GeSn alloys have emerged as a promising material for realizing CMOS-compatible light sources. GeSn lasers demonstrated to date have large device footprints and active areas, which limit the realization of densely integrated lasers operating at low power consumption. Thanks to their intrinsically small device form factors, 1D photonic crystal lasers may offer opportunities to overcome such limitations of large GeSn lasers. Here, we present a 1D photonic crystal nanobeam laser with a very small device footprint (~7 μm2) and a compact active area (~1.2 μm2) on a GeSn-on-insulator substrate.
Pseudo-magnetic field in strained graphene has emerged as a promising route to allow observing intriguing physical phenomena that would be inaccessible with laboratory superconducting magnets. However, experimental observation of the impact of pseudo-magnetic field on optical and electrical properties of graphene has remained unknown. Here, using time-resolved infrared pump-probe spectroscopy, we provide unambiguous evidence of slow carrier dynamics enabled by a giant pseudo-magnetic field (~100 T) in periodically strained graphene. Our finding presents unforeseen opportunities towards harnessing the new physics of graphene in previously unachievable high magnetic field regimes.
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