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Negative nonlocal vicinity resistance of viscous flow in a two-dimensional electron system
Physical Review B  (IF4.036),  Pub Date : 2021-10-26, DOI: 10.1103/physrevb.104.155308
Wei-Jie Ji, Shu-Yu Zheng, Li Lu, Kai Chang, Chi Zhang

We perform a quantum transport study of Hall viscous liquid in multiterminal narrow Hallbar devices of a high-mobility two-dimensional electron system (2DES) in GaAs/AlGaAs heterostructure. In the nonlocal transport measurements of vicinity geometry under magnetic fields $\left(B\right)$, we observe that the absolute negative magnetoresistance $\left({R}_{xx}\right)$ value $\left({R}_{\text{min}}<0\right)$ and the corresponding magnetic field $\left({B}_{\text{min}}\right)$ are both inversely proportional to the adjacent Hallbar arm distance $\left(L\right)$. The occurrence of negative resistance is dependent on the characteristic lengths of the devices and the electron flow direction under $B$-fields. The minimal resistance ${R}_{\text{min}}$ occurs when the cyclotron radius ${R}_{C}$ approximates $L$. Multiples of high-order ($n\mathrm{th}$-order) ${R}_{\text{min},n}$'s persist from low to high magnetic fields in a large sample size of $L=5\phantom{\rule{4pt}{0ex}}\mu \mathrm{m}$. Our experimental study reveals the transport behaviors in the vicinity regime, where the negative resistances depict viscous electronic flows in the high-mobility 2DES. In addition, the negative and high-order minimal resistances expand to a magnetic field of several kGs.