Home| 題 目 | Tailoring of Spin-Split Metallic Surface States of 2D Alloys and Compounds on Silicon |
| 講 師 | Alexander A. Saranin（Institute of Automation and Control Processes, Vladivostok, Russia） |
| 日 時 | 2015年11月13日（金）16：30- |
| 場 所 | 理学研究科C212会議室 |
| 要 旨 | In the present study, we propose a strategy for tailoring the spin-split metallic surface states on. The main concept resides in taking the surfaces with spin-split non-metallic surface-state bands and by alloying them with suitable metals to obtain dense reconstructions with spin-split metallic bands. Validity of the approach is demonstrated with Bi/Si(111)√3�√3 alloyed with Na and Tl/Si(111)1�1 alloyed with Pb [1]. Recent results of the development of this approach are demonstrated on the formation of a number of 2D alloys and compounds on the Si(111) surface with metallic spin split states: (i) sandwichlike structure made of one monolayer of Tl and one monolayer of Sn on Si(111) [2], (ii) TlxBi1−x compound which represents a quasi-periodic tiling structures that are built by a set of tiling elements as building blocks and (iii) Si(111)2�2-(Au,Al) with unusual spin texture. We demonstrated that one atom layer Si(111)√3�√3-Tl,Pb exhibits a giant Rashba-type spin splitting of metallic surface-state bands together with two-dimensional superconductivity [3]. REFERENCES 1.D. V. Gruznev, et al. Sci. Rep. 4, 04742–5, (2014). 2.D. V. Gruznev, et al. Phys. Rev. B 91, 035421–7, (2015). 3.A. V. Matetskiy, et al. Phys. Rev. Lett. 115, 147003-5, (2015). |
| 担 当 | 木村昭夫（理学研究科） |
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