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Electronic transport through single polyalanine molecules
Physical Review B ( IF 3.7 ) Pub Date : 2020-09-21 , DOI: 10.1103/physrevb.102.115425
Diana Slawig , Thi Ngoc Ha Nguyen , Shira Yochelis , Yossi Paltiel , Christoph Tegenkamp

Helical molecules have recently attracted interest due to their capability for robust spin polarization of transmitted electrons. By means of mechanically controlled break Au junctions, we analyze the transport properties of single lysine-doped and cysteine-terminated polyalanine (PA) molecules of various lengths (2.4–5.4 nm). The conductance varies exponentially with the (effective) length of the molecules and does not depend on the temperature (90–300 K), thus electron tunneling is the dominant transport mechanism. The decay constant for the PA molecule is found to be 3.5nm1, significantly smaller compared to those of other organic molecules, emphasizing the high conductivity along the helical polypeptides and reflecting a low tunneling barrier, which decreases further for fields exceeding 5×105V/cm. The conductance histograms of all PA molecules investigated reveal characteristic satellite peaks, which correlate with the apparent molecule length in multiples of characteristic peptide sequences. We attribute this effect to a racheting of interdigitated molecules adsorbed on each side of the electrodes during the opening/closing cycles.

中文翻译:

通过单个聚丙氨酸分子的电子传输

螺旋分子由于其对透射电子的鲁棒自旋极化的能力而最近引起了人们的兴趣。通过机械控制的断裂Au结,我们分析了各种长度(2.4–5.4 nm)的单赖氨酸掺杂和半胱氨酸末端的聚丙氨酸(PA)分子的传输特性。电导率随分子(有效)长度的变化呈指数变化,并且不取决于温度(90–300 K),因此电子隧穿是主要的传输机制。发现PA分子的衰减常数为3.5纳米-1个,比其他有机分子要小得多,强调了沿着螺旋多肽的高电导率并反映出低的隧穿势垒,对于超过 5×105V/厘米。研究的所有PA分子的电导直方图显示了特征性的卫星峰,该峰与特征性肽序列的倍数中的表观分子长度相关。我们将此影响归因于在打开/关闭循环期间吸附在电极两侧的叉指分子的杂乱。
更新日期:2020-09-22
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