[18p-D61-1~21] 10.4 Spintronics in semiconductor, topological material, superconductor, and multiferroics

6:30 PM - 6:45 PM JST(9:30 AM - 9:45 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[18p-D61-21] Observation of bulk and multiple surface states in a thick topological Dirac semimetal α-Sn film by quantum transport

〇Hideki Maki¹, Tomoki Hotta¹, Soichiro Fukuoka¹, Le Duc Anh^1,2, Masaaki Tanaka^1,2 (1.EEIS, Univ. of Tokyo, 2.CSRN, Univ. of Tokyo)

Keywords:

topological Dirac semimetal,alpha-tin,quantum oscillation

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.