title: Generation of pure bulk valley current in graphene.
abstract: The generation of valley current is a fundamental goal in graphene valleytronics but no practical ways of its realization are known yet. We propose a workable scheme for the generation of bulk valley current in a graphene mechanical resonator through adiabatic cyclic deformations of the strains and a chemical potential in the suspended region. The accompanied strain gauge fields can break the spatial mirror symmetry of the problem within each of the two inequivalent valleys, leading to a finite valley current due to quantum pumping. An all-electrical measurement configuration is designed to detect the novel state with pure bulk valley currents.
authors.affiliation: Center for Statistical and Theoretical Condensed Matter Physics and Department of Physics, Zhejiang Normal University, Jinhua 321004, People's Republic of China and Beijing Computational Science Research Center, Beijing 100084, People's Republic of China.
authors.forename: Yongjin
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: IBM T.J. Watson Research Center, Yorktown Heights, New York 10598, USA.
authors.forename: Tony
authors.initials: T
authors.lastname: Low
authors.affiliation: Beijing Computational Science Research Center, Beijing 100084, People's Republic of China and SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People's Republic of China.
authors.forename: Kai
authors.initials: K
authors.lastname: Chang
authors.affiliation: Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands.
authors.forename: Mikhail I
authors.initials: MI
authors.lastname: Katsnelson
authors.affiliation: Instituto de Ciencia de Materiales de Madrid, CSIC, Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Guinea