SEM Image (image) University of Illinois College of Engineering Caption Top: This is an SEM image of a typical device. Mechanically exfoliated Bi2Se3 thin film is colored as brown and contact metals consist of Ti(2.5nm)/Al(140nm). Top right: Hall data where red curve is longitudinal resistivity and blue curve is Hall carrier density as a function of gate voltage. Bottom figure: This is a 2-D plot of differential resistance as a function of gate voltage(x axis) and current(y axis). Purple region in the center corresponds to zero differential resistance (superconducting regime) Credit Sungjae Cho, Department of Physics & Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.