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We propose that zero-point fluctuations of phase coherent electrons are responsible for the observed saturation

Intrinsic Decoherence in Mesoscopic Systems

Pattern Recognition Letters, (1998)

Cited: 480|Views19
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Abstract

We present measurements of the phase coherence time tf in six quasi-1D Au wires and clearly show that tf is temperature independent at low temperatures. We suggest that zero-point fluctuations of the phase coherent electrons are responsible for the observed saturation of tf. We introduce a new functional form for the temperature dependenc...More

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Introduction
  • The authors present measurements of the phase coherence time tf in six quasi-1D Au wires and clearly show that tf is temperature independent at low temperatures.
  • The authors propose that zero-point fluctuations of phase coherent electrons are responsible for the observed saturation.
  • In Fig. 3, the authors compare the temperature dependence of tf for one sample before and after implantation of ϳ2.8 ppm of Fe. The effect of adding magnetic impurities is to lower the magnitude of the phase coherence time, but not to cause saturation in tfT.
Highlights
  • We present measurements of the phase coherence time tf in six quasi-1D Au wires and clearly show that tf is temperature independent at low temperatures
  • We propose that zero-point fluctuations of phase coherent electrons are responsible for the observed saturation
  • We believe that the origin of the observed saturation in tf is that the zero-point fluctuations of the phase coherent electrons are playing an important role in the dephasing process
  • We propose that zero-point fluctuations of the intrinsic electromagnetic environment [16] seen by the phase coherent electrons should cause intrinsic dephasing and lead to a finite temperature saturation of tf
  • At low temperatures, one very simple form fits the temperature dependence of tfTfor all our
  • We suggest that zero-point fluctuations are responsible for this observed saturation and introduce both a functional form for the temperature dependence and a calculation for the saturation value for the phase coherence time
Results
  • The low temperature data is clearly temperature dependent in agreement with previous experiments [12,13].
  • The authors believe that the origin of the observed saturation in tf is that the zero-point fluctuations of the phase coherent electrons are playing an important role in the dephasing process.
  • The authors propose that zero-point fluctuations of the intrinsic electromagnetic environment [16] seen by the phase coherent electrons should cause intrinsic dephasing and lead to a finite temperature saturation of tf.
  • If Eq (1) truly describes the temperature dependence of the phase coherence time for the samples, it should apply to all 1D and 2D mesoscopic systems fabricated from metals and semiconductors.
  • Fits the reported phase coherence time extremely well with the constant a reduced only by a factor of p due to the
  • As shown in Table I, the fits to Eq (1) describe all the published data extremely well including the high temperature part of the data and give them further confidence that this zeropoint dephasing mechanism correctly describes the essential physics of the phase coherence time for all mesoscopic samples.
  • The authors report a comprehensive set of experiments in 1D gold wires, which clearly shows that the phase coherence time saturates at a finite temperature.
Conclusion
  • The authors suggest that zero-point fluctuations are responsible for this observed saturation and introduce both a functional form for the temperature dependence and a calculation for the saturation value for the phase coherence time.
  • The authors find that all the data as well as the data from many other groups on a wide variety of systems including 1D wires, and 2D films can be fit quite well to the form given in Eq (1) essentially with only one adjustable parameter, t0, the zero temperature phase coherence time.
  • For the first time, to theoretically calculate t0 for any 1D mesoscopic system from only RL and D, and the agreement between the calculated value and measured value of t0 is extremely good in the as well as others’ experiments.
Tables
  • Table1: Parameters of the samples shown in Figs. 1 – 4
Download tables as Excel
Funding
  • This work is supported by the NSF under Contract No DMR9510416
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