Apr 23, 2024
1:30pm - 2:00pm
Room 448, Level 4, Summit
Susanne Stemmer1,Binghao Guo1,Alexander Lygo1,Wangqian Miao1,Xi Dai2
University of California, Santa Barbara1,The Hong Kong University of Science and Technology2
Susanne Stemmer1,Binghao Guo1,Alexander Lygo1,Wangqian Miao1,Xi Dai2
University of California, Santa Barbara1,The Hong Kong University of Science and Technology2
In this talk, we will discuss two-dimensional topological states in high-quality thin films of cadmium arsenide (Cd<sub>3</sub>As<sub>2</sub>) grown by molecular beam epitaxy. Cd<sub>3</sub>As<sub>2</sub> is known to belong to a class of topological materials known as three-dimensional Dirac semimetals, but, as we will discuss in this presentation, in thin films it can be tuned between a variety of topological phases. We will discuss the evolution of the electronic states of Cd<sub>3</sub>As<sub>2</sub> films as their thickness is scaled. We also discuss a two-dimensional Weyl semimetal phase that is obtained under applied in-plane magnetic fields. We show that magnetotransport studies can distinguish between the different topological phases.