Recently, higher-order topologies have been experimentally realized, featuring topological corner modes (TCMs) between adjacent topologically distinct domains. However, they have to comply with specific spatial symmetries of underlying lattices, hence their TCMs only emerge in very limited geometries, which significantly impedes generic applications. Here, we report a general scheme of inducing TCMs in arbitrary geometry based on Dirac vortices from aperiodic Kekul´e modulations... [Read More]
Biological ion channels rapidly and selectively gate ion transport through atomic-scale filters to maintain vital life functions. We report an atomic-scale ion transistor exhibiting ultrafast and highly selective ion transport controlled by electrical gating in graphene channels around 3 angstroms in height, made from a single flake of reduced graphene oxide... [Read More]
Research efforts of cavity quantum electrodynamics have focused on the manipulation of matter hybridized with photons under the strong coupling regime. This has led to striking discoveries including polariton condensation and single-photon nonlinearity, where the phonon scattering plays a critical role. However, resolving the phonon scattering remains challenging for its non-radiative complexity... [Read More]
Photonic quantum information processing, one of the leading platforms for quantum technologies, critically relies on optical quantum interference to produce an indispensable effective photon–photon interaction. However, such an effective interaction is fundamentally limited to bunching due to the bosonic nature of photons and the restricted phase response from conventional unitary optical elements... [Read More]
The interplay between chirality and magnetism generates a distinct physical process, the magneto-chiral effect, which enables one to develop functionalities that cannot be achieved solely by any of the two. Such a process is universal with the breaking of parity-inversion and time-reversal symmetry simultaneously. However, the magneto-chiral effect observed so far is weak when the matter responds to photons, electrons, or phonons... [Read More]
Tunneling plays an essential role in many branches of physics and has found important applications. It is theoretically proposed that Klein tunneling occurs when, under normal incidence, quasiparticles exhibit unimpeded penetration through potential barriers independent of their height and width. We created a phononic heterojunction by sandwiching two types of artificial phononic crystals with different Dirac point energies... [Read More]
The demand for essential pixel components with ever-decreasing size and enhanced performance is central to current optoelectronic applications, including imaging, sensing, photovoltaics and communications. The size of the pixels, however, are severely limited by the fundamental constraints of lightwave diffraction... [Read More]
In two-dimensional layered quantum materials, the stacking order of the layers determines both the crystalline symmetry and electronic properties such as the Berry curvature, topology and electron correlation. Electrical stimuli can influence quasiparticle interactions and the free-energy landscape, making it possible to dynamically modify the stacking order and reveal hidden structures that host different quantum properties. Here, we demonstrate electrically driven stacking transitions that can be applied to design non-volatile memory based on Berry curvature in few-layer WTe2... [Read More]
Ultrathin ferroelectric materials could potentially enable low-power perovskite ferroelectric tetragonality logic and nonvolatile memories. As ferroelectric materials are made thinner, however, the ferroelectricity is usually suppressed. Size efects in ferroelectrics have been thoroughly investigated in perovskite oxides—the archetypal ferroelectric system. Perovskites, however, have so far proved unsuitable for thickness scaling and integration with modern semiconductor processes... [Read More]
Heat transfer in solids is typically conducted through either electrons or atomic vibrations known as phonons. In a vacuum, heat has long been thought to be transferred by radiation but not by phonons because of the lack of a medium. Recent theory, however, has predicted that quantum fuctuations of electromagnetic felds could induce phonon coupling across a vacuum and thereby facilitate heat transfer... [Read More]
|N. Bachelard, C. Ropp, S. Yang, & X. Zhang, "Externally driven broadband transmission in strongly disordered materials." Applied Physics Letters, 118, 2021.|
|X. Wu, Y. Meng, Y. Hao, R.-Y. Zhang, J. Li, & X. Zhang, "Topological Corner Modes Induced by Dirac Vortices in Arbitrary Geometry." Physical Review Letters, 126, 2021.|
|Y. Xue, Y. Xia, S. Yang, Y. Alsaid, K. Y. Fong, Y. Wang, & X. Zhang, "Atomic-scale ion transistor with ultrahigh diffusivity." Science, 372, 2021.|
|X. Liu, J. Yi, S. Yang, E.-C. Lin, Y.-J. Zhang, P. Zhang, J.-F. Li, Y. Wang, Y.-H. Lee, Z.-Q. Tian, & X. Zhang, "Nonlinear Valley Phonon Scattering Under the Strong Coupling Regime." Nature Materials, , 2021.|
|S. Lan, X. Liu, S. Wang, H. Zhu, Y. Liu, C. Gong, S. Yang, J. Shi, Y. Wang, & X. Zhang, "Observation of strong excitonic magneto-chiral anisotropy in twisted bilayer van der Waals crystals." Nature Communications, 12, 2021.|
Nov 2020: Dr. Sui Yang has been selected as the final winner of Rising Stars of Light 2020.
Jul 2020: Our lab alumnus Dr. Haokun Li has won the Award for Chinese Outstanding Self-financed Students Abroad.
Jul 2020: Dr. Sui Yang has won Microsystem & Nanoengineering Young Scientist Award.
Jul 2020: Our lab alumnus Prof. Cheng Gong has won IUPAP Young Scientst Prize in Semiconductor Physics of 2020.
Dec 2019: Our lab alumnus Prof. Junsuk Rho has won Korean PECASE Award.