  For the periodic sphaleron potential in the electroweak theory, we find the
one-dimensional time-independent Schr\"{o}dinger equation with the Chern-Simons
number as the coordinate, construct the Bloch wave function and determine the
corresponding conducting (pass) band structure. We show that the baryon-lepton
number violating processes can take place without the exponential tunneling
suppression (at zero temperature) at energies around and above the barrier
height (sphaleron energy) at 9.0 TeV. Phenomenologically, probable detection of
such processes at LHC is discussed.
