  Transverse electric (TE) modes can not propagate through the conducting
solids. This is because the continuum of particle-hole excitations of
conductors contaminates with the TE mode and dampes it out. But in solids
hosting tilted Dirac cone (TDC) that admit a description in terms of a modified
Minkowski spacetime, the new spacetime structure remedies this issue and
therefore a tilted Dirac cone material (TDM) supports the propagation of an
undamped TE mode which is sustained by density fluctuations. The resulting TE
mode propagates at fermionic velocities which strongly confines the mode to the
surface of the two-dimensional (2D) TDM.
