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Quantum Pumping with Adiabatically Modulated Barriers in Three-Band Pseudospin-1 Dirac-Weyl Systems
1Department of Physics, South China University of Technology, Guangzhou 510641, China.
Abstract:
In this work, pumped currents of the adiabatically-driven double-barrier structure based on the pseudospin-1 Dirac-Weyl fermions are studied. As a result of the three-band dispersion and hence the unique properties of pseudospin-1 Dirac-Weyl quasiparticles, sharp current-direction reversal is found at certain parameter settings especially at the Dirac point of the band structure, where apexes of the two cones touch at the flat band. Such a behavior can be interpreted consistently by the Berry phase of the scattering matrix and the classical turnstile mechanism.
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