论文标题
半法中载体密度通过短程相关性的变化：镍ndnio $ _2 $的案例研究
Variation of carrier density in semimetals via short-range correlation: A case study with nickelate NdNiO$_2$
论文作者
论文摘要
载体密度是材料特性的关键控制因素之一，尤其是在控制强相关材料的基本相关性方面。通常，载体密度是通过掺杂或门控来外部调节的，并保持在室温以下。奇怪的是，通常发现相关半法中的载体密度因温度，磁场和压力等弱外部控制而有敏感性变化。在这里，我们开发了一种逼真的模拟方案，该方案结合了没有长期阶数的原子间非合线磁相关。以最近发现的镍超导体为例，我们证明了一种相当通用的低能机制，即在半学中，短距离相关也可以反向调节载体密度。相关和载体密度之间的这种相互影响为敏感的分叉行为提供了额外的成分。相关半法的这种特殊特征解释了它们在低能时的多功能载体密度，并为这些材料的功能开辟了新的可能性。
Carrier density is one of the key controlling factors of material properties, particularly in controlling the essential correlations in strongly correlated materials. Typically, carrier density is externally tuned by doping or gating and remains fixed below room temperature. Strangely, the carrier density in correlated semimetals is often found to vary sensitively against weak external controls such as temperature, magnetic field, and pressure. Here, we develop a realistic simulation scheme that incorporates interatomic noncollinear magnetic correlation without a long-range order. Using the recently discovered nickelate superconductor as an example, we demonstrate a rather generic low-energy mechanism that in semimetals short-range correlation can reversely modulate the carrier density as well. Such a mutual influence between correlation and carrier density provides an extra ingredient for sensitive bifurcating behavior. This special feature of correlated semimetals explains their versatile carrier density at low energy and opens up new possibilities of functionalizing these materials.
