Bias-dependent oscillatory electron transport of monatomic sulfur chains
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AbstractThe 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.
CitationYu 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.
SponsorsThe 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).
JournalApplied Physics Letters