eprintid: 112727 rev_number: 45 eprint_status: archive userid: 608 dir: disk0/00/11/27/27 datestamp: 2010-10-21 15:24:23 lastmod: 2021-11-29 00:15:14 status_changed: 2010-10-21 15:24:23 type: proceedings_section metadata_visibility: show item_issues_count: 0 creators_name: Stoneham, AM creators_name: Gavartin, J creators_name: Shluger, AL creators_name: Kimmel, AV creators_name: Ramo, DM creators_name: Ronnow, HM creators_name: Aeppli, G creators_name: Renner, C title: Trapping, self-trapping and the polaron family ispublished: pub subjects: 11050 divisions: UCL divisions: B04 divisions: C06 divisions: F60 keywords: ELECTRON-SPIN-RESONANCE, ALKALINE-EARTH FLUORIDES, HAFNIUM OXIDE, DIELECTRIC-PROPERTIES, SLOW-ELECTRONS, GATE OXIDES, AB-INITIO, VK CENTER, MODEL, HOLES note: Text made available to UCL Discovery by kind permission of IOP Publishing, 2012 abstract: The earliest ideas of the polaron recognized that the coupling of an electron to ionic vibrations would affect its apparent mass and could effectively immobilize the carrier (self-trapping). We discuss how these basic ideas have been generalized to recognize new materials and new phenomena. First, there is an interplay between self-trapping and trapping associated with defects or with fluctuations in an amorphous solid. In high dielectric constant oxides, like HfO2, this leads to oxygen vacancies having as many as five charge states. In colossal magnetoresistance manganites, this interplay makes possible the scanning tunnelling microscopy ( STM) observation of polarons. Second, excitons can self-trap and, by doing so, localize energy in ways that can modify the material properties. Third, new materials introduce new features, with polaron-related ideas emerging for uranium dioxide, gate dielectric oxides, Jahn-Teller systems, semiconducting polymers and biological systems. The phonon modes that initiate self-trapping can be quite different from the longitudinal optic modes usually assumed to dominate. Fourth, there are new phenomena, like possible magnetism in simple oxides, or with the evolution of short-lived polarons, like muons or excitons. The central idea remains that of a particle whose properties are modified by polarizing or deforming its host solid, sometimes profoundly. However, some of the simpler standard assumptions can give a limited, indeed misleading, description of real systems, with qualitative inconsistencies. We discuss representative cases for which theory and experiment can be compared in detail. date: 2007-06-27 publisher: IOP PUBLISHING LTD official_url: http://dx.doi.org/10.1088/0953-8984/19/25/255208 vfaculties: VMPS oa_status: green language: eng primo: open primo_central: open_green verified: verified_batch elements_source: Web of Science elements_id: 151086 doi: 10.1088/0953-8984/19/25/255208 lyricists_name: Aeppli, Gabriel lyricists_name: Kimmel, Anna lyricists_name: Shluger, Alexander lyricists_name: STONEHAM, ARTHUR lyricists_id: GAEPP46 lyricists_id: AKIMM05 lyricists_id: ASHLU39 lyricists_id: AMSTO63 full_text_status: public volume: 19 number: 25 pagerange: 1-22 event_title: European Science Foundation Exploratory Workshop on Motts Physics in Nanowires and Quantum Dots event_location: Gonville & Caius Coll, Cambridge, ENGLAND event_dates: 2006-07-31 - 2006-08-02 issn: 0953-8984 book_title: JOURNAL OF PHYSICS-CONDENSED MATTER citation: Stoneham, AM; Gavartin, J; Shluger, AL; Kimmel, AV; Ramo, DM; Ronnow, HM; Aeppli, G; Stoneham, AM; Gavartin, J; Shluger, AL; Kimmel, AV; Ramo, DM; Ronnow, HM; Aeppli, G; Renner, C; - view fewer <#> (2007) Trapping, self-trapping and the polaron family. In: JOURNAL OF PHYSICS-CONDENSED MATTER. (pp. pp. 1-22). IOP PUBLISHING LTD Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/112727/1/0953-8984_19_25_255208.pdf