DCMPMS Seminars
Disordered Quantum Spin-1/2 Chains
by Prof. Surjeet Singh (Indian Institute of Science Education and Research, Pune)
Monday, September 18, 2017
from
to
(Asia/Kolkata)
at AG69
at AG69
Description |
In this talk, I will show some experimental results concerning the effect of dilute disorder on the ground state and excitations of quantum spin 1/2 chains. The disorder is induced by doping either magnetic or nonmagnetic impurity in two representative Heisenberg spin 1/2 chain systems. The specific results that I will show include: (i) finite-size effects arising due to spin 0 or spin 1 impurities leading to gapping of the spin excitations; and (ii) anisotropic spin 1/2 impurities leading to Heisenberg to Ising crossover. |