| Budget Amount *help |
¥19,760,000 (Direct Cost: ¥15,200,000、Indirect Cost: ¥4,560,000)
Fiscal Year 2014: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2013: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2012: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
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| Outline of Final Research Achievements |
We have developed an experimental method which enables us to measure the sheet conductivity of metallic monolayers on semiconductor surfaces for a temperature range of 5-300 K at a precision much higher than the previous methods. By using this new method in a 7-probe arrangement, we carried out a precise examination of the spin-polarized current hypothesis proposed by Silsbee for 2D Rashba electron systems. By a careful measurement, we concluded that the hypothesis is invalid.
We also studied by a 4-probe method the temperature dependence of the sheet conductivity of a Pb monolayer on Ge(111). We found that the sheet conductivity at 10 K is more than an order of magnitude larger than those of known metallic monolayers, and that the step conductivity is two orders of magnitude larger. We also found subsurface electronic states ubiquitously formed on Ge(111) covered with different elements, which is spin-split by the Rashba effect.
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