  We report that mechanical deformation of graphite with cavity shock waves
introduces a new group of charge carriers, with both effective mass and native
concentration one order of magnitude above those found in the pristine
material. Their nature, however, remains quasi-2D. Our results show that
defects introduced during mechanical exfoliation have the potential to unlock
oscillatory behavior above 50 T in graphite, thus providing a new probe for
field-induced electronic phase transitions in the material.
