Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Tunneling through a fluctuating barrier: two-level model

Iwaniszewski1

  • 1School of Physics and Chemistry, Lancaster University, United Kingdom. jan.iwaniszewski@phys.uni.torun.pl

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 14, 2000
PubMed
Summary

We studied quantum tunneling with a fluctuating barrier and dissipation. We found that barrier fluctuations can suppress or enhance tunneling, depending on the switching rate and system detuning, revealing complex quantum dynamics.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Resonances while surmounting a fluctuating barrier

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·2000
Same author

Escape over a fluctuating barrier: Limits of small and large correlation times.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·1996
Same author

Transient multimodality in relaxation from an unstable state.

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics·1994
Same author

Transient multimodality for the decay of unstable states.

Physical review. A, Atomic, molecular, and optical physics·1992

Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Statistical mechanics

Background:

  • Investigating quantum tunneling phenomena is crucial for understanding particle behavior in various physical systems.
  • Dissipation and random fluctuations significantly impact quantum dynamics, yet their interplay remains complex.
  • The two-level approximation provides a simplified yet effective model for studying such systems.

Purpose of the Study:

  • To analyze quantum tunneling across a randomly fluctuating barrier in a dissipative two-level system.
  • To explore the influence of barrier fluctuation dynamics, controlled by switching rate (nu), on tunneling probabilities.
  • To identify conditions leading to suppression or enhancement of coherent tunneling and resonant decay.

Main Methods:

Related Experiment Videos

  • Utilizing the two-level approximation to model the quantum system.
  • Introducing random telegraph noise to induce barrier fluctuations.
  • Controlling the system dynamics by varying the switching rate (nu) of the noise.
  • Analyzing the system's behavior in different regimes: infinitely fast, very small, and intermediate fluctuation rates.

    • Main Results:

    • For infinitely fast fluctuations, system dynamics resemble the static barrier case.
    • Very low switching rates (nu) lead to superposition of static solutions, causing resonant beating or periodic localization.
    • Intermediate switching rates exhibit a resonance-like suppression of coherent tunneling.
    • Detuning system levels results in resonant enhancement of decay in the incoherent regime.

    Conclusions:

    • Barrier fluctuation dynamics, governed by switching rate, critically determine quantum tunneling outcomes.
    • Coherent tunneling can be suppressed or enhanced, and localization effects emerge based on fluctuation characteristics.
    • The interplay of dissipation and fluctuating barriers leads to rich, non-intuitive quantum phenomena, including resonant decay.