鎶ュ憡棰樼洰錛?D negative electronic compressibility in perovskite iridates
銆€銆€鎶ュ憡浜猴細Rui-Hua He (浣曠澘鍗?
銆€銆€鍦扮偣錛氭牸鑷翠腑妤?00
銆€銆€鏃墮棿錛?018騫?鏈?鏃ワ紙鏄熸湡涓€錛変笂鍗?0:30
銆€銆€鎶ュ憡鎽樿錛欰 central theme of modern condensed matter physics is to understand old and discover new emergent phenomena in quantum materials. These phenomena emerge through the collective behavior of electrons due to their mutual interactions (correlations). In this talk, I will present evidence for the first experimental cases of a new emergent phenomenon in solids鈥?D negative electronic compressibility. The occurrences of this phenomenon in two perovskite iridate systems are understood to be driven by the electron correlations that are intimately connected with the antiferromagnetism and pseudogap phenomena. All these phenomena in the systems are shown to derive from a special insulating phase in a way that resembles the classic metal-insulator transitions seen on the 2D electron/hole gases in semiconductor heterostructures. Our finding opens the door to an uncharted territory of negative compressibility research that potentially features a whole variety of bulk quantum materials and promises unique applications in low-power nanoelectronics and novel metamaterials.
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鐞嗗闄?
2018騫?鏈?鏃?/p>
