Quantum oscillations in magnetically doped SmB$_{6}$

Quantum oscillation study on pure SmB$_{6}$ has revealed two-dimensional Fermi Surfaces in both crystalline (001) and (101) surface planes. On the (101) surface plane, only one area of Fermi surface is observed, consistent with theoretical prediction of surface state protected by time-reversal symmetry. It has been further predicted that for the system there is not only time reversal symmetry reservation but also crystalline mirror symmetry reservation that could give rise to protected surface states. By introducing magnetic impurities such as 1\% Fe or 1\% Ni into SmB$_{6}$, the magnetic ground state is altered and no longer has the time reversal symmetry. However, quantum oscillations are still observed for both Fe$_{x}$SmB$_{6}$ and Ni$_{x}$SmB$_{6}$ at higher field, the dispersive angular dependence of frequency will be discussed with comparison to SmB$_{6}$.