Skyrmion solids in monolayer graphene.
Skyrmion solids in monolayer graphene.
复制标题
单层石墨烯中的斯格明子固体。
DOI：
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
A. Young
中科院分区：
文献类型：
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作者：
Haoxin Zhou;H. Polshyn;T. Taniguchi;Kenji Watanabe;A. Young
部分填充的朗道能级拥有竞争的秩序，随着朗道能级的填充，电子固体在让位给分数量子霍尔液体之前，接近整数填充。在这里，我们报告的电子固体与非共线自旋纹理在单层石墨烯的观察，一致的skyrmions---拓扑自旋纹理的特点是量子化电荷的固化。在电输运中，随着温度的降低，电子固体通过体电导率中的快速金属-绝缘体转变来揭示自己，伴随着对所施加的偏置电压的强烈非线性依赖的出现。我们使用修改后的Corbino几何形状，允许铁磁磁振子发射和检测的固体探测自旋纹理。我们发现当一个朗道能级被填充时，磁振子输运是非常有效的（$
u=1$），与量子霍尔铁磁自旋极化一致;然而，即使是最小的掺杂也会立即淬灭磁振子信号，同时保持消失的低温电荷电导率不变。我们的结果可以理解的形成固体的带电skyrmions附近$
u=1$，它的非共线自旋织构导致快速的磁振子衰变。分数填充附近的数据进一步显示了几个分数skyrmion晶体的证据，表明石墨烯拥有一个巨大的和高度可调的耦合自旋和电荷顺序的景观。
Partially filled Landau levels host competing orders, with electron solids prevailing close to integer fillings before giving way to fractional quantum Hall liquids as the Landau level fills. Here, we report the observation of an electron solid with noncolinear spin texture in monolayer graphene, consistent with solidification of skyrmions---topological spin textures characterized by quantized electrical charge. In electrical transport, electron solids reveal themselves through a rapid metal-insulator transition in the bulk electrical conductivity as the temperature is lowered, accompanied by the emergence of strongly nonlinear dependence on the applied bias voltage. We probe the spin texture of the solids using a modified Corbino geometry that allows ferromagnetic magnons to be launched and detected. We find that magnon transport is highly efficient when one Landau level is filled ($
u=1$), consistent with quantum Hall ferromagnetic spin polarization; however, even minimal doping immediately quenches the the magnon signal while leaving the vanishing low-temperature charge conductivity unchanged. Our results can be understood by the formation of a solid of charged skyrmions near $
u=1$, whose noncolinear spin texture leads to rapid magnon decay. Data near fractional fillings further shows evidence for several fractional skyrmion crystals, suggesting that graphene hosts a vast and highly tunable landscape of coupled spin and charge orders.
影响因子：
19.6
作者：
Zibrov, A. A.;Spanton, E. M.;Young, A. F.
通讯作者：
Young, A. F.
影响因子：
64.8
作者：
Smet, JH;Deutschmann, RA;von Klitzing, K
通讯作者：
von Klitzing, K