Imaging Electron-Phonon Interactions - University of Illinois at ...

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1. Probing Superconductivity with PhononsMetal at T > T c : T < T c :ElectronenergyElectronenergyE FFilledstatesDensity of states, D(E)Energygap T cT
1. Probing Superconductivity with PhononsMetal at T > T c : T < T c :ElectronenergyE FFilledstatesElectronenergyDensity of states, D(E)Energygap(semiconductor picture)D(E)Phonons with h > 2break Cooper pairs,producing quasiparticles(“free electrons”) T cTNumber of thermallygenerated quasiparticles:N(T) e - /kTElectronic specific heat:C(T) N(T) e - /kT
Page 1: Imaging Electron-Phonon Interaction
Page 5 and 6: Apparent Anomaly in the Specific He
Page 7 and 8: A Spin Density Wave Ground State?
Page 9 and 10: Describe the tool:Basic idea of Pho
Page 11 and 12: Experimental details (2)Scan laser
Page 13 and 14: Experimental details (2)Scan laser
Page 15 and 16: Basic idea of Phonon ImagingLaser b
Page 21 and 22: ResultPhonon images of superconduct
Page 23 and 24: Compare to theory for ballistic pho
Page 25 and 26: Kinetics of phonon-electron scatter
Page 27 and 28: Conclusion:Phonon absorption in (11
Page 29 and 30: Temperature Dependence of Absorptio
Page 31 and 32: Problem: : We must account for non-
Page 33 and 34: Isolating phonon absorption due to
Page 35 and 36: Conclusions• Phonon imaging is a
Page 37 and 38: Basic ideas:Photoexcitation of a se
Page 39 and 40: Photoexcited electrons and holesthe
Page 41 and 42: Compare properties ofexcitonsDemise
Page 43 and 44: Measuring the exciton diffusion con
Page 45 and 46: Look whathappens whena solid isstre
Page 47 and 48: Strain-confinement of Excitons in S
Page 49 and 50: Directly measure exciton-phonon sca
Page 51 and 52: Now concentrate on the strain-confi
Page 53 and 54:
Lower the temperature: Electron hol
Page 55 and 56:
Infrared image of a droplet cloud i
Page 57 and 58:
Stresses, Strains and Acoustic Anis
Page 59 and 60:
Stresses, Strains and Acoustic Anis
Page 61 and 62:
kV for a general propagation direct
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Graphic explanation of the oblique
Page 65 and 66:
Graphic explanation of the oblique
Page 67 and 68:
Constructing the Wave Surface“Slo
Page 69 and 70:
Origin of Folds in the Wave Surface
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Imaging acoustic waves in a crystal
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Ultrasonic wave from a point source
Page 93 and 94:
Compare pulse excitation to continu
Page 95 and 96:
Ultrasound PhononsMHz GHzFTphononsS
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3-d views of the slowness and wave
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Time-resolved phonon propagationfro
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Phonon focusing explains the shapeo
Page 107 and 108:
Longitudinal phonons are strongly a
Page 109 and 110:
Probing Internal properties of Elec
Page 111 and 112:
Probing Internal properties of Elec
Page 113 and 114:
Imaging Electron-Phonon Interaction
Page 115 and 116:
Principal experimental requirements
Page 117 and 118:
Spatial Filtering Technique(Isolate
Page 119 and 120:
Results:Measurement of Dispersive G
Page 121 and 122:
Results:Measurement of Dispersive G
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Quantitative Analysis of Focusing P
Page 125 and 126:
Quantitative Analysis of Focusing P
Page 127 and 128:
Simulations of Ballistic Flux(using
Page 129 and 130:
Refitting the Bond-Charge Model to
Page 131 and 132:
ExcitonersGrad students and Collabo
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