Premium
Transport in the Electron‐Glass under Energy Pumping
Author(s) -
Orlyanchik V.,
Vaknin A.,
Ovadyahu Z.
Publication year - 2002
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200203)230:1<67::aid-pssb67>3.0.co;2-p
Subject(s) - conductance , ohmic contact , condensed matter physics , relaxation (psychology) , electron , electric field , excited state , physics , electrical resistivity and conductivity , atomic physics , materials science , quantum mechanics , electrode , psychology , social psychology
The conductance G of In 2 O 3— x films in the hopping regime has been measured as function of time for a fixed temperature and at various electric fields F . When F is switched at t = 0 from F 1 to F 2 > F 1 the conductance increases reflecting the non‐Ohmic nature of field assisted hopping. However, G ( F 2 , t ≥ 0) is observed to be non‐stationary – it increases with time in a sluggish manner. After F 2 is re‐adjusted to F 1 , the conductance slowly approaches its equilibrium value. The latter is presumably the slow relaxation process previously reported to occur in electron glasses excited far from equilibrium. The magnitudes of these non‐ergodic effects depend on F and vanish for F < F *, the field below which G is Ohmic. The temporal evolution of G ( F 2 ) is ascribed to the slow increase of the electron energy due to the action of F .