**NJIT Physics
Department Seminar**

**December 15, Thursday (*SPECIAL DAY*) **

**Topological Materials: **

**The Story behind the 2016
Physics Nobel Prize**

**Prof. Emil Prodan**

Physics
Department, Yeshiva University

(Condensed Matter &
Biophysics, Host: Thomas)

***TALK*: Tiernan 409, 11:30am - 12:30pm **

**(* SPECIAL
TIME/ROOM and NO TEA TIME *)**

***LUNCH*:
Tiernan 406, 12:30pm - 4pm**

**Abstract**:

Topology
is a branch of mathematics which classifies objects and spaces by the way they
can continuously deform into each other. Its principles can be applied to the
quantum states of the electron and such ideas were pioneered in condensed
matter physics by Duncan Haldane, this year's Nobel laureate. These days, the
topological principles drive the discovery in materials science and new classes
of materials were discovered almost every year in the past decade. Examples
are: quantum spin-Hall insulators, 3D topological insulators, crystalline
topological insulators, point group topological insulators, anomalous quantum
Hall insulators, Weyl and Dirac semi-metals, topological photonic and acoustic
crystals, topological quasicrystals, topological amorphous materials. The
common feature of all these crystals is the emergence of robust wave-channels
along any surface cut into the crystals. These channels cannot be destroyed by
any surface-treatment and the waves propagates without dissipation. In this
talk I will introduce the topological principles and then discuss the
foundational works of Haldane. For the remaining part, I will present the
theoretical and experimental status quo for each of the topological classes.