Research Area

Twistronics 

The ability to isolate individual layers of 2D materials and stack them on top of each other has opened up exciting new possibilities. These materials come in various forms, such as metals, insulators, and superconductors, and can be combined like building blocks, much like Lego. This has created a new field called “van der Waals heterostructures.” Unlike traditional methods where changing the material’s properties requires altering its chemical composition, 2D materials can be engineered by stacking layers in specific ways to control their electronic properties. Our group focuses on studying these unique systems and finding ways to control their behavior for practical applications.

Electron Hydrodynamics

In ultra-clean devices, the simple assumption that electrons behave independently breaks down, and instead, electrons move together like a fluid, similar to water. Recent advances have come from studying highly interactive quantum materials, such as graphene. In these materials, electrons can collide more with each other than with impurities or other obstacles, creating a collective flow like honey. Our group is exploring this "hydrodynamic regime" in various materials, focusing on how factors like high Reynolds number and turbulence affect electronic resistance. We’re also investigating how unique spatial patterns form in these materials using advanced scanning techniques.

Scanning probe technique

Inspired by the field of Twistronics, our group is developing a novel scanning tool - Quantum Twisting Microscope (QTM). The QTM will be capable of performing momentum-resolved scanning. The same tool in a different modality can be used for imaging electron flow in real space and performing pressure-dependent electrical transport. Direct visualization of electrons in real space and measuring their electronic dispersion in real space will provide new insights into quantum materials.

1/f noise

For practical applications like sensors and electronics, emerging materials require a high signal-to-noise ratio. However, low-frequency noise in electronic devices presents a significant challenge. As van der Waals heterostructures show promising properties such as ferromagnetism, superconductivity, and correlated states, understanding and controlling noise becomes crucial for their use in real-world technologies. Our group is investigating low-frequency noise in various 2D materials through different device architectures to understand its mechanisms and find ways to minimize it.

Memory devices

Ferroelectric memory devices leverage the unique properties of ferroelectric materials, which can retain information through electric polarization. By combining these materials with transition metal dichalcogenides (TMDCs) in their 2D form, we can create memory devices that are faster, more energy-efficient, and have higher scalability. The 2D TMDCs offer excellent control over the ferroelectric switching behavior, making them ideal for next-generation non-volatile memory applications. Our group is exploring these novel 2D ferroelectric memory devices to push the boundaries of data storage technology.