2006
DOI: 10.1103/physrevb.73.113309
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Tuning bistability and current hysteresis in resonant-tunneling structures

Abstract: We present a time-dependent quantum kinetic simulation on the nonequilibrium electron transport of the symmetrical and asymmetrical double-barrier resonant-tunneling devices with various thickness of barriers. We obtain two bistabilities and hystereses of current found in experiments. Our calculations show that the physical mechanisms are different for the two bistabilities. The first bistability is mainly due to the charge accumulation in the quantum well and the second bistability and hysteresis is related t… Show more

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Cited by 8 publications
(11 citation statements)
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“…This is in agreement with our earlier findings that a net spin polarization in asymmetrically biased QPC in the presence of LSOC can only be observed when there is sufficient electron-electron interaction in the device [7,11]. The hysteresis shown in Fig.2 is similar to the one observed in the NDR regions of resonant tunneling devices [18][19][20][21][22] and is linked to the feedback of space-charge effects in the narrow portion of the QPC in the presence of LSOC. The NDR regions in the forward and reverse sweeps are linked to multiple reflections between the edges of the narrow portion of the QPC [11,12].…”
supporting
confidence: 80%
“…This is in agreement with our earlier findings that a net spin polarization in asymmetrically biased QPC in the presence of LSOC can only be observed when there is sufficient electron-electron interaction in the device [7,11]. The hysteresis shown in Fig.2 is similar to the one observed in the NDR regions of resonant tunneling devices [18][19][20][21][22] and is linked to the feedback of space-charge effects in the narrow portion of the QPC in the presence of LSOC. The NDR regions in the forward and reverse sweeps are linked to multiple reflections between the edges of the narrow portion of the QPC [11,12].…”
supporting
confidence: 80%
“…Theoretical work by several other groups predicted the same phenomenon [13][14][15][16] . It has been suggested that the RTD intrinsic current oscillations could circumvent the low-power problem and lead to THz-frequency power in the milli-watt range 12 .…”
Section: Introductionmentioning
confidence: 67%
“…Scattering is treated microscopically within the WBTE, with rates obtained from time-dependent perturbation theory (Fermi's golden rule) 22 . Our treatment of scattering is more detailed than in earlier work, where scattering was either neglected 23 or was treated using the relaxation-time approximation with a constant (energyindependent) relaxation time [13][14][15] . We show that the current oscillations are associated with the EQW and MQW ground states being periodically and adiabatically tuned in and out of alignment due to a charge redistribution.…”
Section: Introductionmentioning
confidence: 99%
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“…Therefore, we can analyze the effect of V g to the electron transfer. 30 It seems that their electron conductions via tunneling barriers and quasibound states ͑including atoms and defects͒ are related to the hysteresis phenomena in their results and the proposed mechanisms. In the I d -V g characteristic without UV irradiation ͑dark condition͒, the conduction behavior having a couple of current peaks and valleys in the negative V g region was observed at room temperature.…”
mentioning
confidence: 99%