Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 심상완 | - |
dc.date.accessioned | 2019-05-27T02:13:43Z | - |
dc.date.available | 2019-05-27T02:13:43Z | - |
dc.date.issued | 2015-06 | - |
dc.identifier.citation | PHYSICAL REVIEW B, v. 91, No. 23, Article no. 235438 | en_US |
dc.identifier.issn | 1098-0121 | - |
dc.identifier.issn | 1550-235X | - |
dc.identifier.uri | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.235438 | - |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/105980 | - |
dc.description.abstract | Asymmetric Fano resonance arises from quantum interference between discrete and continuum states. The characteristic asymmetry has attracted strong interests in understanding light-induced optoelectronic responses and corresponding applications. In conventional solids, however, the tunability of Fano resonance is generally limited by a material's intrinsic property. Topological insulators are unique states of matter embodying both conducting Dirac surface and underlying bulk. If it is possible to manipulate the two coexisting states, then it should form an ideal laboratory for realizing a tunable topological Fano system. Here, with the recently discovered topological phase transition in (Bi1-xInx)(2)Se-3, we report tunable Fano interference phenomena. By engineering the spatial overlap between surface Dirac electrons (continuous terahertz transitions) and bulk phonon (discrete mode at similar to 2 terahertz), we continuously tune, abruptly switch, and dynamically modulate the Fano resonance. Eliminating the topological surface via decreasing spin-orbit coupling-that is, across topological and nontopological phases, we find that the asymmetric Fano spectra return to the symmetric profile. Laser-excited ultrafast terahertz spectroscopy reveals that the controlled spatial overlap is responsible for the picosecond tunability of the Fano resonance, suggesting potentials toward optically controllable topological Fano systems. | en_US |
dc.description.sponsorship | The work at Yonsei was supported by National Research Foundation of Korea (NRF) through the government of Korea (MSIP) (Grants No. NRF-2011-0013255, No. NRF-2009-0083512, and No. WCI 2011-001), Global Frontier Program (2014M3A6B3063709), the Yonsei University Yonsei-SNU Collaborative Research Fund of 2014, and the Yonsei University Future-Leading Research Initiative of 2014. M.B., N.K., and S.O. were supported by the National Science Foundation (NSF Grant No. DMR-0845464) and the Office of Naval Research (Grant No. ONR N000141210456). J.H.S., and M.-H.J. were supported by Institute for Basic Science (IBS), Korea under the contract number of IBS-R014-G1. | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | AMER PHYSICAL SOC | en_US |
dc.subject | DIRAC FERMIONS | en_US |
dc.subject | INSULATOR | en_US |
dc.subject | SPECTROSCOPY | en_US |
dc.subject | RESONANCE | en_US |
dc.subject | TERAHERTZ | en_US |
dc.subject | GRAPHENE | en_US |
dc.subject | PHONONS | en_US |
dc.subject | SURFACE | en_US |
dc.subject | STATE | en_US |
dc.title | Tunable Fano quantum-interference dynamics using a topological phase transition in (Bi1-xInx)(2)Se-3 | en_US |
dc.type | Article | en_US |
dc.relation.volume | 91 | - |
dc.identifier.doi | 10.1103/PhysRevB.91.235438 | - |
dc.relation.page | 235438-435438 | - |
dc.relation.journal | PHYSICAL REVIEW B | - |
dc.contributor.googleauthor | Sim, Sangwan | - |
dc.contributor.googleauthor | Koirala, Nikesh | - |
dc.contributor.googleauthor | Brahlek, Matthew | - |
dc.contributor.googleauthor | Sung, Ji Ho | - |
dc.contributor.googleauthor | Park, Jun | - |
dc.contributor.googleauthor | Cha, Soonyoung | - |
dc.contributor.googleauthor | Jo, Moon-Ho | - |
dc.contributor.googleauthor | Oh, Seongshik | - |
dc.contributor.googleauthor | Choi, Hyunyong | - |
dc.relation.code | 2015001929 | - |
dc.sector.campus | E | - |
dc.sector.daehak | COLLEGE OF ENGINEERING SCIENCES[E] | - |
dc.sector.department | DIVISION OF ELECTRICAL ENGINEERING | - |
dc.identifier.pid | swsim | - |
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