講演情報
[18p-D61-21]Observation of bulk and multiple surface states in a thick topological Dirac semimetal α-Sn film by quantum transport
〇牧 秀樹1、堀田 智貴1、福岡 蒼一朗1、Le Duc Anh1,2、田中 雅明1,2 (1.東大工、2.東大CSRN)
キーワード：
トポロジカル・ディラック半金属、α-Sn、量子振動
We grew a 40 nm-thick topological Dirac semimetal (TDS) α-Sn film on an InSb (001) substrate by molecular beam epitaxy. Through magnetotransport measurements, clear Shubnikov-de Haas (SdH) oscillations are observed. Fourier-transformed spectra of the SdH oscillations exhibit four oscillation components. The observed SdH oscillations are fitted with Lifshitz-Kosevich formula and band parameters such as the relaxation time and mobility are obtained. By comparing the present results with a previous study, one of the observed SdH oscillations can be attributed to a Rashba-like surface state (RSS) of α-Sn with spin-polarization, which has never been observed in quantum transport measurements, in addition to those corresponding to the InSb, a bulk linear heavy hole (HH) and a topological surface state (TSS) of α-Sn. The obtained transport properties of the RSS, relaxation time (215 fs) and mobility (9400 cm2/Vs), are useful for spintronics application using the multiple α-Sn surface states with spin-polarization.
コメント
コメントの閲覧・投稿にはログインが必要です。ログイン