室温下从可见光到太赫兹的超宽带光敏性
Ultrabroadband photosensitivity from visible to terahertz at room temperature
摘要：
电荷密度波是固体中最基本的量子现象之一。与普通金属中仅存在单粒子激发不同，CDW还具有集体激发，并且可以集体方式携带电流。操纵这种集体凝聚的应用一直是凝聚态物质和材料界的目标。在这里，我们表明，CDW系统的1 T-TaS 2是高度敏感的光直接从可见光到太赫兹，在室温下的电流响应度约为1 AW-1的顺序。我们的研究结果为实现连续到太赫兹光谱范围的非制冷，超宽带和敏感光电子学开辟了一条新途径。
英文摘要：
Charge-density wave (CDW) is one of the most fundamental quantum phenomena in solids. Different from ordinary metals in which only single particle excitations exist, CDW also has collective excitations and can carry electric current in a collective fashion. Manipulating this collective condensation for applications has long been a goal in the condensed matter and materials community. Here we show that the CDW system of 1T-TaS2 is highly sensitive to light directly from visible down to terahertz, with current responsivities around the order of ~1 AW-1 at room temperature. Our findings open a new avenue for realizing uncooled, ultrabroadband and sensitive photoelectronics continuously down to terahertz spectral range.
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