  In the present work, we examine a prototypical model for the formation of
bright breathers in nonlinear left-handed metamaterial lattices. Utilizing the
paradigm of nonlinear transmission lines, we build a relevant lattice and
develop a quasi-continuum multiscale approximation that enables us to
appreciate both the underlying linear dispersion relation and the potential for
bifurcation of nonlinear states. We focus here, more specifically, on bright
discrete breathers which bifurcate from the lower edge of the linear dispersion
relation at wavenumber $k=\pi$. Guided by the multiscale analysis, we calculate
numerically both the stable inter-site centered and the unstable site-centered
members of the relevant family. We quantify the associated stability via
Floquet analysis and the Peierls-Nabarro barrier of the energy difference
between these branches. Finally, we explore the dynamical implications of these
findings towards the potential mobility or lack thereof (pinning) of such
breather solutions.
