{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T07:03:59Z","timestamp":1772089439965,"version":"3.50.1"},"reference-count":22,"publisher":"IOP Publishing","issue":"8","license":[{"start":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T00:00:00Z","timestamp":1772064000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/iop-standard\/v1"},{"start":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T00:00:00Z","timestamp":1772064000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"},{"start":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T00:00:00Z","timestamp":1772064000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/questions\/alternative-author-rights-policies\/"},{"start":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T00:00:00Z","timestamp":1772064000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/publishingsupport.iopscience.iop.org\/questions\/alternative-author-rights-policies\/"}],"funder":[{"DOI":"10.13039\/501100001843","name":"Science and Engineering Research Board","doi-asserted-by":"crossref","award":["CRG\/2021\/001360"],"award-info":[{"award-number":["CRG\/2021\/001360"]}],"id":[{"id":"10.13039\/501100001843","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["Nanotechnology"],"published-print":{"date-parts":[[2026,2,27]]},"abstract":"Abstract<\/jats:title>\n \n We report quantized conductance and quantum point contact (QPC) formation in memristive devices comprising exfoliated hexagonal boron nitride (hBN) over HfO\n 2<\/jats:sub>\n as the active layer. The scattered hBN flakes locally enhance oxygen vacancy concentration, forming the filamentary paths beneath Ag top electrodes (TEs). These topographical inhomogeneities create atomically narrow constrictions that act as QPCs. X-ray diffraction measurements indicate strain in the hBN stacks, whereas the Raman\n \n \n \n <\/jats:tex-math>\n \n \n \n \n E<\/mml:mi>\n \n \n 2g<\/mml:mtext>\n <\/mml:mrow>\n <\/mml:mrow>\n <\/mml:msub>\n <\/mml:mrow>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n mode shows a small shift (1364\u20131366 cm\n \u22121<\/jats:sup>\n ) and broadening indicative of strain and substrate coupling. Electrical characterization exhibits conductance plateaus close to integer and half-integer multiples of\n \n \n \n <\/jats:tex-math>\n \n \n \n G<\/mml:mi>\n 0<\/mml:mn>\n <\/mml:msub>\n =<\/mml:mo>\n 2<\/mml:mn>\n \n e<\/mml:mi>\n 2<\/mml:mn>\n <\/mml:msup>\n \/<\/mml:mo>\n h<\/mml:mi>\n <\/mml:mrow>\n <\/mml:math>\n <\/jats:inline-formula>\n , along with hysteretic current\u2013voltage behavior consistent with filament evolution. We propose a unified morphological-ionic model where randomly distributed hBN flakes create nanoscale topography that steers oxygen-vacancy accumulation and produces QPCs at the TE\/hBN interface. The results highlight van-der-Waals\/oxide heterostructures as promising platforms for atomic-scale memristive devices and secure stochastic hardware primitives.\n <\/jats:p>","DOI":"10.1088\/1361-6528\/ae4756","type":"journal-article","created":{"date-parts":[[2026,2,18]],"date-time":"2026-02-18T22:47:56Z","timestamp":1771454876000},"page":"085001","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Conductance quantization and quantum-point-contact formation in hBN\/HfO\n 2<\/sub>\n bilayer memristive devices"],"prefix":"10.1088","volume":"37","author":[{"given":"Tanmayee","family":"Parida","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arpan","family":"Bhattacharyya","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ummiya","family":"Qamar","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0147-449X","authenticated-orcid":true,"given":"Santanu","family":"Das","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0805-4527","authenticated-orcid":true,"given":"Aloke","family":"Kanjilal","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2026,2,26]]},"reference":[{"key":"nanoae4756bib1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.202201248","type":"journal-article","article-title":"Quantum conductance in memristive devices: fundamentals, developments, and applications","volume":"34","author":"Milano","year":"2022","journal-title":"Adv. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2025-12-01","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-02-18","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2026-02-26","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}