Adiabatic pumping driven by moving kink and quantum standard ampere in buckled graphene nanoribbon

Dominik Suszalski, Adam Rycerz

备注：: Minor revisions; footnote (Ref.[37]) added. RevTeX, 10 pages, 10 figures
发表信息：: Phys. Rev. B 102, 165408 (2020)
DOI：: 10.1103/PhysRevB.102.165408

英文摘要：

A quantum pump in buckled graphene ribbon with armchair edges is discussed numerically. By solving the Su-Schrieffer-Heeger model and performing the computer simulation of quantum transport we find that a kink adiabatically moving along the metallic ribbon results in highly-efficient pumping, with a charge per kink transition close to the maximal value determined by the Fermi velocity in graphene. Remarkably, insulating nanoribbon show the quantized value of a charge per kink ($2e$) in relatively wide range of the system parameters, providing a candidate for the quantum standard ampere. We attribute it to the presence of a localized electronic state, moving together with a kink, whose energy lies within the ribbon energy gap.

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