"additional","affiliation":[{"name":"QuTech and Kavli Institute of Nanoscience Delft University of Technology Lorentzweg Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karina","family":"Hudson","sequence":"additional","affiliation":[{"name":"QuTech and Kavli Institute of Nanoscience Delft University of Technology Lorentzweg Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucas E. 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