Güttinger, Johannes

AMP Colloquium I/2011

Date: 07. April 2011
Time: 17:15 (17:00 & afterwards Apero)
Location: "Siemens Auditorium" (HIT E 51)

Electronic transport in graphene quantum dots

Johannes Güttinger Nanophysics Group (LFKP), ETH Zürich

In a quantum dot, electrons are confined in all lateral dimensions, offering the possibility for detailed investigation and controlled manipulation of individual quantum systems. The recently isolated two-dimensional carbon allotrope graphene is an interesting host to study quantum phenomena, due to its novel electronic properties and the expected weak interaction of the electron spin with the material, making it a promising system for implementing spin qubits. In the talk some early achievements with graphene dots are presented. Electron confinement in graphene quantum dots is observed by measuring Coulomb blockade and transport through excited states, a manifestation of quantum confinement. Measurements in magnetic fields enabled the observation of the electron-hole transition and the crossover to the graphene specific zero-energy Landau level at high fields. In parallel field orientation first signatures of spins are detected by measuring the Zeeman spin-splitting.