Direct measurement of conduction miniband structure in superlattice by visible-light photoemission spectroscopy

Measurement of energy distribution of conduction electrons in superlattice by visible-light photoemission spectroscopy

“…In the VPS, we utilize a surface with a negative electron affmity (NEA) state to emit the conduction electrons into a vacuum from a semiconductor. Actually, we have succeeded in observing the conduction mini-band structure in a superlattice by VPS in the previous study [4]. However, we have not clarified the energy distributions in the conduction mini-bands when various excitation lights are irradiated to the superlattice.…”

“…The energy from Fermi level in the supperlattice specimen E -EF, is determined from the following equation[4]:…”