Zhang Lab | UC Berkeley

Web Name: Zhang Lab | UC Berkeley

WebSite: http://xlab.me.berkeley.edu





ABOUT We are a highly interdisciplinary research group in nanoscience and engineering, with expertise in optical and electrical measurements, material synthesis, and theoretical modeling. Our research has primarily focused on the interaction of light with nanostructures, leading to exotic electromagnetic properties not found naturally. These phenomena have plentiful applications in photonics, imaging, energy, and others. Subwavelength pixelated CMOS color sensors based on anti-Hermitian metasurface Nature Communications, Aug 2020 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] Berry curvature memory through electrically driven stacking transitions Nature Physics, Jun 2020 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] Enhanced ferroelectricity in ultrathin films grown directly on silicon Nature, Apr 2020 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] Phonon heat transfer across a vacuum through quantum fluctuations Nature, Dec 2019 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] Topological kink plasmons on magnetic-domain boundaries Nature Communications, Oct 2018 Two-dimensional topological materials bearing time reversal-breaking magnetic fields support protected one-way edge modes. Normally, these edge modes adhere to physical edges where material properties change abruptly. However, even in homogeneous materials, topology still permits a unique form of edge modes – kink modes – residing at the domain boundaries of magnetic fields within the materials... [Read More] Observation of Rydberg exciton polaritons and their condensate in a perovskite cavity PNAS, Sept 2019 The condensation of half-light half-matter exciton polaritons in semiconductor optical cavities is a striking example of macroscopic quantum coherence in a solid-state platform. Quantum coherence is possible only when there are strong interactions between the exciton polaritons provided by their excitonic constituents.Rydberg excitons with high principal value exhibit strong dipole– dipole interactions in cold atoms... [Read More] Oblique-plane single-molecule localization microscopy for tissues and small intact animals Nature Methods, Aug 2019 Single-molecule localization microscopy (SMLM), while well established for cultured cells, is not yet fully compatible with tissue-scale samples. We introduce single-molecule oblique-plane microscopy (obSTORM), which by directly imaging oblique sections of samples with oblique light-sheet illumination offers a deep and volumetric SMLM platform that is convenient for standard tissue samples and small intact animals... [Read More] Multiferroicity in atomic van der Waals heterostructures Nature Communications, Jun 2019 Materials that are simultaneously ferromagnetic and ferroelectric – multiferroics – promise the control of disparate ferroic orders, leading to technological advances in microwave magnetoelectric applications and next generation of spintronics. Single-phase multiferroics are challenged by the opposite d-orbital occupations imposed by the two ferroics, and heterogeneous nanocomposite multiferroics demand ingredients’ structural compatibility with the resultant multiferroicity exclusively at inter-materials boundaries... [Read More] Stable Casimir equilibria and quantum trapping Science, Jun 2019 The Casimir interaction between two parallel metal plates in close proximity is usually thought of as an attractive interaction. By coating one object with a low–refractive index thin film, we show that the Casimir interaction between two objects of the same material can be reversed at short distances and preserved at long distances so that two objects can remain without contact at a specific distance... [Read More] 3112 ETCHEVERRY HALL, BERKELEY, CA 94720-1740 PHONE: (510)-642-0390 | FAX: (510)-643-2311

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Xiang Zhang, UC Berkeley

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