Abstract：
Spin textures of electrons in quantum dots/rings and rings with Rashba or Dresselhaus spinorbit couplings reveal several intriguing topological properties in real space. We show that the topological spin textures appear in the ground states and excitation states in these systems. The textures are stabilized by time-reversal symmetry breaking and are robust against the eccentricity of the dot. The topological charge is directly related to the sign of the z component of the spin in a large dot, allowing a direct probe of its topological properties. The phenomenon of spin vortices persists for the quantum dot helium with Coulomb interaction in the presence of a magnetic field. The spin textures and the transport properties of quantum ring are also determined by the Aharonov-Bohm and Aharonov-Casher effects. We propose the spin polarizer and the spin analyzer in a simple way based on the studies of the spin transport of the quantum ring.
Biography：
Luo, Wenchen, Special-term professor at Central South University. Graduated from the Universite de Sherbrooke, and then joined University of Manitoba as a postdoc fellow. Currently working in the school of physics and electronics at Central South University since 2018. Research interests include integer/fractional quantum Hall effects, electron structures in nanoscale systems, transport properties of two-dimensional electron gas, and quantum optics associated with these systems. Have over ten publications as the first author or corresponding author. Have been invited as the reviewer of Physical Review, Canadian Journal of Physics and some other journals.
Seminar by the NYU-ECNU Institute of Physics at NYU Shanghai