论文标题
铁电基板上单层石墨烯中的非平凡磁场相关现象
Nontrivial magnetic field related phenomena in the single-layer graphene on ferroelectric substrate
论文作者
论文摘要
该综述的重点是我们最近对与磁场有关的铁电基板上的纳米结构单层石墨中的非平凡物理现象的预测。特别是我们预测，紧张的铁电膜中的180度域壁可以在石墨烯通道中诱导P-N连接，并导致整数量子霍尔效应的垂直模式的异常温度和栅极电压依赖性。非数量的数字及其不规则序列主要不同于常规序列ν= 3/2，5/3。不寻常的V数字来自显着不同的边缘模式ν1和ν2，对应于左侧（N1）和右（N2）P-N结边界中的载体浓度不同。 N1和N2之间的差异随着膜自发极化在副阶段的消失而消失，可以通过适当的选择不合适的菌株在薄膜 - 基底晶格不匹配的情况下通过适当的选择不合适应变来改变。接下来，我们研究了系统铁磁介电 - 石墨烯通道 - 铁电底物的电导率。磁介电局部通过诱导其中的能量间隙并使其相对于自由电子来转换石墨烯的带谱。可以证明，如果石墨烯通道中的费米水平属于能量间隔，在该间隔中，由EUO修饰的石墨烯带谱将变为自旋 - 平衡，那么这种设备可以是理想的非挥发性自旋滤波器。所考虑的系统的实际应用将受到铁磁体的库里温度的限制。控制费米水平（例如，通过变化铁电偏振的温度）可以将自旋滤波器转换为自旋阀。
The review is focused on our recent predictions of nontrivial physical phenomena taking place in the nanostructure single-layer grapheme on ferroelectric substrate, which are related with magnetic field. In particular we predicted that 180-degree domain walls in a strained ferroelectric film can induce p-n junctions in a graphene channel and lead to the unusual temperature and gate voltage dependences of the perpendicular modes ν of the integer quantum Hall effect. The non-integer numbers and their irregular sequence principally differ from the conventional sequence ν= 3/2, 5/3. The unusual v-numbers originate from significantly different numbers of the edge modes, ν1 and ν2, corresponding to different concentration of carriers in the left (n1) and right (n2) ferroelectric domains of p-n junction boundary. The difference between n1 and n2 disappears with the vanishing of the film spontaneous polarization in a paraelectric phase, which can be varied in a wide temperature range by an appropriate choice of misfit strain originated from the film-substrate lattice mismatch. Next we studied the electric conductivity of the system ferromagnetic dielectric - graphene channel - ferroelectric substrate. The magnetic dielectric locally transforms the band spectrum of graphene by inducing an energy gap in it and making it spin-asymmetric with respect to the free electrons. It was demonstrated, that if the Fermi level in the graphene channel belongs to energy intervals, where the graphene band spectrum, modified by EuO, becomes sharply spin-asymmetric, such a device can be an ideal non-volatile spin filter. The practical application of the system under consideration would be restricted by a Curie temperature of a ferromagnet. Controlling of the Fermi level (e.g. by temperature that changes ferroelectric polarization) can convert a spin filter to a spin valve.
