Superfluid_presentation
- 1. Superfluid Helium-4 Transition on Multi-walled Carbon Nanotubes Presenter: Vito Iaia Principal Investigator: Dr. Gary Williams Mentor: Emin Menachekanian Department: Physics and Astronomy 4/23/15
- 2. What is Superfluid Helium-4 ? Quantum fluid (below Tλ = 2.17 K) No viscosity No entropy Macroscopic Bose-Coherence Adsorbes on top of substrates Transition temperature changes with thinner films Helium film adsorbed on surface 2
- 3. What do we Measure? 3
- 4. Main Superfluid setup Mixing Chamber Cell Shaker Cooling Capabilities Limited 4
- 5. Influence of Shaker (225Hz) 5
- 6. Experimental Approach 6 Source: W. Robertson , B. Cazzolato and A. Zander, IEEE TRANSACTIONS ON MAGNETICS, 48, No. 9, 2012.
- 7. Results (225Hz) Similar results to original setup 7
- 8. Conclusions New setup produces same response as old setup More uniform vibration across the setup Potential for less energy load on mixing chamber 8
- 9. Future Directions Investigate Thinner Films 9 4 5 6
- 10. Future Directions Potential Quantum Phase Transition 10
- 11. Thanks! Thanks to Dr. Gary Williams Graduate mentor: Emin Menachekanian Williams lab: Bob Chen, Andrew Li, Sergey Sushchikh UC LEADS Questions? 11
Editor's Notes
- #4: Measure C3 (Thickness and temperature wave) Sweep through frequencies and measure resonant response /approx C3 Similar to water waves Phase transition physics 1D film Quantum phase transitions