Engineering the electronic band structure of material systems enables the unprecedented exploration of new physical properties that are absent in natural or as-synthetic materials. Half metallicity, an intriguing physical property arising from the metallic nature of electrons with singular spin polarization and insulating for oppositely polarized electrons, holds a great potential for a 100% spin-polarized current for high-efficiency spintronics... [Read More]
Asymmetric light transport has significantly contributed to fundamental science and revolutionized advanced technology in various aspects such as unidirectional photonic devices, optical diodes, and isolators. While metasurfaces mold wave fronts at will with an ultrathin flat optical element, asymmetric transport of light cannot be fundamentally achieved by any linear system including linear metasurfaces... [Read More]
Metal-halide perovskites have long carrier diffusion lengths, low trap densities and high carrier mobilities, and are therefore of value in the development of photovoltaics and light-emitting diodes. However, the presence of thermally activated carriers in the materials leads to high noise levels, which limits their photodetection capabilities... [Read More]
Out-of-plane ferroelectricity with a high transition temperature in ultrathin films is important for the exploration of new domain physics and scaling down of memory devices. However, depolarizing electrostatic fields and interfacial chemical bonds can destroy this long-range polar order at two-dimensional (2D) limit... [Read More]
Self-organized criticality emerges in dynamical complex systems driven out of equilibrium and characterizes a wide range of classical phenomena in physics, geology, and biology. We report on a quantum coherence–controlled self-organized critical transition observed in the light localization behavior of a coherence-driven nanophotonic configuration... [Read More]
Chirality reveals symmetry breaking of the fundamental interaction of elementary particles. In condensed matter, for example, the chirality of electrons governs many unconventional transport phenomena such as the quantum Hall effect. Here we show that phonons can exhibit intrinsic chirality in monolayer tungsten diselenide... [Read More]
We demonstrate that it is possible to localize photons nonreciprocally in a moving photonic lattice made by spatiotemporally modulating the atomic response, where the dispersion acquires a spectral Doppler shift with respect to the probe direction. A static defect placed in such a moving lattice produces a spatial localization of light in the band gap with a shifting frequency that depends on the direction of incident field with respect to the moving lattice... [Read More]
There has recently been a surge of interest in the physics and applications of broadband ultraslow waves in nanoscale structures operating below the diffraction limit. They range from light waves or surface plasmons in nanoplasmonic devices to sound waves in acoustic-metamaterial waveguides, as well as fermions and phonon polaritons in graphene and van der Waals crystals and heterostructures... [Read More]
Monolayers of transition-metal dichalcogenides (TMDs) exhibit numerous crystal phases with distinct structures, symmetries and physical properties. Exploring the physics of transitions between these different structural phases in two dimensions may provide a means of switching material properties, with implications for potential applications... [Read More]
|S.-J. Gong, C. Gong, Y.-Y. Sun, W.-Y. Tong, C.-G. Duan, J.-H. Chu & X. Zhang, "Electrically induced 2D half-metallic antiferromagnets and spin field effect transistors." PNAS, AOP, 2018.|
|N. D. Lanzillotti-Kimura, K. P. O’Brien, J. Rho, H. Suchowski, X. Yin & X. Zhang, "Polarization-controlled coherent phonon generation in acoustoplasmonic metasurfaces." Physical Review B, 97, 2018.|
|N. Shitrit, J. Kim, D. S. Barth, H. Ramezani, Y. Wang & X. Zhang, "Asymmetric Free-Space Light Transport at Nonlinear Metasurfaces." Physical Review Letters, 121, 2018.|
|Y. D. Jang, J. S. Baek, V. Devaraj, M. D. Kim, J. D. Song, Y. Wang, X. Zhang & D. Lee, "Deterministic coupling of epitaxial semiconductor quantum dots to hyperbolic metamaterial." Optica, 5, 2018.|
|M. S. Eggleston, S. B. Desai, K. Messer, S. A. Fortuna, S. Madhvapathy, J. Xiao, X. Zhang, E. Yablonovitch, A. Javey & M. C. Wu, "Ultrafast Spontaneous Emission from a Slot-Antenna Coupled WSe2 Monolayer." ACS Photonics, AOP, 2018.|
Apr 2018: Ying has won 2018 MRS Graduate Student Gold Award.
Apr 2018: Chengzhi and Jun have won 2017 Chinese Government Award for Outstanding Self-financed Students Abroad.
Feb 2018: Our lab alumni Prof. Nicholas Fang has been promoted to full professor at MIT.
Nov 2017: Our lab alumni Prof. Xiaobo Yin has been elected as a Moore Inventor Fellow.
Jul 2017: Sui has been selected as 2017 Reaxys Prize Finalist.