Trapped ions meet solid state physics - University of California
Transcript of Trapped ions meet solid state physics - University of California
![Page 1: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/1.jpg)
Hartmut Häffner
Department of Physics, University of California, Berkeley
Boulder, Feb 16th 2011
Trapped ions meet solid state physics
• Introduction
• Quantum emulation
• Shuttling charged particles in 3D
• Comments on anomalous heating
• Conclusions
![Page 2: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/2.jpg)
Trapped ions and condensted matter
/ww
w. p
hys
.sci
.os a
ka- u
.ac.
j p
Trapped ions Condensed matter
Emulation
Better traps
![Page 3: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/3.jpg)
• Introduction
• Quantum emulation
• Shuttling charged particles in 3D
• Comments on anomalous heating
• Conclusions
![Page 4: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/4.jpg)
Quantum emulation
General idea: use the motion of ions in individual micro-traps to emulate
interesting quantum physics
Questions:
- how does energy flow?
- thermal equilibrium?
- can we trap an excitation by minimal reconfiguration?
Light harvesting complexes
![Page 5: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/5.jpg)
Study emergent phenomena
Dry friction:
Crystal I
Crystal II
![Page 6: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/6.jpg)
Quantum emulation of dry friction
A linear trap in an optical cavity: an ion string in a periodic potential
Crystal I
Crystal II
Frenkel-Kontorova model
Features:- quantum phase transition - non-analytic breaking of KAM surfaces
Optical trapping of ions: T. Schätz, Munich
![Page 7: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/7.jpg)
Experimental set-up
Cavity mirrors
Trap
![Page 8: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/8.jpg)
Heat flow in ion strings
Global cooling beam Focussed heating beam
Red detunedcooling and detection
Blue detunedheating
Melting of crystal
Temperaturedistribution?
![Page 9: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/9.jpg)
Near term plans: basic thermodynamics with ion strings / crystals
– Heat flow
– Temperature distribution
– Heat capacitance
– Latent heat of crystal melting
Near term plans
Thaned (Hong) PruttivarasinMichael RammAxel Kreuter
![Page 10: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/10.jpg)
• Introduction
• Quantum emulation
• Shuttling charged particles in 3D
• Comments on anomalous heating
• Conclusions
![Page 11: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/11.jpg)
A lattice trap
![Page 12: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/12.jpg)
RF-transport
![Page 13: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/13.jpg)
Karin et al., arXiv:1011.6116v2
RF-transport
![Page 14: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/14.jpg)
Ion trap QIP proposal
rf
rf
rf
![Page 15: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/15.jpg)
Ion trap QIP proposal
rf
rf
rf
![Page 16: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/16.jpg)
Ion trap QIP proposal
![Page 17: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/17.jpg)
Karin et al., arXiv:1011.6116v2
Ion trap QIP proposal
![Page 18: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/18.jpg)
Karin et al., arXiv:1011.6116v2
Pro: - can be micromotion-free - very compact
Con: - need RF amplitude and phase control
Ion trap QIP proposal
![Page 19: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/19.jpg)
• Introduction
• Quantum emulation
• Shuttling charged particles in 3D
• Comments on anomalous heating
• Conclusions
![Page 20: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/20.jpg)
1/d4
Anomalous heating
Naïve expectation at 300 K4 K
![Page 21: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/21.jpg)
E
dSources on conducting surface produce dipole field
Random dipole orientation
Noise spectral density over trap surface
r
A suggestion for a heating mechanism
- no shielding from bulk metal
- one monolayer of adsorbates is sufficient!
- at 10-11 mbar: one monolayer / day
Turchette et al., Phys. Rev. A 61 63418 (2000)
Daniilidis et al., New J. Phys. 13 013032 (2011)
![Page 22: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/22.jpg)
Log-uniform distribution of relaxation ratesΔU
Hints from the spectrum
1/f scaling
Nikos Daniliidis
![Page 23: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/23.jpg)
Plasma surface cleaning
Repeated cleaning / annealing cycles
1. Ar+ ion bombardment
- Ion energy 150 eV - 2 keV
- Beam diameter 5 mm – 20 mm
2. Anneal at 400oC – 800oC
3. Monitor surface contamination
See also NIST, Dustin Hite
![Page 24: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/24.jpg)
Trap testing and cleaning set-up
![Page 25: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/25.jpg)
Conclusion
/ww
w. p
hys
.sci
.os a
ka- u
.ac.
j p
Trapped ions Condensed matter
Emulation
Better traps
- Study physics of ion crystals in microtraps
- Transport in 3D of charged particles
- Candidate mechanism for anomalous heating
![Page 26: Trapped ions meet solid state physics - University of California](https://reader031.fdocuments.in/reader031/viewer/2022021308/620758f651489428fe75cd73/html5/thumbnails/26.jpg)
People
Greg Bolloton
Nikos Daniliidis
Dylan Gorman
Axel Kreuter
Gebhard Littich
Sönke Möller
Sankara Narayanan
Oliver Neitzke
Thaned (Hong) Pruttivarasin
Christopher Reilly
Michael Ramm
Ishan Taludkar