we report on the fabrication and characterization of a dna nanopore detector with integrated tunneling electrodes . 
 functional tunneling devices were identified by tunneling spectroscopy in different solvents and then used in proof - of - principle experiments demonstrating , for the first time , concurrent tunneling detection and ionic current detection of dna molecules in a nanopore platform . 
 this is an important step toward ultrafast dna sequencing by tunneling .