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Mechanically controllable bi-stable states in a highly conductive single pyrazine molecular junction

机译：高导电性单个吡嗪分子结中的机械可控双稳态

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摘要

We report the fabrication of a highly conductive single pyrazine molecular junction with Pt leads. Mechanically controllable break-junction measurements at low temperatures show two distinct high and low conductance states. These conductance values are two orders of magnitude larger than those of a conventional single molecular junction with anchoring groups because of direct binding of the π conjugated molecule to a metal electrode with large density of states at the Fermi energy. Inelastic electron tunneling spectroscopy combined with density functional theory calculations highlights the vibration modes of the system for the two regimes. Theory allows us to assign the high and low conductance states of the molecular junction to two configurations in which the pyrazine axis is tilted and parallel with respect to the junction axis, respectively. Finally, we show that the pyrazine junction can be reversibly switched between the two bi-stable conductance states by mechanically stretching and relaxing the junction.
机译：我们报告了与Pt引线的高导电单吡嗪分子结的制造。低温下可机械控制的断开结测量显示出两种不同的高和低电导状态。这些电导值比具有锚定基团的常规单分子结的电导值大两个数量级，这是因为π共轭分子与费米能级下具有大状态密度的金属电极直接结合。非弹性电子隧穿光谱学结合密度泛函理论计算突出了两种状态下系统的振动模式。理论允许我们将分子结的高电导率状态和低电导率状态分配给吡嗪轴分别相对于结轴倾斜和平行的两种配置。最后，我们表明吡嗪结可以通过机械拉伸和松弛该结而在两个双稳态电导状态之间可逆地切换。

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