Ionic gating drives correlated insulator–metal transition
Ionic gating drives correlated insulator–metal transition
复制标题
离子门控驱动相关绝缘体-金属转变
DOI：
10.1073/pnas.1812913115
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Rappe, Andrew M.
中科院分区：
文献类型：
--
作者：
Rappe, Andrew M.
物质传输是现代凝聚态物理学的核心。电子传输至关重要，它实现了计算机通信并在询问材料反应方面发挥着关键作用。根据电子传导性，物质的主要分类为金属、半导体和绝缘体，而电子方面的考虑支撑着当前纳米材料革命 (1)。输运异常激发了科学家、工程师和公众的想象力，从巨磁阻 (2) 和巨磁阻 (3)、整数 (4) 和分数 (5) 量子霍尔效应到拓扑绝缘体 (6、7) 和半金属 (8)。特别是，强相关的电子态为操纵传输提供了特殊的机会，包括超导性和电荷有序跃迁，并可能实现实用的量子计算（9）。莫特转变在现代电子传输研究中占有独特的地位。莫特态（10）是一个谜——简单的分析表明该系统将是金属的。在莫特绝缘体中，附近的原子似乎具有相似能量的电子态，这表明电荷容易流动。然而，由于状态是空间局域的，当添加额外的电子时，能量成本很高，并且电子转移受到抑制。这与“库仑封锁”(11)有关，是一种强电子相关性，它提供了控制电子传输的新方法。现在可以设想基于形成和破坏莫特绝缘状态的新电子设备（12），这被称为“莫特电子”。除了电子方面的考虑之外，通过离子传输改变成分也很令人感兴趣。离子流过膜使燃料电池成为可能，这种电化学装置可以将燃料转化为电能而不需要燃烧。电池还涉及耦合的还原和氧化反应，根据电化学差异产生电压和电流。最先进的可充电电池 (13, 14) 依赖于离子运动（通常为 Li），从持有高能电子的状态 [例如，充电期间阳极处的 Li++ e−+ C6（石墨）→ LiC6] 到在较低能量处稳定电子的状态（例如，在阳极处的 Li++ e−+ CoO2）
The transport of matter is central to modern condensedmatter physics. Electronic transport is vital, enabling computer communication and playing a key role in interrogating material responses. A primary classification of matter is into metals, semiconductors, and insulators, based on their electronic conductivity, and electronic considerations underpin much of the current nanomaterials revolution (1). Transport anomalies have captured the imagination of scientists, engineers, and the public, from colossal (2) and giant (3) magnetoresistance and integer (4) and fractional (5) quantum Hall effects to topological insulators (6, 7) and semimetals (8). In particular, strongly correlated electronic states offer special opportunities for manipulating transport, including superconductivity and charge-ordering transitions, and perhaps enabling practical quantum computing (9). The Mott transition holds a unique place in modern electronic transport research. The Mott state (10) is an enigma—a system that naïve analysis suggests would be metallic. In a Mott insulator, nearby atoms appear to have electronic states at similar energies, suggesting easy charge flow. However, because the states are spatially localized, when an additional electron is added the energy cost is high, and the electron transfer is inhibited. This is related to “Coulomb blockade”(11) and is a type of strong electronic correlation that confers new ways of controlling electronic transport. It is now possible to envision new electronic devices (12) based on forming and disrupting the Mott insulating state, and this has been termed “Motttronics.” Beyond electronic considerations, changes of composition via ion transport are of great interest as well. The flow of ions through membranes enables fuel cells, electrochemical devices that convert fuels to electricity without combustion. Batteries also involve coupled reduction and oxidation reactions that produce voltage and current in response to electrochemical differences. State-of-the-art rechargeable batteries (13, 14) rely on ion motion (often Li) from a state that holds high-energy electrons [eg, Li++ e−+ C6 (graphite)→ LiC6 at the anode during charging] to one that stabilizes electrons at lower energy (eg, LiCoO2→ Li++ e−+ CoO2 at the
影响因子：
44.1
作者：
Armitage, N. P.;Mele, E. J.;Vishwanath, Ashvin
通讯作者：
Vishwanath, Ashvin