The invisible quantum barrier

Weibin Li

Max Planck Institute Dresden, Germany

We contstruct the invisible quantum barrier which represents the phenomenon of quantum reflection using the available data. We use the Abel-like equation to invert the data. We find that after subtracting the Casimir-Polder interaction, the remaining effective potential is of pure quantum origin and thus vanishes when Planck's constant goes to zero. We study this invisible barrier in the case of atom and BEC refelection from a silicon wall.