Comparative study of microwave radiation-induced magnetoresistive oscillations induced by circularly- and linearly- polarized photo-excitation.

Scientific reports · 2015 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 6571

Study snapshot

PublicationScientific reports · 2015

Study typeother

Reported directionUnclear

Evidence ratingInsufficient

Abstract

A comparative study of the radiation-induced magnetoresistance oscillations in the high mobility GaAs/AlGaAs heterostructure two dimensional electron system (2DES) under linearly- and circularly- polarized microwave excitation indicates a profound difference in the response observed upon rotating the microwave launcher for the two cases, although circularly polarized microwave radiation induced magnetoresistance oscillations observed at low magnetic fields are similar to the oscillations observed with linearly polarized radiation. For the linearly polarized radiation, the magnetoresistive response is a strong sinusoidal function of the launcher rotation (or linear polarization) angle, θ. For circularly polarized radiation, the oscillatory magnetoresistive response is hardly sensitive to θ.

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Study typeother

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

In a high mobility GaAs/AlGaAs 2D electron system, radiation-induced magnetoresistance oscillations at low magnetic fields under circularly polarized microwave excitation were reported as similar to those under linearly polarized excitation. The magnetoresistive response depended strongly and sinusoidally on launcher rotation angle θ for linearly polarized radiation, while it was reported as hardly sensitive to θ for circularly polarized radiation.

Outcomes measured

radiation-induced magnetoresistance oscillations
magnetoresistive response vs polarization angle (θ)

View raw extracted JSON

{
  "study_type": "other",
  "exposure": {
    "band": "microwave",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "radiation-induced magnetoresistance oscillations",
    "magnetoresistive response vs polarization angle (θ)"
  ],
  "main_findings": "In a high mobility GaAs/AlGaAs 2D electron system, radiation-induced magnetoresistance oscillations at low magnetic fields under circularly polarized microwave excitation were reported as similar to those under linearly polarized excitation. The magnetoresistive response depended strongly and sinusoidally on launcher rotation angle θ for linearly polarized radiation, while it was reported as hardly sensitive to θ for circularly polarized radiation.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave excitation",
    "circular polarization",
    "linear polarization",
    "magnetoresistance oscillations",
    "GaAs/AlGaAs",
    "2DES",
    "launcher rotation angle"
  ],
  "suggested_hubs": []
}

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Identifiers and source

DOI: 10.1038/srep14880
PubMed: 26450679

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