TY - JOUR

T1 - Decay of metastable current states in one-dimensional resonant tunneling devices

AU - Tretiakov, O. A.

AU - Matveev, K. A.

N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.

PY - 2006

Y1 - 2006

N2 - Current switching in a double-barrier resonant tunneling structure is studied in the regime where the current-voltage characteristic exhibits intrinsic bistability, so that in a certain range of bias two different steady states of current are possible. Near the upper boundary Vth of the bistable region the upper current state is metastable, and because of the shot noise it eventually decays to the stable lower current state. We find the time of this switching process in strip-shaped devices, with the width small compared to the length. As the bias V is tuned away from the boundary value Vth of the bistable region, the mean switching time τ increases exponentially. We show that in long strips ln τ (Vth -V)5/4, whereas in short strips ln τ (Vth -V)3/2. The one-dimensional geometry of the problem enables us to obtain analytically exact expressions for both the exponential and the prefactor of τ. Furthermore, we show that, depending on the parameters of the system, the switching can be initiated either inside the strip, or at its ends.

AB - Current switching in a double-barrier resonant tunneling structure is studied in the regime where the current-voltage characteristic exhibits intrinsic bistability, so that in a certain range of bias two different steady states of current are possible. Near the upper boundary Vth of the bistable region the upper current state is metastable, and because of the shot noise it eventually decays to the stable lower current state. We find the time of this switching process in strip-shaped devices, with the width small compared to the length. As the bias V is tuned away from the boundary value Vth of the bistable region, the mean switching time τ increases exponentially. We show that in long strips ln τ (Vth -V)5/4, whereas in short strips ln τ (Vth -V)3/2. The one-dimensional geometry of the problem enables us to obtain analytically exact expressions for both the exponential and the prefactor of τ. Furthermore, we show that, depending on the parameters of the system, the switching can be initiated either inside the strip, or at its ends.

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U2 - 10.1103/PhysRevB.73.115302

DO - 10.1103/PhysRevB.73.115302

M3 - Article

AN - SCOPUS:33644626218

VL - 73

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 0163-1829

IS - 11

M1 - 115302

ER -