| 1. Identity statement | ||||
| Reference Type | Conference Abstract (Conference Proceedings) | |||
| Site | mtc-m21b.sid.inpe.br | |||
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S | |||
| Identifier | 8JMKD3MGP3W34P/3PGF78S | |||
| Repository | sid.inpe.br/mtc-m21b/2017/08.25.17.37 | |||
| Last Update | 2017:12.21.15.46.00 (UTC) simone | |||
| Metadata Repository | sid.inpe.br/mtc-m21b/2017/08.25.17.37.28 | |||
| Metadata Last Update | 2018:06.04.02.27.45 (UTC) administrator | |||
| Secondary Key | INPE--PRE/ | |||
| Citation Key | PirralhoPPSOFRA:2017:AnPhBi | |||
| Title | Anomalous photoconductivity in Bi2Te3 topological insulator films  | |||
| Year | 2017 | |||
| Access Date | 2024, May 18 | |||
| Secondary Type | PRE CN | |||
| Number of Files | 1 | |||
| Size | 1021 KiB | |||
| 2. Context | ||||
| Author | 1 Pirralho, Marilia Jesus Páscao 2 Peres, Marcelos Lima 3 Pena, Fernando Silva 4 Soares, Demetrio A. W. 5 Okazaki, Anderson K. 6 Fornari, Celso Israel 7 Rappl, Paulo Henrique de Oliveira 8 Abramof, Eduardo | |||
| Resume Identifier | 1 2 3 4 5 6 7 8JMKD3MGP5W/3C9JJ37 8 8JMKD3MGP5W/3C9JGUH | |||
| Group | 1 2 3 4 5 6 CMS-ETES-SESPG-INPE-MCTIC-GOV-BR 7 LABAS-COCTE-INPE-MCTIC-GOV-BR 8 LABAS-COCTE-INPE-MCTIC-GOV-BR | |||
| Affiliation | 1 2 3 4 5 6 Instituto Nacional de Pesquisas Espaciais (INPE) 7 Instituto Nacional de Pesquisas Espaciais (INPE) 8 Instituto Nacional de Pesquisas Espaciais (INPE) | |||
| Author e-Mail Address | 1 2 3 4 5 6 celso.fornari@inpe.br 7 paulo.rappl@inpe.br 8 eduardo.abramof@inpe.br | |||
| Conference Name | Brazilian Workshop on Semiconductor Physics, 18 (BWSP) | |||
| Conference Location | Maresias, SP | |||
| Date | 14-18 ago. | |||
| Book Title | Resumos | |||
| History (UTC) | 2017-08-25 17:37:42 :: simone -> administrator :: 2017 2017-09-18 04:40:58 :: administrator -> simone :: 2017 2017-12-11 16:47:56 :: simone -> administrator :: 2017 2018-01-09 11:47:10 :: administrator -> simone :: 2017 2018-01-09 18:24:18 :: simone -> administrator :: 2017 2018-06-04 02:27:45 :: administrator -> simone :: 2017 | |||
| 3. Content and structure | ||||
| Is the master or a copy? | is the master | |||
| Content Stage | completed | |||
| Transferable | 1 | |||
| Content Type | External Contribution | |||
| Version Type | publisher | |||
| Abstract | Topological insulators represent a new state of quantum matter that have an insulating bulk band gap but present metallic surface states. The surface states are topologically protected against non-magnetic impurities and it is possible the existence of a pure spin polarized current [1]. Three dimensional topological insulator as Bi2Te3 has attracted attention due to its topological properties and its potential application for development of spintronic devices [2]. In literature there is little or no information about photoconductivity in topological insulators, in particular in Bi2Te3. Photoconductivity measurements represent a powerful tool to probe the presence of defect states within be band structure and transport via more than one conduction channel. In this work we investigated the photoconductive properties of Bi2Te3 epitaxial layers in the temperature range of 77 to 300K. Unexpectedly, our measurements indicated that samples present negative photoconductivity, where the conductivity reduces under illumination, in the whole range of temperatures. In addition, these measurements revealed the presence of persistent photoconductivity effect for low temperatures, 77K-170K, which may be associated to the existence of a defect level within the band gap. From the photoconductivity decay curves, when light is removed, we could extract recombination times as a function of temperature and hence extract the energy associated to the traps located in band gap[3]. This study will reveal the effect of disorder in the photoconductivity properties in Bi2Te3 films and the role of surface states in the negative photoconductivity effect. Acknowledgments: The authors would like to acknowledge CAPES and FAPEMIG for support. References: [1] P. Dziawa, et al, Nature Materials 11, 1023 (2012); [2] Y. L. Chen, et al. Science 325, 178 (2009); [3] J.A.Hagmann, X.Liu, M.Dobrowolska and J.K.Furdyna. Journal of Applied Physics, 113: 17C724., 2013. | |||
| Area | FISMAT | |||
| Arrangement 1 | urlib.net > Fonds > Produção anterior à 2021 > LABAS > Anomalous photoconductivity in... | |||
| Arrangement 2 | urlib.net > BDMCI > Fonds > Produção pgr ATUAIS > CMS > Anomalous photoconductivity in... | |||
| doc Directory Content | access | |||
| source Directory Content | there are no files | |||
| agreement Directory Content |
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| 4. Conditions of access and use | ||||
| data URL | http://mtc-m21b.sid.inpe.br/ibi/8JMKD3MGP3W34P/3PGF78S | |||
| zipped data URL | http://mtc-m21b.sid.inpe.br/zip/8JMKD3MGP3W34P/3PGF78S | |||
| Language | en | |||
| Target File | abramof_anomalous.pdf | |||
| User Group | self-uploading-INPE-MCTI-GOV-BR simone | |||
| Reader Group | administrator simone | |||
| Visibility | shown | |||
| Read Permission | allow from all | |||
| Update Permission | not transferred | |||
| 5. Allied materials | ||||
| Linking | 8JMKD3MGP3W34P/3HU459L | |||
| Next Higher Units | 8JMKD3MGPCW/3ESR3H2 8JMKD3MGPCW/3F358GL | |||
| Citing Item List | sid.inpe.br/mtc-m21/2012/07.13.14.44.57 4 sid.inpe.br/mtc-m21/2012/07.13.14.57.50 2 sid.inpe.br/bibdigital/2013/10.14.21.39 2 | |||
| Host Collection | sid.inpe.br/mtc-m21b/2013/09.26.14.25.20 | |||
| 6. Notes | ||||
| Empty Fields | archivingpolicy archivist callnumber copyholder copyright creatorhistory descriptionlevel dissemination doi e-mailaddress edition editor format isbn issn keywords label lineage mark mirrorrepository nextedition notes numberofvolumes orcid organization pages parameterlist parentrepositories previousedition previouslowerunit progress project publisher publisheraddress rightsholder schedulinginformation secondarydate secondarymark serieseditor session shorttitle sponsor subject tertiarytype type url volume | |||
| 7. Description control | ||||
| e-Mail (login) | simone | |||
| update | ||||