DC Field | Value | Language |
---|---|---|
dc.contributor.author | SIM, SANGWAN | - |
dc.contributor.author | LEE, SEUNGMIN | - |
dc.contributor.author | MOON, JISOO | - |
dc.contributor.author | IN, CHIHUN | - |
dc.contributor.author | LEE, JEKWAN | - |
dc.contributor.author | NOH, MINJI | - |
dc.contributor.author | KIM, JEHYUN | - |
dc.contributor.author | JANG, WOOSUN | - |
dc.contributor.author | CHA, SOONYOUNG | - |
dc.contributor.author | SEO, SEUNGYOUNG | - |
dc.contributor.author | OH, SANGSHIK | - |
dc.contributor.author | KIM, DOHUN | - |
dc.contributor.author | SOON, ALOYSIUS | - |
dc.contributor.author | JO, MOON HO | - |
dc.contributor.author | CHOI, HYUNYONG | - |
dc.date.accessioned | 2020-03-26T01:50:24Z | - |
dc.date.available | 2020-03-26T01:50:24Z | - |
dc.date.created | 2020-03-25 | - |
dc.date.issued | 2020-03-18 | - |
dc.identifier.issn | 2330-4022 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/101852 | - |
dc.description.abstract | Resolving the complex interplay between surface and bulk response is a long-standing issue in the topological insulators (TIs). Some studies have reported surface-dominated metallic responses, yet others show semiconducting-like bulk photoconductance. Using ultrafast terahertz spectroscopy with the advent of Fermi-level engineered TIs, we discovered that such difference arises from the time-dependent competing process of two parameters, namely, the Dirac-carrier surface scattering rate and the bulk Drude weight. After infrared femtosecond pulse excitation, we observed a metal-like photoconductance reduction for the prototypical n-type Bi2Se3 and a semiconductor-like increased photoconductance for the p-type Bi2Se3. Surprisingly, the bulkinsulating Bi2Se3, which is presumably similar to graphene, exhibits a semiconducting-to-metallic phase apparent transition at 10 ps. The sign-reversed, yet long-lasting (>= 500 ps) metallic photoconductance was observed only in the bulk-insulating Bi2Se3, indicating that such dynamic phase transition is governed by the time-dependent competing interplay between the surface scattering rate and the bulk Drude weight. Our observations illustrate new photophysical phenomena of the photoexcited-phase transition in TIs and demonstrate entirely distinct dynamics compared to graphene and conventional gapped semiconductors. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.relation.isPartOf | ACS PHOTONICS | - |
dc.subject | PHONON INTERACTION | - |
dc.subject | THZ GENERATION | - |
dc.subject | CONVERSION | - |
dc.title | Picosecond Competing Dynamics of Apparent Semiconducting-Metallic Phase Transition in the Topological Insulator Bi2Se3 | - |
dc.type | Article | - |
dc.identifier.doi | 10.1021/acsphotonics.9b01603 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | ACS PHOTONICS, v.7, no.3, pp.759 - 764 | - |
dc.identifier.wosid | 000526350900027 | - |
dc.citation.endPage | 764 | - |
dc.citation.number | 3 | - |
dc.citation.startPage | 759 | - |
dc.citation.title | ACS PHOTONICS | - |
dc.citation.volume | 7 | - |
dc.contributor.affiliatedAuthor | SEO, SEUNGYOUNG | - |
dc.contributor.affiliatedAuthor | JO, MOON HO | - |
dc.identifier.scopusid | 2-s2.0-85081402688 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | PHONON INTERACTION | - |
dc.subject.keywordPlus | THZ GENERATION | - |
dc.subject.keywordPlus | CONVERSION | - |
dc.subject.keywordAuthor | topological insulator | - |
dc.subject.keywordAuthor | ultrafast spectroscopy | - |
dc.subject.keywordAuthor | terahertz spectroscopy | - |
dc.subject.keywordAuthor | apparent phase transition | - |
dc.relation.journalWebOfScienceCategory | Nanoscience & Nanotechnology | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.relation.journalWebOfScienceCategory | Optics | - |
dc.relation.journalWebOfScienceCategory | Physics, Applied | - |
dc.relation.journalWebOfScienceCategory | Physics, Condensed Matter | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalResearchArea | Materials Science | - |
dc.relation.journalResearchArea | Optics | - |
dc.relation.journalResearchArea | Physics | - |
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