▎ 摘　　要

NOVELTY - The device (100) has a layered structure (102) which comprises a conductive layer (110), insulating layer (112) and graphene layer (114). The insulating layer couples the conductive layer to graphene layer. The electrodes (104,106) are electrically coupled to graphene layer. A dopant island (108) is coupled to an exposed surface (116) of graphene layer between electrodes. The dopant island is selected from group which consists of superconducting material, ferromagnetic material, antiferromagnetic material, photovoltaic material, organic material, biological material and spintronic material. USE - Graphene device. ADVANTAGE - The finite coherence length limits the length of the junction to one micron and reduces the system to essentially one dimension. A coupling strength of microscopic interaction variably depends on one essential factor. Avoids complicated lithographic patterning and exploits the poor wettability of graphite to produce an array of submicron islands. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method of using a graphene device. DESCRIPTION OF DRAWING(S) - The drawing shows the top view of the graphene device. Graphene device (100) Layered structure (102) Electrodes (104,106) Dopant island (108) Conductive layer (110) Insulating layer (112) Graphene layer (114) Surface (116)