XXXIV International School on the Physics of Semiconducting ...

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Images of electron flow2.74 µm from QPC 1.96 µm from QPC 1.20 µm from QPC∆G (e 2 /h)0.00 0.1350 nm 50 nm50 nm0.00 0.35 0.00 0.55E FE FTipQPCMovies range from 0.0 mV to 3.1 mV in steps of 0.15 mV
Measuring electron energyFringe spacing indicates energy of electrons
Page 1:
Imaging Coherent Electron FlowBrian
Page 5 and 6:
Two-dimensional electron gasQuantum
Page 8 and 9:
Quantum point contactsElectrons flo
Page 10 and 11:
Quantum point contacts-quantization
Page 12 and 13:
Quantum point contact-energy levels
Page 14 and 15:
Outline• Introduction• Measurem
Page 16 and 17:
Liquid helium temperature scanning
Page 18 and 19:
Experimental techniqueAFM Cantileve
Page 20 and 21:
Effect of tip height10 nm 15 nm 20
Page 22 and 23:
Quantum mechanical simulationGatesT
Page 24 and 25:
Imaging requirementsPerturbation fr
Page 26 and 27:
Topinka, LeRoy et al., Science 289,
Page 28 and 29:
Opening QPCNew Modes of current onl
Page 30 and 31:
Extracting a modal patternExperimen
Page 32 and 33:
Selective mode suppressionNo TipTip
Page 34 and 35: Coherent electron flow through a 2D
Page 36 and 37: Simulated imageDoes the presence of
Page 38 and 39: Unperturbed Currentand Tip Perturba
Page 40 and 41: Formation of CausticsClassical Traj
Page 42 and 43: Shifting QPCUnequal voltage on QPC
Page 44 and 45: Imaging a QPCImaged electron flow n
Page 46 and 47: Interference fringesPresence of int
Page 48 and 49: Finite temperature- thermal smearin
Page 50 and 51: Thermal smearing (continued)As the
Page 52 and 53: Fringe persistenceFringe Size (%)Di
Page 54 and 55: Fringe persistence far from the QPC
Page 56 and 57: Scattering induced fringe enhanceme
Page 58 and 59: Single BounceFringe movementDouble
Page 60 and 61: Fringe amplitudeFringes enhancedRef
Page 62 and 63: Temperature dependenceIncreased tem
Page 64 and 65: Outline• Introduction• Measurem
Page 66 and 67: Electron densityFree electrons in t
Page 68 and 69: Effect of reducing Fermi energyBack
Page 70 and 71: Is it really local?Calculate spacin
Page 72 and 73: Electron densityInterference fringe
Page 74 and 75: Electron opticsCreate elements to e
Page 76 and 77: Electron optics element - prism1µm
Page 78 and 79: Electron optics element - channel
Page 80 and 81: Outline• Introduction• Measurem
Page 82 and 83: DC bias techniqueNo Energy LossCond
Page 86 and 87: Measuring e-e scattering lengthElec
Page 88 and 89: Differential conductance vs. excess
Page 90 and 91: InteractionsImages are sensitive to
Page 92 and 93: Image pattern of electronflow from
Page 94 and 95: Improved fringe resolutionWiggling
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XXXIV International School on the Physics of Semiconducting ...

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