Full metadata record
DC Field | Value | Language |
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dc.contributor.author | 심상완 | - |
dc.date.accessioned | 2019-05-23T02:10:28Z | - |
dc.date.available | 2019-05-23T02:10:28Z | - |
dc.date.issued | 2018-07 | - |
dc.identifier.citation | ACS PHOTONICS, v. 5, No. 8, Page. 3347-3352 | en_US |
dc.identifier.issn | 2330-4022 | - |
dc.identifier.uri | https://pubs.acs.org/doi/abs/10.1021/acsphotonics.8b00592 | - |
dc.identifier.uri | https://repository.hanyang.ac.kr/handle/20.500.11754/105816 | - |
dc.description.abstract | The nature of spin transport in the bulk and side surface of three-dimensional topological insulator thin film geometry is a relatively unexplored subject, compared to the extensively studied top and bottom surface states. Here we employ time-and space-resolved helicity-dependent photocurrent measurements to investigate the effect of optically excited bulk carriers on the spin-polarized topological side surface conduction. Time-resolved femtosecond double-pulse excitation reveals that the spin current toward the side surface arises from the bulk-originated spin Hall effect (SHE), whose microscopic origin is governed by an Elliott Yafet-type spin relaxation mechanism via an extrinsic side jump process. Bias-and temperature-dependent measurements further confirm that the spin scattering in Bi2Se3 has multiple sources including impurity and electron phonon scattering. The SHE-assisted side surface spin conduction shows an exceptionally high charge-to-spin conversion efficiency of 35% at 77 K, which may offer new spintronic applications of topological insulators such as spin orbit torque or spin-flip controlled light-emitting devices. | en_US |
dc.description.sponsorship | J.L., S.S., S.P., S.C., S.L, C.I., S.C., and H.C. were supported by the National Research Foundation of Korea (NRF) through the government of Korea (MSIP) (grant nos. NRF-2016R1A4A1012929 and NRF-2015R1A2A1A10052520) and the Global Frontier Program (grant no. 2014M3A6B3063709). H.K. and J.S.K. were supported by SRC Center for Topological Matter (grant no. 2011-0030785) and Max-Plank POSTECH/KOREA Research Initiative (grant no. 2016K1A4A4A01922028). J.K. and D.L. were supported by the Basic Science Research Program through the NRF funded by MSIP (grant no. NRF-2015R1C1A1A02037430). | en_US |
dc.language.iso | en_US | en_US |
dc.publisher | AMER CHEMICAL SOC | en_US |
dc.subject | topological insulators | en_US |
dc.subject | spin relaxation | en_US |
dc.subject | spin Hall effect | en_US |
dc.subject | photocurrent | en_US |
dc.subject | ultrafast | en_US |
dc.title | Role of spin Hall effect in the topological side surface conduction | en_US |
dc.type | Article | en_US |
dc.identifier.doi | 10.1021/acsphotonics.8b00592 | - |
dc.relation.journal | ACS PHOTONICS | - |
dc.contributor.googleauthor | Lee, Jekwan | - |
dc.contributor.googleauthor | Sim, Sangwan | - |
dc.contributor.googleauthor | Park, Soohyun | - |
dc.contributor.googleauthor | In, Chihun | - |
dc.contributor.googleauthor | Cho, Seungwan | - |
dc.contributor.googleauthor | Lee, Seungmin | - |
dc.contributor.googleauthor | Cha, Soonyoung | - |
dc.contributor.googleauthor | Lee, Sooun | - |
dc.contributor.googleauthor | Kim, Hoil | - |
dc.contributor.googleauthor | Kim, Jehyun | - |
dc.contributor.googleauthor | Shim, Wooyoung | - |
dc.contributor.googleauthor | Kim, Jun Sung | - |
dc.contributor.googleauthor | Kim, Dohun | - |
dc.contributor.googleauthor | Choi, Hyunyong | - |
dc.relation.code | 2018009669 | - |
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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