JARA-FIT Annual Report 2012 JARA-FIT Jülich Aachen Research Alliance for Fundamentals of Future Information Technology Annual Report 2012 Forschungszentrum Jülich RWTH Aachen JARA-FIT Annual Report 2012 JARA-FIT Annual Report 2012 Dear Reader, It was in 1965 when Gordon Moore, co-founder of Intel, realized that the number of components in integrated circuits (ICs) had doubled every year since the invention of the IC in 1958. Moore was optimistic that this increase would continue for at least ten more years. It is amazing to see that ‘Moore’s law’ still describes the trend in the semiconductor industry after 55 years. This increase in performance has important consequences for all of us. Information technology is pervading all areas of our life. It has assumed a key function in areas as varied as communication, industrial production, transport, energy and environmental technology, health, and last but not least entertainment. When we now enjoy inexpensive electronic toys they use more computation power than was available for the first landing of Apollo 11 on the moon in 1969. Since the industrial revolution no other technology has accomplished such a pronounced growth. Yet we all know that exponential growth cannot continue forever. In the next decade, the development of IT systems will be dominated by two major trends ‐ a continuation of the exponential increase in performance and efficiency (“Moore´s law”) by further down‐scaling, new materials, and novel device concepts ‐ and additional functionalities (“More than Moore”) by the emergence of advanced concepts in, e.g., sensors and wireless transmission. Beyond this, new concepts of quantum information processes seem close ahead and are likely to bring new innovations in the field of future information technology. JARA-FIT is one of the drivers of this development and looks back to an exciting year. In June 2012 RWTH Aachen and JARA were successful within the excellence initiative. RWTH Aachen’s plan to promote top level research by becoming an Integrated Interdisciplinary University of Technology was selected once again by the German Science Council and will be funded until 2017. RWTH plans to further sharpen its internationally visible scientific profile in close collaboration with the Jülich research center. Within JARA-FIT we are committed to further strengthen the close cooperation between Jülich and Aachen by creating joint institutes for Quantum Computing and GreenIT, which will bring the strategic planning in research, teaching and infrastructure to new levels. JARA-FIT and its researchers were successful in other areas as well. Several colleagues from Jülich and Aachen including Christoph Stampfer and Markus Morgenstern are part of the European Flagship Graphene, which plans to utilize the remarkable properties of this exciting material in novel applications. Rafal Dunin-Borkowski won an ERC Advanced Grant to develop techniques based on electron microscopy to image magnetic field with almost atomic resolution. Paul Körgeler was awarded an ERC Starting Grant to tailor Magnetic Molecules for Spintronic Devices. Furthermore a virtual institute for Topological Insulators was founded within JARA- FIT. These novel materials attract the interest of several scientists, who are also active within a priority program of the German Science Foundation. We were also pleased to be able to share the exciting science with our international colleagues at the Nature Conference on the Frontiers in Electronic Materials, which was held in the Eurogress in Aachen and organized by JARA-FIT and the Nature Publishing Group. By now nanoelectronics is not only describing the research activities of more than 40 colleagues in JARA-FIT. Nanoelectronics is also becoming more visible in our teaching activities. New courses are developed and a master with specialization in nanoelectronics is now awarded by RWTH Aachen. To further strengthen the field, an IFF-Spring School for Quantum Information Processing was organized by David DiVincenzo. While we are reluctant to apply Moore’s Law to the development of JARA-FIT and predict its future, we are happy to look back at 5 years of continued growth and interaction within JARA-FIT. Matthias Wuttig Detlev Grützmacher Scientific Director JARA-FIT Scientific Director JARA-FIT 1 JARA-FIT Annual Report 2012 Contents JARA-FIT in Headlines ............................................................................................................... 4 General Information ................................................................................................................. 13 JARA-FIT Members .................................................................................................................... 15 JARA-FIT Institutes .................................................................................................................... 17 Selected Research Reports ..................................................................................................... 27 Strained Si nanowire complementary tunnel field-effect transistors for low power inverter circuits .................................................................................................................. 29 Lattice Dynamics of Nanocrystalline Silicon for Thermoelectric Application: Effects of Impurities ........................................................................................................... 31 Electronically non-alloyed state of a statistical single atomic layer semiconductor alloy ........................................................................................................... 33 Integrated Silicon Photonics for Optical Communications and Biosensing ...................... 35 Synthesis of GeSn Semiconductors for Optoelectronic Applications ............................... 37 Growth and vertical integration of (Ga,In)N nanostructures for future single photon emitters .................................................................................................................. 39 Bulk electronic structure of the dilute magnetic semiconductor Ga1-xMnxAs through hard X-ray angle-resolved photoemission ........................................................... 41 Controllable Supercurrent and Inter-ference Effect in Nb/InAs-nanowire/Nb Hybrid Devices .................................................................................................................. 43 Scanning tunneling microscopy with InAs nanowire tips .................................................. 45 Monitoring structural influences on quantum transport in InAs nanowires ....................... 47 High-Fidelity Single-Qubit Gates for Two-Electron Spin Qubits in GaAs .......................... 49 Electric field-driven coherent spin reorientation of spin packets in InGaAs ...................... 51 Noise Analysis of Qubits Implemented in Triple Quantum Dot Systems in a Davies Master Equation Approach .................................................................................... 53 Efficiency and Power of a Quantum Dot Energy Conversion Device ............................... 55 Readout of carbon nanotube vibrations by intrinsic spin-phonon resonance ................... 57 Multi-wavelength polar-dielectric superlens and graphene superlens .............................. 59 Strong correlations on topological insulator surfaces and the breakdown of the bulk- boundary correspondence ........................................................................................ 61 Higgs transition in quantum spin ice Yb2Ti2O7 .................................................................. 63 Antiferromagnetism in the Hubbard Model on the Bernal-stacked Bilayer ....................... 65 Spin relaxation in metals and thin metallic films................................................................ 67 Ultrafast magnetization enhancement in metallic multilayers driven by super- diffusive spin currents ........................................................................................................ 69 Quenched Slonczewski-windmill in spin-torque vortex oscillators .................................... 71 Topological solitons driven by Landau-Lifshitz-Slonzcewski equations ............................ 73 Theoretical probing of inelastic spin-excitations in adatoms on surfaces ......................... 75 Electrical Transport through Single Nanoparticles and Nanoparticle Arrays .................... 77 Dissecting a Multifunctional Organic-Metal Bond by Molecular Manipulation .................. 79 Orbital tomography for highly symmetric adsorbate systems ........................................... 81 2 JARA-FIT Annual Report 2012 Surface ‘click’ of DNA followed by directed metallization allows construction of contactable conducting nanostructures ............................................................................ 83 Single-crystal neutron-diffraction study of the biomolecule guanidine 151 years after its first synthesis ........................................................................................................ 85 Patterned Gold Nanoparticles with Tunable Surface Properties ...................................... 87 A Very Large Micro Electrode Array for Recording and Stimulation of Retinal Ganglion Cells ................................................................................................................... 89 All Diamond Microelectrode Arrays Produced by a Non-Lapidary Method to Detect Cell Action Potentials ............................................................................................