Authors
Abstract
We investigate adiabatic pumping current in a graphene based normal-insulator-superconductor (NIS) junction with Corbino disk structure. The adiabatic pumping current is generated by two electrostatic potentials, oscillating periodically and out of phase, applied to the insulating and superconducting regions. Using the extended Brouwer’s formula for the adiabatic pumping current, which is based on the scattering theory, the pumping current is obtained. The results of this calculation show the pumped current oscillates as a function of the barrier strength and it has maximums at resonances with a π/2 phase shift in comparison to the planar NIS junction.
Keywords
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2. Y. Zhang et al., “Experimental observation of the quantum Hall effect and Berry's phase in graphene”; Nature 438, No. 201-204 (2005).
3. A.H. Castro Neto, F. Guinea, N.M.R. Peres, K.S. Novoselov and A.K. Geim, “The electronic properties of graphene”; Rev. Mod. Phys. 81, No 109 (2009).
4. C.W.J. Beenakker, “Specular Andreev reflection in graphene”; Phys. Rev. Lett. 97, No. 067007 (2006).
5. E. Prada, P. SanJose and H. Schomerus; “Quantum pumping in graphene”; Phys. Rev. B 80, No. 245414 (2009).
6. B. Abdollahipour and R. Mohammadkhani; “Efficient charge pumping in graphene”; J. Phys.: Condens. Matter 26, No. 085304 (2014).
7. R. Mohammadkhani, B. Abdollahipour and M. Alidoust; “Strain-controlled spin and charge pumping in graphene devices via spin-orbit coupled barriers”; EPL 111, No. 67005 (2015).
8. G.M.M. Wakker and M. Blaauboer; “Quantum pumping in a ballistic graphene bilayer”; Phys. Rev B 82, No. 205432 (2010).
9. P.W. Brouwer, “Scattering approach to parametric pumping”; Phys. Rev. B. 58, No. R10135 (1998).
10. S. Bhattacharjee and K. Sengupta, “Tunneling Conductance of Graphene NIS Junctions”; Phys. Rev. Lett. 97, No. 217001 (2006).
11. M. Alos-Palop and M. Blaauboer, “Adiabatic quantum pumping in graphene NIS junctions”; Phys. Rev. B. 84, No. 073402 (2011).
12. M. Blaauboer, “Charge pumping in mesoscopic systems coupled to a superconducting lead”; Phys. Rev. B 65, No. 235318 (2002).
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