Bias-dependent oscillatory electron transport of monatomic sulfur chains

Type
Article

Authors
Yu, Jing-Xin
Cheng, Yan
Sanvito, Stefano
Chen, Xiang-Rong

Online Publication Date
2012-03-10

Print Publication Date
2012-03-05

Date
2012-03-10

Abstract
The bias-dependent oscillatory electron transport of monatomic sulfur chains sandwiched between gold electrodes is investigated with density functional theory and non-equilibrium Green's function method. At zero bias, in contrast to the typical odd-even oscillations observed in most metallic chains, we find that the conductance oscillates with a period of four atoms. However, as the bias voltage is increased the current displays a two-atom periodicity. This emerges gradually, first for the longer chains and then, at voltages larger than 0.7 V, for lengths. The oscillatory behaviors are analyzed by the density of states and the energy-dependent and bias-dependent transmission coefficients. © 2012 American Institute of Physics.

Citation
Yu J-X, Cheng Y, Sanvito S, Chen X-R (2012) Bias-dependent oscillatory electron transport of monatomic sulfur chains. Applied Physics Letters 100: 103110. Available: http://dx.doi.org/10.1063/1.3693380.

Acknowledgements
The authors would like to thank the support by the National Natural Science Foundation of China (Grant No. 11174214) and by the SRFDP (Grant No. 20090181110080). The SMEAGOL project (SS) is sponsored by Science Foundation of Ireland (Grant No. 07/IN.1/I945), CRANN and KAUST (ACRAB project).

Publisher
AIP Publishing

Journal
Applied Physics Letters

DOI
10.1063/1.3693380

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