| Budget Amount *help |
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
The topological insulator is a new type of insulator. Let us consider a simple model which has the trivial Chern number because of time-reversal symmetry. Even if the total Chern number is zero, there is the case where each spin sector, if such a division is possible, has a nontrivial Chern number. Thus, vanishing Chern number does not necessarily mean that the system is topologically trivial.
Motivated by such an observation, we have started our research by proposing and analyzing a super lattice model which is a layered system with opposite Chern numbers. To understand unique properties of the model in spite of the vanishing Chern number, we have invented a new topological number "entanglement Chern number". It has turned out that such a new number is successfully applied to the description of generic topological phases of the systems.
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