1. Caltech collaboration for DNA-organized Nanoelectronics The Caltech DNA- nanoelectronics team

2. State of the art, DNA self- assembly 1, DNA origami

3. State of the art DNA self- assembly 2, DNA tiles, tubes and crystals

4. State of the art DNA self- assembly 3, algorithmic + combination

5. Challenges for DNA organized nanoelectronics 1A Si/ SiO 2 Pd + +

6. Challenges for DNA organized nanoelectronics 1B To make nanostructures more rigid and to avoid aggregation origami-ribbon hybrids are used. crossbar red tubeblue tubes 50 nm MOSFET geometry ChannelGate red and blue hooks

7. Challenges for DNA organized nanoelectronics 1C Over 30% of tubes are within 10 degrees of the desired orientation Characterization of DNA self-assembled CNT FET I SD V SD VgVg ab I SD Orientation of SWNT 0 5 10 15 20 25 30 35 40 0-2020-4040-6060-8080-100100-120120-140140-160160-180 22% 2% 76% Red side (-1) Unknown (0) Blue side (1) Frequency Angle

8. Challenges for DNA organized nanoelectronics 2

9. Challenges for DNA organized nanoelectronics 3,4

10. Challenges for DNA organized nanoelectronics 4,5

11. Rothemund’s Aims

12. Bridging nano and micro

13. Divergent wires

14. Winfree’s Aims

15. From counters to demultiplexers and squares

16. Self-assembled memory circuit

17. Bockrath'sAims: To self-assemble and characterize circuits of more than one carbon-nanotube based device to create elementary logic gates and memory elements. To use short length-sorted carbon nanotubes to increase the yield of existing devices. (Many problems arise from very long tubes acting as bridges between multiple origami). To self-assemble novel devices to explore transport physics in nanostructures. Bockrath’s Aims

18. Rationally Engineered Logic gates and Memory Elements Utilizing Multiple Nanotubes VsVs V in V out VsVs VsVs VsVs V in1 V out V in2 Inverter SRAM NOR Nanotube assemblySchematic circuit diagram

19. B V I Novel Devices Probing Transport Physics in Nanostructures: Phase Coherence in Strongly-Interacting Electron Systems Nanotubes act as a “which path?” interferometer enabling the study of phase coherent transport in Nanotube-based Luttinger liquids via a transport experiment. The setup is analogous to a double slit experiment in optics. The magnetic field B tunes the phase by the Ahoronov-Bohm effect. Tubes must be closer together than the phase coherence length in the electrodes, which is readily obtainable using DNA based self-assembly. Tunable separation with desired values ~5-20 nm DNA origami template for parallel nanotubes Interferometer device source drain Many possibilities exist for making novel devices. Novel Devices Probing Transport physics

20. Goddard’s Aims

21. Size of molecules quantum descriptions necessary. Quantum chemistry of molecule(s) + nanotube -> charge flow & bonding -> geometry & energy spectrum of the entire system. Organo-metallic interface mechanics and transport. Need to treat molecule as finite and nanotubes as semi-infinite electrodes. Escape currents (through organic insulator layer). Conformation effects on electronic transport. Effect of finite bias. IV characteristic of self-assembled CNT-based transistor junctions. HOMO LUMO I CNT DNA Organic molecule CNT V DNA-origami CNT-based Transistor Junctions Theory and Modeling to Describe…

22. Multiscale Methodology: 1 st -principles I-V validated by rotaxane modeling Density-functional theory (Hohenberg-Kohn-Sham) Ballistic transport theory (Landauer, Buttiker) T(E,V) contact widening self-energy Green’s ftn. Formalism (Fisher-Lee) transmission electro-chemical potential conductance current Molecular Mechanics Dynamics Molecular Mechanics Dynamics geometry dI/dV e.g. Rotaxane switch   1 m 2

23. Further validation: bi-phenyl-dithiol modeling Au (111) T(E) I(V) molecule contact

24. Relevance to ONR

25. Budget Budget for 4 years, $2.6 million including: PI: Paul Rothemund: $200K/yr for Senior Research Associate salary and materials Co-PI: Mark Bockrath $100K/yr for 1 graduate student and materials Co-PI: Bill Goddard $100K/yr for 1 graduate student and materials Co-PI: Erik Winfree $100K/yr for 1 graduate student and materials Equipment $150K/yr including plasma etcher/cleaner ($20K), wafer-scale Atomic Force Microscope ($200K) temperature-controlled dynamic light scattering ($50K).