Japanese | English (Top page)
|Date and time:||17th September (Tue.) 15:00`|
|Place:||University of Hyogo, Lecture room (room 739) 7F|
|Title:||Self-Masking of Spontaneous Symmetry Breaking in Layer Materials|
|Speaker:||Dr. Hiroyuki Yamase@(NIMS)|
We study d-wave Fermi-surface deformations (dFSD), the so-called Pomeranchuk instability, on bilayer and infinite-layer square lattices. Since the order parameter of the dFSD has Ising symmetry, there are two stacking patterns along the c axis: (+, +) and (+, -). We find that, as long as the c axis dispersion is finite at the saddle points of the in-plane band dispersion, the (+, -) stacking is usually favored independently on the details of interlayer coupling, yielding no macroscopic anisotropy. The dFSD provides unique spontaneous symmetry breaking that is self-masked in layer materials.
 H. Yamase: Phys. Rev. Lett. 102, 116404 (2009).