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Research – Quantum Experiment

Our understanding of quantum materials is far from complete. Accessing the underlying quantum states, their quasiparticles, and phenomenology requires advanced experiments. We focus on important experimental challenges involving out-of-equilibrium, using different probes, transport measurements, and devices.

Out-of-equilibrium conditions

Pump probe type experiments are performed with X-rays and neutrons

We are developing out-of-equilibrium experiments where quantum states are manipulated in situ in the laboratory and at large scale facilities such as the Spallation Neutron Source. This involves rapid changes in conditions to driving materials through phase transitions as well as manipulating quasiparticle such as skyrmions, magnetic monopoles, and magnons using applied magnetic and electric fields, pulsed currents, and lasers. The experiments provide fundamental insight important for the basic understanding of quantum phases and their stability and future spintronics and quantum devices.

Investigators: Takeshi Egami, Dustin Gilbert, Alan Tennant, Yishu Wang.

Quantum Probes

Scanning tunneling microscopy measures quantum materials with atomic resolution

To gain new insight into quantum effects in materials we use neutrons, photons, and electrons. These are the most powerful experimental probes available and provide complementary information on structure and dynamics. We pursue research programs in neutron scattering, photoelectron spectroscopy, and scanning, tunneling, and transmission electron microscopy.

Investigators: Takeshi Egami, Dustin A. Gilbert, Sergei Kalinin, Wonhee Ko, Norman Mannella, Alan Tennant, Yishu Wang, Hanno Weitering.

Quantum Transport

Correlated electrons can exhibit Berry phase-driven transport in a 2D Mott insulator.

Quantum transport is a fundamentally important property of quantum materials which connects quantum states to application. Interactions between electrons at the atomic and subatomic scales result in exotic quantum phenomena, such as interference, tunneling, quantum fluctuations, quantum entanglement, and topologically non-trivial behaviors. We study a wide range of topological and quantum transport properties of materials down to milli-Kelvin temperatures and at high fields

Investigators: Joon Sue Lee, Jian Liu, Yishu Wang

Quantum Devices

Quantum devices are developed as the building blocks for future technologies. We connect our fundamental research on materials, interfaces, and transport phenomena to make devices based on quantum quasiparticles and effects.

Investigators: Aziz Ahmedullah, Joon Sue Lee, Jian Liu