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Self-induced shapiro effect in semiconductor superlattices

Loser1, Dignam, Kosevich

  • 1Institut fur Angewandte Photophysik, Technische Universitat Dresden, 01062 Dresden, Germany.

Physical Review Letters
|November 18, 2000
PubMed
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We discovered a novel quantum effect in semiconductor superlattices where Bloch oscillations generate a coherent current. This effect, controllable via laser light, allows for directed electron movement within the material.

Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Semiconductor Physics

Background:

  • Semiconductor superlattices exhibit Bloch oscillations, the periodic motion of charge carriers in a crystal lattice under an electric field.
  • Coherent quantum phenomena are crucial for developing advanced electronic and photonic devices.

Purpose of the Study:

  • To investigate the macroscopic quantum effects accompanying Bloch oscillations in biased semiconductor superlattices.
  • To explore the control mechanisms for coherent carrier dynamics using external stimuli.

Main Methods:

  • Theoretical analysis of photoinjected electron-hole pair dynamics in biased semiconductor superlattices.
  • Investigation of the interaction between carriers and self-induced oscillating fields.
  • Utilizing spectral control of exciting laser pulses to manipulate wave packet oscillations.

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Main Results:

  • Observation of a coherent quasi-direct current (dc) generated alongside Bloch oscillations.
  • Identification of this phenomenon as a macroscopic quantum effect, analogous to the Shapiro effect in Josephson junctions.
  • Demonstration that laser pulse spectral position dictates the amplitude and phase of wave packet oscillations, enabling controlled electron driving.

Conclusions:

  • Bloch oscillations in semiconductor superlattices can generate a controllable coherent quasi-dc current.
  • This effect offers a novel method for coherently manipulating electron motion within the superlattice potential.
  • The findings open new avenues for quantum control in semiconductor systems.