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Field-enhanced conductivity in Electron-Glasses PowerPoint PPT Presentation


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disorder. … Coulomb interactions. Field-enhanced conductivity in Electron-Glasses Suppression of Electron-Electron inelastic scattering in Anderson Insulators. Anderson insulator…. e. e. x. x. G(T=0)>0 Metal. G(T=0)=0 Insulator. = E lectron-Glass. … quench the sample from high T ….

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Field-enhanced conductivity in Electron-Glasses

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Field enhanced conductivity in electron glasses

disorder

… Coulomb interactions

Field-enhanced conductivity in Electron-Glasses

Suppression of Electron-Electron inelastic scattering in Anderson Insulators

Anderson insulator…

e

e

x

x

G(T=0)>0Metal

G(T=0)=0Insulator

= Electron-Glass


Field enhanced conductivity in electron glasses

…quench the sample from high T…

The basic phenomena

allsamples are in the 2D hopping regime

…and allare crystalline indium-oxide - In2O3-x

…all experiments done at T=4K

In2O3-x

…slow relaxation…

system goes towards lower energy


Field enhanced conductivity in electron glasses

…more ways to get it out of equilibrium...

…apply non-ohmic field F…(high voltage)

…or raise bath-temperature by DT…

…F and DT have qualitatively similar effect …


Field enhanced conductivity in electron glasses

… absorption measured via transport...

… absorption however, DOES depend on f...


Field enhanced conductivity in electron glasses

… and it becomes small above some f...

DG0

DG0is the samefor allf

…and F is keptfor the same time for allf

dGrelisNOT

…what determines the cross-over frequency ?


Field enhanced conductivity in electron glasses

…it is the rate of heat removal…

T, DT

g(T) is the rate heat is removed from the system

Celis the electron heat-capacity

N(0)=21045 J-1 m-3

V(6.1 MW)=0.3 V (rms)

V(12.5 MW)=1 V (rms)

g(6.1 MW)=3.5·105 Hz

g(12.5 MW)=7.1·105 Hz


Field enhanced conductivity in electron glasses

…but what about e-e inelastic rate ?!

gin (e-e)R(for weak disorder)


Field enhanced conductivity in electron glasses

…measuring the electron temperature…

sample

insulator

…the “memory-Dip (MD )

gate

…MD shape may be used as a thermometer...

…applied high frequency F...

…applied lowfrequency F...


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