- Focuses on emergent quantum phenomena, primarily those that arise because of the interaction between electrons or the topological properties of their wavefunctions in materials. Such phenomena are at the frontiers of expanding our understanding of quantum materials.
- Specializes in both the development and application of quantum microscopy and spectroscopy to visualize and characterize the nature of such correlated and topological quantum states with high spatial and energy resolution.
- Focuses on developing quantum microscopy techniques to perform measurements that were previously not possible and to direct these advanced capabilities towards the most current questions in condensed matter physics.
Current Research Projects
Stacks of 2D van der Waals monolayer materials represent a new platform for the realization of correlated and topological electronic states...(read more.)
Majorana fermions are quasiparticles that are the condensed matter analogs of exotic particles first proposed by Ettore Majorana as neutral free fermions that are their own antiparticle. Their emergence in a condensed matter setting...(read more.)
Ever since the isolation of single-atom-thick graphene an ever-growing number of two-dimensional (2D) atomic crystals have been created. These 2D atomic crystals have properties that are very different from their 3D bulk crystals...(read more)
Landau Orbits: We imaged Landau orbit wavefunctions in quantum Hall phases using our ultra-high vacuum... Anyons: We extended STM imaging of Landau levels in an integer quantum Hall... (read more.)
Techniques and Instrument Development
Our UHV, millikelvin ultra-low temperature scanning tunneling microscope (ULT-STM) came online March 2019. Its modular design... (read more.)
We are developing a new capability to perform atomic force microscopy (AFM) techniques for device-like structures at millikelvin temperatures. AFM measurements...(read more.)
The Unisoku USM1300 Scanning Tunneling Microscope (STM) is capable of operating below 400 millikelvin and with a vector magnetic field of 2-2-9 T in X-Y-Z directions... (read more)
Recent Research Projects
The first example of a topological phase of matter is that of integer quantum Hall states, which are characterized by a topological gap in the bulk and the formation of topological boundary modes. Quantum Hall phases with multicomponent electronic degree of freedom, such as valley or layered systems, bring additional…
Topological phases are not limited to gapped systems, sparking theoretical prediction that there can be metallic phases or nodal superconductors with...exotic quasiparticles...(read more)
Topological insulators (TIs) distinguish themselves from ordinary insulators by hosting boundary modes, such as surface states in 3D TIs and... (read more).
We have directly visualized how interactions between electrons can give rise to emergent heavy quasiparticles... (read more).
We were the first to develop high-resolution spectroscopy as a function of temperature on high-Tc cuprates... (read more).