Giant magnetoresistance of Dirac plasma in high-mobility graphene.
Giant magnetoresistance of Dirac plasma in high-mobility graphene.
复制标题
DOI：
10.1038/s41586-023-05807-0
复制
发表时间：
2023-04
期刊：
影响因子：
64.8
通讯作者：
Berdyugin, Alexey I.
中科院分区：
文献类型：
--
作者：
Xin, Na;Lourembam, James;Kumaravadivel, Piranavan;Kazantsev, A. E.;Wu, Zefei;Mullan, Ciaran;Barrier, Julien;Geim, Alexandra A.;Grigorieva, I. V.;Mishchenko, A.;Principi, A.;Fal'ko, V. I.;Ponomarenko, L. A.;Geim, A. K.;Berdyugin, Alexey I.
石墨烯电子光谱最容易识别的特征是它的狄拉克点，有趣的现象往往聚集在狄拉克点周围。在低温下，这一区域的本征行为通常被电荷不均匀所掩盖，但热激发可以在高温下克服这种无序，并产生狄拉克费米子的电子-空穴等离子体。狄拉克等离子体已被发现表现出不同寻常的性质，包括量子临界散射和流体动力学流动。然而，人们对等离子体在磁场中的行为知之甚少。在这里，我们报告了在这个量子临界状态下的磁输运。在低场下，等离子体表现出巨大的抛物线磁阻，当磁场为0.1Tesla时，室温下的磁阻可达100 %以上。这比在这样的温度下发现的任何其他系统的磁阻要高出数量级。我们发现，这种行为是单层石墨烯所特有的，尽管存在频繁的(普朗克极限)散射，但它的无质量光谱和超高迁移率是其基础。在电子-空穴等离子体完全位于零朗道能级的几特斯拉磁场中，随着朗道量子化的开始，出现了巨线性磁阻。它几乎与温度无关，可以通过邻近筛选来抑制，这表明它是多体起源。与奇怪金属中的磁输运以及对Weyl金属预测的所谓量子线性磁阻有明显的相似之处，这为使用这个定义良好的量子临界二维系统进一步探索相关物理提供了有趣的机会。高迁移率石墨烯中的狄拉克等离子体显示出反常的磁输运和巨磁电阻，在室温低磁场下达到100%以上。
The most recognizable feature of graphene’s electronic spectrum is its Dirac point, around which interesting phenomena tend to cluster. At low temperatures, the intrinsic behaviour in this regime is often obscured by charge inhomogeneity but thermal excitations can overcome the disorder at elevated temperatures and create an electron–hole plasma of Dirac fermions. The Dirac plasma has been found to exhibit unusual properties, including quantum-critical scattering and hydrodynamic flow. However, little is known about the plasma’s behaviour in magnetic fields. Here we report magnetotransport in this quantum-critical regime. In low fields, the plasma exhibits giant parabolic magnetoresistivity reaching more than 100 per cent in a magnetic field of 0.1 tesla at room temperature. This is orders-of-magnitude higher than magnetoresistivity found in any other system at such temperatures. We show that this behaviour is unique to monolayer graphene, being underpinned by its massless spectrum and ultrahigh mobility, despite frequent (Planckian limit) scattering. With the onset of Landau quantization in a magnetic field of a few tesla, where the electron–hole plasma resides entirely on the zeroth Landau level, giant linear magnetoresistivity emerges. It is nearly independent of temperature and can be suppressed by proximity screening, indicating a many-body origin. Clear parallels with magnetotransport in strange metals and so-called quantum linear magnetoresistance predicted for Weyl metals offer an interesting opportunity to further explore relevant physics using this well defined quantum-critical two-dimensional system. A Dirac plasma in high-mobility graphene shows anomalous magnetotransport and giant magnetoresistance that reaches more than 100 per cent in a low magnetic field at room temperature.
登录
查看更多内容
影响因子：
8.6
作者：
Alekseev, P. S.;Dmitriev, A. P.;Titov, M.
通讯作者：
Titov, M.
影响因子：
3.7
作者：
Alekseev, P. S.;Dmitriev, A. P.;Titov, M.
通讯作者：
Titov, M.
影响因子：
10.8
作者：
Friedman, Adam L.;Tedesco, Joseph L.;Gaskill, D. Kurt
通讯作者：
Gaskill, D. Kurt
影响因子：
--
作者：
Becker, JA;Curtiss, LF
通讯作者：
Curtiss, LF
影响因子：
8.6
作者：
BEERS, CJ;VANDONGEN, JCM;WYDER, P
通讯作者：
WYDER, P