New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study
A remarkable feature of vanadium dioxide is that it can be synthesized in a number of polymorphs. The conductivity mechanism in the metastable layered polymorph VO2(B) thin films has been investigated by terahertz time-domain spectroscopy (THz-TDS). In VO2(B), a critical temperature of 240 K marks t...
| Main Authors: | , , , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2015
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/107194 http://hdl.handle.net/10220/25387 |
| _version_ | 1824455504358801408 |
|---|---|
| author | Chia, Elbert E. M. Lourembam, James Srivastava, Amar La-o-vorakiat, Chan Rotella, H. Venkatesan, T. |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Chia, Elbert E. M. Lourembam, James Srivastava, Amar La-o-vorakiat, Chan Rotella, H. Venkatesan, T. |
| author_sort | Chia, Elbert E. M. |
| collection | NTU |
| description | A remarkable feature of vanadium dioxide is that it can be synthesized in a number of polymorphs. The conductivity mechanism in the metastable layered polymorph VO2(B) thin films has been investigated by terahertz time-domain spectroscopy (THz-TDS). In VO2(B), a critical temperature of 240 K marks the appearance of a non-zero Drude term in the observed complex conductivity, indicating the evolution from a pure insulating state towards a metallic state. In contrast, the THz conductivity of the well-known VO2(M1) is well fitted only by a modification of the Drude model to include backscattering. We also identified two different THz conductivity regimes separated by temperature in these two polymorphs. The electronic phase diagram is constructed, revealing that the width and onset of the metal-insulator transition in the B phase develop differently from the M1 phase. |
| first_indexed | 2025-02-19T03:39:15Z |
| format | Journal Article |
| id | ntu-10356/107194 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:39:15Z |
| publishDate | 2015 |
| record_format | dspace |
| spelling | ntu-10356/1071942023-02-28T19:35:53Z New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study Chia, Elbert E. M. Lourembam, James Srivastava, Amar La-o-vorakiat, Chan Rotella, H. Venkatesan, T. School of Physical and Mathematical Sciences DRNTU::Science::Physics A remarkable feature of vanadium dioxide is that it can be synthesized in a number of polymorphs. The conductivity mechanism in the metastable layered polymorph VO2(B) thin films has been investigated by terahertz time-domain spectroscopy (THz-TDS). In VO2(B), a critical temperature of 240 K marks the appearance of a non-zero Drude term in the observed complex conductivity, indicating the evolution from a pure insulating state towards a metallic state. In contrast, the THz conductivity of the well-known VO2(M1) is well fitted only by a modification of the Drude model to include backscattering. We also identified two different THz conductivity regimes separated by temperature in these two polymorphs. The electronic phase diagram is constructed, revealing that the width and onset of the metal-insulator transition in the B phase develop differently from the M1 phase. Published version 2015-04-13T06:37:55Z 2019-12-06T22:26:26Z 2015-04-13T06:37:55Z 2019-12-06T22:26:26Z 2015 2015 Journal Article Lourembam, J., Srivastava, A., La-o-vorakiat, C., Rotella, H., Venkatesan, T., & Chia, E. E. M. (2015). New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study. Scientific reports, 5. 2045-2322 https://hdl.handle.net/10356/107194 http://hdl.handle.net/10220/25387 10.1038/srep09182 25777320 en Scientific reports This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ 8 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics Chia, Elbert E. M. Lourembam, James Srivastava, Amar La-o-vorakiat, Chan Rotella, H. Venkatesan, T. New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study |
| title | New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study |
| title_full | New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study |
| title_fullStr | New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study |
| title_full_unstemmed | New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study |
| title_short | New insights into the diverse electronic phases of a novel vanadium dioxide polymorph : a terahertz spectroscopy study |
| title_sort | new insights into the diverse electronic phases of a novel vanadium dioxide polymorph a terahertz spectroscopy study |
| topic | DRNTU::Science::Physics |
| url | https://hdl.handle.net/10356/107194 http://hdl.handle.net/10220/25387 |
| work_keys_str_mv | AT chiaelbertem newinsightsintothediverseelectronicphasesofanovelvanadiumdioxidepolymorphaterahertzspectroscopystudy AT lourembamjames newinsightsintothediverseelectronicphasesofanovelvanadiumdioxidepolymorphaterahertzspectroscopystudy AT srivastavaamar newinsightsintothediverseelectronicphasesofanovelvanadiumdioxidepolymorphaterahertzspectroscopystudy AT laovorakiatchan newinsightsintothediverseelectronicphasesofanovelvanadiumdioxidepolymorphaterahertzspectroscopystudy AT rotellah newinsightsintothediverseelectronicphasesofanovelvanadiumdioxidepolymorphaterahertzspectroscopystudy AT venkatesant newinsightsintothediverseelectronicphasesofanovelvanadiumdioxidepolymorphaterahertzspectroscopystudy |