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2D Quantum Materials
2D Quantum Materials
We leverage two-dimensional (2D) quantum materials as a platform to explore exotic quantum states. Our focus lies on van der Waals (vdW) layered materials, which offer unprecedented opportunities to engineer artificial atomic structures that are challenging to achieve with traditional methods.
Research Areas:
Moiré band structures
Investigating the unique electronic properties arising from the superlattice potentials in twisted 2D heterostructures.
Quasicrystals
Studying the electronic properties of non-periodic structures in 2D materials and exploring their potential.
Topological superconductivity
Exploring topological superconducting states that is expected to host Majorana quasiparticles, bridging condensed matter physics and quantum computing.
Non-trivial topology
Examining materials such as topological insulators, magnetic topological insulators, Weyl semimetals, which exhibit robust surface states immune to perturbations.
Many-body effects
Analyzing interactions like band renormalization, Coulomb screening effects and Mott transitions that significantly influence the electronic and optical behaviors of 2D systems.
"Exotic quantum states in 2D quantum materials"
"Layer-by-layer disentanglement of Bloch wavefunctions using coherent phonons"
Light-induced quantum phenomena
Light-induced quantum phenomena
We study quantum phenomena induced by lights, aiming to understand and manipulate these effects for practical applications. Our research encompasses the following topics:
Electron-coherent phonon interactions
Exploring the coupling between electrons and lattice vibrations, and how light can coherently control these interactions.
Exciton physics
Studying the behavior of excitons, electron-hole pairs, under light excitation and their roles in conjunction with light-matter interactions.
Electron dynamics in unoccupied and occupied states
Analyzing how electrons behave after photoexcitation in both filled and empty electronic states, providing insights into material's electrical and optical properties.
Quantum phase transitions
Investigating quantum phase transition induced by lights, offering pathways to novel states of matter.
Floquet physics
Examining systems under periodic light fields, leading to time-averaged Hamiltonians and new phases of matter.
"Gold-mediated large-area monolayer exfoliation and transfer techniques"
Gold-mediated large-area monolayer exfoliation
Gold-mediated large-area monolayer exfoliation
Gold-mediated large-area exfoliation is a technique that enables the extraction of monolayer samples larger than 1 × 1 mm² from bulk single crystals. This method offers significant advantages for various experimental applications, including angle-resolved photoemission spectroscopy (ARPES) and time-resolved ARPES measurements, terahertz optical measurements, patterning and photonics all of which which benefit from the availability of large-area monolayer samples.
Additionally, this technique facilitates the creation of van der Waals heterostructures using large monolayer samples. By cutting the prepared monolayers with scissors and stacking them at specific twist angles, we can engineer desired structural configurations with ease.
Instrument development
Instrument development
We dedicate our efforts to the development of custom-designed ultra-high vacuum (UHV) systems for material characterization and synthesis.
"A 6eV time-resolved ARPES system developed by Prof. Lee during his Ph.D. studies at University of Texas at Austin"
Lee et al., Nano Letters 22 (19), 7841-7847 (2022)
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