Quantum pumping with adiabatically modulated barriers in graphene

Rui Zhu; Huimin Chen
September 2009
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p122111
Academic Journal
We study the adiabatic quantum pumping characteristics in graphene modulated by two oscillating gate potentials out of phase. The angular and energy dependence of the pumped current (PC) is presented. The direction of the PC can be reversed when a high potential barrier demonstrates stronger transparency than a low one, which results from the Klein paradox. The underlying physics of the pumping process is illuminated.


Related Articles

  • Giant Goos-Hänchen shift in graphene double-barrier structures. Song, Yu; Wu, Han-Chun; Guo, Yong // Applied Physics Letters;6/18/2012, Vol. 100 Issue 25, p253116 

    We report giant Goos-Hänchen shifts [Goos and Hänchen, Ann. Phys. 436, 333 (1947)] for electron beams tunneling through graphene double barrier structures. We find that inside the transmission gap for the single barrier, the shift displays sharp peaks with magnitudes up to the order of...

  • Physicochemical properties of hybrid graphene-lead sulfide quantum dots prepared by supercritical ethanol. Tavakoli, Mohammad; Tayyebi, Ahmad; Simchi, Abdolreza; Aashuri, Hossein; Outokesh, Mohmmad; Fan, Zhiyong // Journal of Nanoparticle Research;Jan2015, Vol. 17 Issue 1, p1 

    Recently, hybrid graphene-quantum dot systems have attracted increasing attention for the next-generation optoelectronic devices such as ultrafast photo-detectors and solar energy harvesting. In this paper, a novel, one-step, reproducible, and solution-processed method is introduced to prepare...

  • Estimates of the elastic characteristics of graphenes. Davydov, S. Yu. // Physics of the Solid State;Oct2009, Vol. 51 Issue 10, p2166 

    The central and noncentral force constants have been calculated within the previously proposed model of the binding energy of carbon atoms in graphene, which is based on the Harrison bonding orbital method. The results obtained have been used to estimate the characteristic phonon frequencies and...

  • Angular confinement and direction-dependent transmission in graphene nanostructures with magnetic barriers. Masir, M. Ramezani; Vasilopoulos, P.; Matulis, A.; Peeters, F. M. // AIP Conference Proceedings;1/4/2010, Vol. 1199 Issue 1, p363 

    We evaluate the transmission through magnetic barriers in graphene-based nanostructures. Several particular cases are considered: a magnetic step, single and double barriers, δ -function barriers as well as barrier structures with inhomogeneous magnetic field profiles but with average...

  • Graphene as transparent electrode for direct observation of hole photoemission from silicon to oxide. Yan, Rusen; Zhang, Qin; Kirillov, Oleg A.; Li, Wei; Basham, James; Boosalis, Alex; Liang, Xuelei; Jena, Debdeep; Richter, Curt A.; Seabaugh, Alan C.; Gundlach, David J.; Xing, Huili G.; Nguyen, N. V. // Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p123106 

    We demonstrate the application of graphene as collector material in internal photoemission (IPE) spectroscopy, which enables direct observation of both electron and hole injections at a Si/Al2O3 interface and overcomes the long-standing difficulty of detecting holes in IPE measurements. The...

  • Olympicene: smallest possible five rings.  // TCE: The Chemical Engineer;Jul2012, Issue 853, p20 

    A photograph which shows the smallest possible five-ringed structure called olympicene is presented.

  • Room temperature nonlinear operation of a graphene-based three-branch nanojunction device with chemical doping. Fadzli Abd Rahman, Shaharin; Kasai, Seiya; Manaf Hashim, Abdul // Applied Physics Letters;5/7/2012, Vol. 100 Issue 19, p193116 

    A chemically doped graphene-based three-branch nanojunction device is fabricated on a SiO2/p-Si substrate, and its nonlinear operation is characterized at room temperature (RT). By polyethyleneimine doping, the fabricated device shows improved field effect mobility of 14 800 and 16 100 cm2/Vs...

  • Electronic states in ordered and disordered quantum networks: with applications to graphene and to boron nanotubes. March, N. H.; Angilella, G. G. N. // Journal of Mathematical Chemistry;Aug2009, Vol. 46 Issue 2, p532 

    The idea behind the original quantum network (QN) model is simple enough. One joins each atom to its nearest neighbours, and then treats electrons (though quantum mechanically of course) as though they flowed through one-dimensional wires as in an electrical circuit obeying Kirchhoff�s Laws...

  • Simultaneous determination of uric acid and dopamine using a carbon fiber electrode modified by layer-by-layer assembly of graphene and gold nanoparticles. Jiao Du; Ruirui Yue; Fangfang Ren; Zhangquan Yao; Fengxing Jiang; Ping Yang; Yukou Du // Gold Bulletin;Sep2013, Vol. 46 Issue 3, p137 

    A novel layer-by-layer assembly of graphene sheets and gold nanoparticles modified carbon fiber electrode (GE/Au/GE/CFE) was successfully fabricated and applied to simultaneous determination of dopamine (DA) and uric acid (UA). The structure of GE/Au/GE/CFE was characterized by scanning electron...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics