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Quantum coherence and its dephasing in the giant spin Hall effect and nonlocal voltage generated by magnetotransport through multiterminal graphene bars

机译:量子相干及其在巨旋转霍尔效应和相位中的失相   磁转运通过多端石墨烯产生的非局部电压   酒吧

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摘要

Motivated by the recent experimental observation [D. A. Abanin et al.,Science 323, 328 (2011)] of nonlocality in magnetotransport near the Diracpoint in six-terminal graphene Hall bars, for a wide range of temperatures andmagnetic fields, we develop a nonequilibrium Green function (NEGF) theory ofthis phenomenon. In the phase-coherent regime and strong magnetic field, wefind large spin Hall (SH) conductance in four-terminal bridges, where the SHcurrent is pure only at the Dirac point (DP), as well as the nonlocal voltageat a remote location in six-terminal bars where the direct and inverse SHeffect operate at the same time. The "momentum-relaxing" dephasing reducestheir values at the DP by two orders of magnitude while concurrently washingout any features away from the DP. Our theory is based on the Meir-Wingreenformula with dephasing introduced via phenomenological many-body self-energies,which is then linearized for multiterminal geometries to extract currents andvoltages.
机译:由最近的实验观察[D。 A. Abanin et al。,Science 323,328(2011)]在六端石墨烯霍尔棒中Diracpoint附近的磁传输中的非局部性,对于宽范围的温度和磁场,我们开发了这种非平衡格林函数(NEGF)理论现象。在相干态和强磁场下,我们在四端桥中确定了大自旋霍尔(SH)电导,其中SHcurrent仅在狄拉克点(DP)处是纯的,在六个位置的偏远位置处的非局部电压都是纯的-端子棒,其中正向和反向SHeffect会同时运行。 “放松动量”的移相将其在DP处的值减小了两个数量级,同时从DP上清除了所有特征。我们的理论基于通过现象学多体自能量引入的具有相移的Meir-Wingreen公式,然后将其线性化以实现多端子几何形状,以提取电流和电压。

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