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Theoretical prediction of rotating magnon wavepacket in ferromagnets
Ryo Matsumoto, Shuichi Murakami
We theoretically show that the magnon wavepacket has a rotational motion in two ways; a self-rotation and a motion along the boundary of the sample (edge current). They are similar…
Kohn Anomalies in Graphene Nanoribbons
Ken-ichi Sasaki, Masayuki Yamamoto, Shuichi Murakami +6
The quantum corrections to the energies of the point optical phonon modes (Kohn anomalies) in graphene nanoribbons are investigated. We show theoretically that the longitudinal…
Quantum spin Hall phases
Shuichi Murakami
We review our recent theoretical works on the the quantum spin Hall effect. First we compare edge states in various 2D systems, and see whether they are robust or fragile against p…
Spin Hall Effect of Excitons
Shun-ichi Kuga, Shuichi Murakami, Naoto Nagaosa
Spin Hall effect for excitons in alkali halides and in Cu_2O is investigated theoretically. In both systems, the spin Hall effect results from the Berry curvature in k space, which…
Universal phase diagrams for the quantum spin Hall systems
Shuichi Murakami, Shun-ichi Kuga
We describe how the three-dimensional quantum spin Hall phase arises from the insulator phase by changing an external parameter. In 3D systems without inversion symmetry, a gapless…
Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
Shuichi Murakami
Phase transitions between the quantum spin Hall and the insulator phases in three dimensions are studied. We find that in inversion-asymmetric systems there appears a gapless phase…