# Calendar

Topological crystalline insulators (TCI's) are a class of materials which can support non-trivial band topology protected by crystalline symmetry. Using analytic and numerical methods, we study the effect of bulk magnetic impurities on a TCI model believed to be realized by (Sn,Pb)Te alloys.

When the system bulk is insulating, gapless surface states are present whose

energetics are affected by the magnetic ordering on the surface, particularly when it breaks the mirror symmetry. This leads to a rich variety of ferromagnetic orderings, with the number of degenerate magnetization directions dependent on which surfaces are exposed and on the doping of those

surfaces. In particular we find metallic states with two-fold easy axes as well as ones with six

orientations on the (111) surface. The (001) surface by contrast hosts an 8-fold insulating state.

The nature of domain walls between different orderings has interesting consequences

for transport on the surfaces as well as the universality classes of thermal disordering

transitions.

Prof. Herb Fertig, University of Indiana

190 ESB

false## ICMT Seminar: "Magnetic Ordering on Topological Crystalline Insulator Surfaces"

Speaker |
(sign-up)
Prof. Herb Fertig, University of Indiana |
---|---|

Date: | 4/16/2018 |

Time: | 12 p.m. |

Location: | 190 ESB |

Sponsor: | Institute for Condensed Matter Physics |

Event Type: | Seminar/Symposium |

Topological crystalline insulators (TCI's) are a class of materials which can support non-trivial band topology protected by crystalline symmetry. Using analytic and numerical methods, we study the effect of bulk magnetic impurities on a TCI model believed to be realized by (Sn,Pb)Te alloys. |

To request disability-related accommodations for this event, please contact the person listed above, or the unit hosting the event.

## Event Mailing List

Receive Illinois Physics events weekly in your inbox.