Browsing by Author "Lu, Jianming"

Now showing 1 - 2 of 2

Large-scale Mesoscopic Transport in Nanostructured Graphene
(2013-02-06)
Zhang, Haijing
;
Lu, Jianming
;
Shi, Wu
;
Wang, Zhe
;
Zhang, Ting
Through exponential sample-size scaling of conductance, we demonstrate strong electron localization in three sets of nanostructured antidot graphene samples with localization lengths of 1.1, 2, and 3.4 mu m. The large-scale mesoscopic transport is manifest as a parallel conduction channel to 2D variable range hopping, with a Coulomb quasigap around the Fermi level. The opening of the correlation quasigap, observable below 25 K through the temperature dependence of conductance, makes possible the exponential suppression of inelastic electron-electron scatterings and thereby leads to an observed dephasing length of 10 mu m. DOI: 10.1103/PhysRevLett.110.066805
Negative correlation between charge carrier density and mobility fluctuations in graphene
(2014-08-26)
Lu, Jianming
;
Pan, Jie
;
Yeh, Sheng-Shiuan
;
Zhang, Haijing
;
Zheng, Yuan
By carrying out simultaneous longitudinal and Hall measurements in graphene, we find that the 1/f noise for the charge carrier density is negatively correlated to that of mobility, with a governing behavior that differs significantly from the relation between their mean values. The correlation in the noise data can be quantitatively explained by a single-parameter theory whose underlying physics is the trapping and detrapping of the fluctuating charge carriers by the oppositely charged Coulomb scattering centers. This can alter the effective density of long-range scattering centers in a transient manner, with the consequent fluctuating effect on the mobility.