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Using the transfer matrix in the angular-momentum space we investigate theimpact of trigonal warping on magnetotransport and scaling properties of aballistic bilayer graphene in the Corbino geometry. Although the conductivityat the charge-neutrality point and zero magnetic field exhibits a one-parameterscaling, the shot-noise characteristics, quantified by the Fano factor$\mathcal{F}$ and the third charge-transfer cumulant $\mathcal{R}$, remainpseudodiffusive. This shows that the pseudodiffusive transport regime inbilayer graphene is not related to the universal value of the conductivity butcan be identified by higher charge-transfer cumulants. For Corbino disks withlarger radii ratios the conductivity is suppressed by the trigonal warping,mainly because the symmetry reduction amplifies backscattering for normal modescorresponding to angular-momentum eigenvalues $\pm{}2\hbar$. Weak magneticfields enhance the conductivity, reaching the maximal value near the crossoverfield $B_L=\frac{4}{3}\sqrt{3}\,({\hbar}/{e})\,t't_\perp\!\left[{t_0^2a(R_{\rmo}-R_{\rm i})}\right]^{-1}$, where $t_0$ ($t_\perp$) is the nearest-neighborintra- (inter-)layer hopping integral, $t'$ is the skew-interlayer hoppingintegral, and $R_{\rm o}$ ($R_{\rm i}$) is the outer (inner) disk radius. Formagnetic fields $B\gtrsim{}B_L$ we observe quasiperiodic conductanceoscillations characterized by the decreasing mean value$\langle\sigma\rangle-\sigma_0\propto{}B_L/B$, where $\sigma_0=(8/\pi)\,e^2/h$.The conductivity, as well as higher charge-transfer cumulants, show beatingpatterns with an envelope period proportional to $\sqrt{B/B_L}$. Thisconstitutes a qualitative difference between the high-field ($B\gg{}B_L$)magnetotransport in the $t'=0$ case (earlier discussed in Ref. [1]) and in the$t'\neq{}0$ case, providing a finite-system analog of the Lifshitz transition.

physical review. b./physical review. b

Trigonal warping, pseudodiffusive transport, and finite-system version  of the Lifshitz transition in magnetoconductance of bilayer-graphene Corbino  disks