Two-dimensional magnetic monopole gas in an oxide heterostructure
Two-dimensional magnetic monopole gas in an oxide heterostructure
复制标题
二维磁单极气体中的氧化物异质结构
DOI：
10.1038/s41467-020-15213-z
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发表时间：
2020-03-12
影响因子：
16.6
通讯作者：
Shen, K. M.
中科院分区：
文献类型：
--
作者：
Miao, L.;Lee, Y.;Shen, K. M.
磁单极子被认为是焦绿盐自旋冰化合物中的涌现准粒子。然而，与半导体和二维电子气体不同的是，在半导体和二维电子气体中，电荷自由度可以通过化学掺杂、界面调制和静电门控来主动控制，而在涌现磁单极子中，还没有类似的这些效应。迄今为止，所有的实验研究都局限于由块状晶体中数量相等的单极子和反单极子组成的大系综。为了解决这些问题，我们提出了一种具有净磁荷的二维磁单极子气体（2DMG）的形成，该气体被限制在自旋冰和等结构反铁磁火绿石铱酸盐之间的界面上，其单极子密度可以由外场控制。我们的建议是基于热力学和输运性质的蒙特卡罗模拟。这种提出的2DMG应该能够在磁单极子上进行实验和设备，类似于半导体异质结构中的二维电子气体。
Magnetic monopoles have been proposed as emergent quasiparticles in pyrochlore spin ice compounds. However, unlike semiconductors and two-dimensional electron gases where the charge degree of freedom can be actively controlled by chemical doping, interface modulation, and electrostatic gating, there is as of yet no analogue of these effects for emergent magnetic monopoles. To date, all experimental investigations have been limited to large ensembles comprised of equal numbers of monopoles and antimonopoles in bulk crystals. To address these issues, we propose the formation of a two-dimensional magnetic monopole gas (2DMG) with a net magnetic charge, confined at the interface between a spin ice and an isostructural antiferromagnetic pyrochlore iridate and whose monopole density can be controlled by an external field. Our proposal is based on Monte Carlo simulations of the thermodynamic and transport properties. This proposed 2DMG should enable experiments and devices which can be performed on magnetic monopoles, akin to two-dimensional electron gases in semiconductor heterostructures.