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

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Directly measure exciton-phonon scattering times, ,and mobilities, /m.1.5 mm1. Measure the force field directly:F = energy/distance.2. Measure the drift velocity:v = distance/timespace resolvetime resolveI lumslitscan10 -910 6 6 ideal gas)10 5(sec)cm 2eVs1010 4410 -11 1 30T(K)Selectedphoton energy(eV)3. Determine exciton mobilities: = F/v (Force drift velocity)m Energy (eV)Slit position, x(mm)
Now concentrate on the strain-confined luminescence:Temperature dependenceT25 KExcitonsExcitons(Maxwell Boltzman distribution of ideal gas)(nicely thermalized)1.5 mmSiGourley and Wolfe, PRL 18, 526 (1978)Energy (eV)
Page 1 and 2: Imaging Electron-Phonon Interaction
Page 3 and 4: 1. Probing Superconductivity with P
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: Directly measure exciton-phonon sca
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
Page 63 and 64: 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
Page 81 and 82: Imaging acoustic waves in a crystal
Page 91 and 92: Ultrasonic wave from a point source
Page 93 and 94: Compare pulse excitation to continu
Page 95 and 96: Ultrasound PhononsMHz GHzFTphononsS
Page 97 and 98: 3-d views of the slowness and wave
Page 99 and 100: 3-d views of the slowness and wave
Page 101 and 102:
3-d views of the slowness and wave
Page 103 and 104:
Time-resolved phonon propagationfro
Page 105 and 106:
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
Page 123 and 124:
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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