He reckoned the moiré cell itself would have one property that varied strictly with rotation angle, more or less independently of the details of the atoms that made it up. That property was a critical one: the amount of energy a free electron in the cell would have to gain or shed to tunnel between the two graphene sheets. That energy difference was usually enough to serve as a barrier to intersheet tunneling. But MacDonald calculated that as the rotation angle narrowed from a larger one, the tunneling energy would shrink, finally disappearing altogether at exactly 1.1 degrees.
With a Simple Twist, a ‘Magic’ Material Is Now the Big Thing in Physics
December 24, 1968
A clock recovered from Hiroshima that was destroyed during the atomic bombing frozen at the exact moment when the bomb exploded.
Contingency or randomness, gaps and blind spots are immanent features of formal systems, as they attempt to invent axioms and rules.
Elliptical mirrors of the large Cherenkov counter at CERN
Cassini's final image
Solar eclipse as seen from the moon