Current-voltage curves of gold quantum point contacts revisited
Current-voltage curves of gold quantum point contacts revisited
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DOI：
10.1063/1.127093
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发表时间：
2000-07-31
影响因子：
4
通讯作者：
Besenbacher, F
中科院分区：
文献类型：
--
作者：
Hansen, K;Nielsen, SK;Besenbacher, F
我们测量了电导高达4G(0)(G(0)=2E(2)/h)和电压高达2V的金量子点接触(QPC)的电流-电压(I-V)曲线。QPC是在室温清洁的超高真空条件下，在扫描隧道显微镜的金尖和Au(110)表面之间形成的。与前人报道的结果相比，I-V曲线几乎呈线性。单原子和双原子接触的I-V曲线的紧束缚计算与我们的测量结果符合得很好。另一方面，只有当样品在空气中净化后，才能观察到明显的非线性I-V曲线。(C)2000年美国物理研究所。[S0003-6951(00)02530-4]。
We present measurements of current-voltage (I-V) curves on gold quantum point contacts (QPCs) with a conductance up to 4 G(0) (G(0) = 2e(2)/h is the conductance quantum) and voltages up to 2 V. The QPCs are formed between the gold tip of a scanning tunneling microscope and a Au(110) surface under clean ultra-high-vacuum conditions at room temperature. The I - V curves are found to he almost linear in contrast to previous reports. Tight-binding calculations of I - V curves for one- and two-atom contacts are in excellent agreement with our measurements. On the other hand, clearly nonlinear I - V curves are only observed when the sample has been cleaned in air. (C) 2000 American Institute of Physics. [S0003-6951(00)02530-4].