Coulomb gap
E484704
The Coulomb gap is a soft depletion of electronic states near the Fermi level in disordered or localized systems, arising from long-range electron–electron interactions.
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
electronic correlation effect
ⓘ
many-body effect ⓘ physical phenomenon ⓘ |
| affects | single-particle density of states ⓘ |
| assumes |
localized electronic states
ⓘ
poor screening of Coulomb interaction ⓘ |
| characterizedAs | soft gap ⓘ |
| consequenceOf | stability of ground state against single-electron excitations ⓘ |
| dependsOn |
carrier concentration
ⓘ
dimensionality of the system ⓘ disorder strength ⓘ screening of Coulomb interaction ⓘ |
| differentFrom | hard band gap ⓘ |
| effect |
soft depletion of electronic states
ⓘ
suppression of density of states at Fermi level ⓘ |
| energyScale | interaction energy between localized electrons ⓘ |
| field |
condensed matter physics
ⓘ
disordered systems ⓘ electron transport ⓘ mesoscopic physics ⓘ |
| hasCause |
Coulomb repulsion
ⓘ
long-range electron–electron interactions ⓘ |
| influences |
noise properties in disordered conductors
ⓘ
nonlinear current–voltage characteristics ⓘ |
| inThreeDimensions | density of states proportional to E^2 near Fermi level ⓘ |
| inTwoDimensions | density of states proportional to |E| near Fermi level ⓘ |
| leadsTo | Efros–Shklovskii variable-range hopping law NERFINISHED ⓘ |
| mathematicalForm | power-law suppression of density of states ⓘ |
| observedBy |
photoemission spectroscopy
ⓘ
transport measurements ⓘ tunneling spectroscopy ⓘ |
| occursIn |
Anderson insulators
NERFINISHED
ⓘ
amorphous semiconductors ⓘ disordered electronic systems ⓘ doped semiconductors ⓘ granular metals ⓘ hopping conductors ⓘ localized electronic systems ⓘ two-dimensional electron systems ⓘ |
| occursNear | Fermi level NERFINISHED ⓘ |
| predictedBy |
Alexandre Efros
NERFINISHED
ⓘ
Boris Shklovskii NERFINISHED ⓘ |
| predictionYear | 1975 ⓘ |
| relatedTo |
Anderson localization
NERFINISHED
ⓘ
Coulomb blockade ⓘ Mott variable-range hopping NERFINISHED ⓘ |
| relevantFor | variable-range hopping conductivity ⓘ |
| temperatureDependence | influences low-temperature conductivity ⓘ |
| theory | Efros–Shklovskii theory NERFINISHED ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.