A5009400608- Graphene research and applications
- Quantum and electron transport phenomena
- Topological Materials and Phenomena
- Physics of Superconductivity and Magnetism
- 2D Materials and Applications
- Surface and Thin Film Phenomena
- Advanced Condensed Matter Physics
- Silk-based biomaterials and applications
- Complex Systems and Time Series Analysis
- Thermal properties of materials
- Fractal and DNA sequence analysis
- Quantum many-body systems
- Advanced Mathematical Theories and Applications
- Quantum Information and Cryptography
- Advanced Physical and Chemical Molecular Interactions
- Theoretical and Computational Physics
- Chalcogenide Semiconductor Thin Films
Princeton University
2021-2025
University of California, Berkeley
2020-2022
Interactions among electrons create novel many-body quantum phases of matter with wavefunctions that often reflect electronic correlation effects, broken symmetries, and collective excitations. A wide range has been discovered in MATBG, including correlated insulating, unconventional superconducting, magnetic topological phases. The lack microscopic information, precise knowledge possible thus far hampered our understanding MATBG's Here we use high-resolution scanning tunneling microscopy to...
Abstract The unusual properties of superconductivity in magic-angle twisted bilayer graphene (MATBG) have sparked considerable research interest 1–13 . However, despite the dedication intensive experimental efforts and proposal several possible pairing mechanisms 14–24 , origin its remains elusive. Here, by utilizing angle-resolved photoemission spectroscopy with micrometre spatial resolution, we reveal flat-band replicas superconducting MATBG, where MATBG is unaligned hexagonal boron...
We analytically compute the scanning tunneling microscopy (STM) signatures of integer-filled correlated ground states magic angle twisted bilayer graphene (TBG) narrow bands. After experimentally validating strong-coupling approach at ±4 electrons/moiré unit cell, we consider spatial features STM signal for 14 different many-body and assess possibility Kekulé distortion (KD) emerging lattice scale. Remarkably, find that coupling two opposite valleys in intervalley-coherent (IVC) TBG...
Hofstadter's butterfly, the predicted energy spectrum for non-interacting electrons confined to a two-dimensional lattice in magnetic field, is one of most remarkable fractal structures nature. At rational ratios flux quanta per unit cell, this shows self-similar distributions levels that reflect its recursive construction. For materials, butterfly under experimental conditions are unachievable using laboratory-scale fields. More recently, electrical transport studies have provided evidence...
The unusual properties of superconductivity in magic-angle twisted bilayer graphene (MATBG) have sparked enormous research interest. However, despite the dedication intensive experimental efforts and proposal several possible pairing mechanisms, origin its remains elusive. Here, using angle-resolved photoemission spectroscopy with micrometer spatial resolution, we discover replicas flat bands superconducting MATBG unaligned hexagonal boron nitride (hBN) substrate, which are absent...
The interplay between electron-electron interactions and structural ordering can yield exceptionally rich correlated electronic phases. We have used scanning tunneling microscopy to investigate bulk 1T-TaSe2 uncovered surprisingly diverse surface states thereof. These exhibit the same in-plane charge density wave but dramatically different ground ranging from insulating metallic. variety of state shows signatures a decoupled Mott layer. metallic states, on other hand, zero-bias peaks varying...
At partial fillings of its flat electronic bands, magic-angle twisted bilayer graphene (MATBG) hosts a rich variety competing correlated phases that show sample-to-sample variations. Divergent phase diagrams in MATBG are often attributed to the sublattice polarization energy scale, tuned by degree alignment hexagonal boron nitride (hBN) substrates typically used van der Waals devices. Unaligned exhibits unconventional superconductor and insulator phases, while nearly perfectly aligned...
At partial fillings of its flat electronic bands, magic-angle twisted bilayer graphene (MATBG) hosts a rich variety competing correlated phases that show sample to variations. Divergent phase diagrams in MATBG are often attributed the sublattice polarization energy scale, tuned by degree alignment hexagonal boron nitride (hBN) substrates typically used van der Waals devices. Unaligned exhibits unconventional superconductivity and insulating phases, while nearly perfectly aligned MATBG/hBN...