A sheet feeding apparatus includes a first tray, a second tray disposed above the first tray, a feeding portion configured to feed a sheet in a feed direction, and a first wall portion disposed at one end of the second tray in a width direction and fixed relative to the first tray. The QWFinFET includes a semiconductor fin over a substrate and a combo quantum well structure over the semiconductor fin. The first tool half has surface features for molding and retaining the array.