TheoryLab
Our article was published in ACS NANO and features on the cover of the September issue! Congratulations to Yuanxi, Sha and Xue, great work!!
Emergence of Debye Scaling in the Density of States of Liquids under Nanoconfinement | ACS Nano
Xu Yang (许阳) joined our TheoryLab group as a master student ad he will do research on soft matter theory. Welcome to the group Xu !!!
The twisted bilayer graphene (TBG) system is one of the important discoveries in condensed matter physics in recent years. It has become an extremely rich platform for studying quantum many-body physics. Especially at a specific twist angle, the so-called “magic angle” (approximately 1.05 degrees), TBG undergoes a superconducting phase transition. Although the origin of exotic superconductivity in TBG remains a controversial topic, it is generally believed that the flat-band effect plays an essential role. However, since TBG is not a stable configuration at the magic angle, it is often difficult to accurately prepare magic-angle graphene experimentally. Experiments have observed that when the twist angle deviates from the magic angle by 0.1 degrees, the superconducting phase disappears. This instability has limited extensive research on superconducting properties in TBG.
In this study, the researchers proposed a new method, namely, using quantum fluctuations in a chiral microcavity to engineer the band structure of TBG, so that TBG can form a flat band beyond the magic angle. The physical picture is that the chiral microcavity breaks time-reversal symmetry, and the vacuum quantum fluctuations in the cavity inherit the characteristics of time-reversal symmetry breaking. The time-reversal symmetry broken quantum fluctuations can induce energy gaps in the band structure, leading to a significant impact on the band flatness near the magic angle. By controlling the effective mode volume of the chiral microcavity, one can effectively tune the coupling strength of electron-photon interaction, achieving precise control of the band structure and even topological properties of the system. This work is based on the previous studies on the quantum atmospheric effect and the chiral vacuum molecule selection effect.
Cunyuan Jiang, Matteo Baggioli, and Qing-Dong Jiang, Phys. Rev. Lett. 132, 166901 (2024)
Jimin joined our group as a PhD student, welcome to the gang!!
Bowen Ouyang (欧阳博文) joined our TheoryLab group as an undergraduate student working on applied holography! Welcome Bowen!
Can we make a system that breaks time-translations spontaneously — a time crystal — as an ordinary crystal does with spatial translations? Yes!
Can we make this time crystal holographic and embed it in a gravitational solution with a black hole? Yes!
Check our new PRL work: Phys. Rev. Lett. 131, 221601
Peng Yang will join our research team in September 2023, welcome to the group!!!
Professor Matteo Baggioli (STJU and WQC) summarizes the recent breakthroughs in the search of topological defects in amorphous materials in a News and Views commentary for Nature Communications.
Sha and Xue joined our research team, welcome to the group!!!
Kyoung-Bum will join our group from September 2023 as a postdoctoral fellow. Welcome to the group!!
