Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.166801
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [17071007, 17071005, 19048015, 19048008]
- JSPS
- Grants-in-Aid for Scientific Research [17071007] Funding Source: KAKEN
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We study theoretically the reflection problem in the junction between a normal metal and an insulator characterized by a parameter M, which is a usual insulator for M > 0 or a quantum-spin-Hall system for M < 0. The spin rotation angle alpha at the reflection is obtained as a function of M and the incident angle theta measured from the normal to the interface. The alpha shows rich structures around the quantum critical point M=0 and theta=0; i.e., alpha can be as large as similar to pi at an incident angle in the quantum spin Hall case M < 0 because the helical edge modes resonantly enhance the spin rotation, which can be used to map the energy dispersion of the helical edge modes. As an experimentally relevant system, we also study the spin rotation effect in quantum-spin-Hall-normal-metal-quantum-spin-Hall trilayer junction.
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