Departmental Seminar

Atom-by-atom engineering of novel states of matter

Professor Cristiane Morais Smith
Institute for Theoretical Physics, Utrecht University, The Netherlands

Feynman’s original idea of using one quantum system that can be manipulated at will to simulate the behaviour of another more complex one has flourished during the last decades in the field of cold atoms. More recently, this concept started to be developed in nanophotonics and in condensed matter. In this talk, I will discuss a few recent experiments, in which 2D electron lattices were engineered on the nanoscale using STM manipulation of adatoms on the surface of copper. First, I will show that it is possible to control the geometry of the lattice and the orbital degrees of freedom by building different Lieb lattices. Then, I will show how to realize topological states of matter using the same procedure. We investigate the robustness of the zero modes in a breathing Kagome lattice, which is the first experimental realization of a designed electronic higher-order topological insulator, and the fate of the edge modes in a Kekule structure, upon varying the type of boundary of the sample. Finally, we will control the effective dimension of the electronic structure by creating a Sierpinski gasket, which has dimension D = 1.58. The realization of this first quantum fractal opens the path to electronics in fractional dimensions. In addition, our recent investigation of quantum transport in fractals by using photonic quantum simulators might shed some light on the issue of consciousness.

C. Morais Smith is a worldwide recognised researcher working on the theory of strongly-correlated systems. She was awarded the 2019 Emmy Noether Distinction of the European Physical Society, “for her outstanding contributions to the theory of condensed matter systems and ultracold atoms to unveil novel quantum states of matter" and the 2016 Dresselhaus Prize CUI Hamburg University, Senior scientist, “for her outstanding contribution to the understanding of topological phases in two-dimensional atomic and electronic systems”. Her research interests range from condensed-matter to cold-atom systems. In collaboration with experimental colleagues, her group has pioneered the realization of quantum fractals and higher-order topological states in electronic quantum simulators.

Date & time

Thu 2 Dec 2021, 7–8pm

Location

Via Zoom

Audience

Members of RSPE welcome

Contact

(02)61258224