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Quasiuniversal transient behavior of a nonequilibrium Mott insulator driven by an electric field.

Physical review letters · 2012 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3176

Using a self-consistent strong-coupling expansion, the authors model the 3D homogeneous Fermi-Hubbard system driven by an external electric field. They report that Bloch-oscillation damping depends on field direction and that a long-lived transient prethermal…

Study snapshot

PublicationPhysical review letters · 2012
Study typeother
Reported directionUnclear
Evidence ratingInsufficient

Abstract

We use a self-consistent strong-coupling expansion for the self-energy (perturbation theory in the hopping) to describe the nonequilibrium dynamics of strongly correlated lattice fermions. We study the three-dimensional homogeneous Fermi-Hubbard model driven by an external electric field showing that the damping of the ensuing Bloch oscillations depends on the direction of the field and that for a broad range of field strengths a long-lived transient prethermalized state emerges. This long-lived transient regime implies that thermal equilibrium may be out of reach of the time scales accessible in present cold atom experiments but shows that an interesting new quasiuniversal transient state exists in nonequilibrium governed by a thermalized kinetic energy but not a thermalized potential energy. In addition, when the field strength is equal in magnitude to the interaction between atoms, the system undergoes a rapid thermalization, characterized by a different quasiuniversal behavior of the current and spectral function for different values of the hopping.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeother
Effect directionunclear
PopulationNot supplied
Sample sizeNot supplied
ExposureNot supplied
Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

Using a self-consistent strong-coupling expansion, the authors model the 3D homogeneous Fermi-Hubbard system driven by an external electric field. They report that Bloch-oscillation damping depends on field direction and that a long-lived transient prethermalized state occurs over a broad range of field strengths; when the field strength matches the interaction magnitude, rapid thermalization occurs with different quasiuniversal behavior of current and spectral function across hopping values.

Outcomes measured

  • nonequilibrium dynamics
  • damping of Bloch oscillations
  • prethermalized transient state emergence
  • thermalization behavior
  • current
  • spectral function

Limitations

  • The work is theoretical/model-based (Fermi-Hubbard model) rather than an empirical exposure study.
  • No quantitative exposure metrics (e.g., field strength units, frequencies) are provided in the abstract.
  • Relevance to biological/health outcomes is not addressed in the abstract.
View raw extracted JSON
{
  "study_type": "other",
  "exposure": {
    "band": null,
    "source": "external electric field (theoretical model)",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "nonequilibrium dynamics",
    "damping of Bloch oscillations",
    "prethermalized transient state emergence",
    "thermalization behavior",
    "current",
    "spectral function"
  ],
  "main_findings": "Using a self-consistent strong-coupling expansion, the authors model the 3D homogeneous Fermi-Hubbard system driven by an external electric field. They report that Bloch-oscillation damping depends on field direction and that a long-lived transient prethermalized state occurs over a broad range of field strengths; when the field strength matches the interaction magnitude, rapid thermalization occurs with different quasiuniversal behavior of current and spectral function across hopping values.",
  "effect_direction": "unclear",
  "limitations": [
    "The work is theoretical/model-based (Fermi-Hubbard model) rather than an empirical exposure study.",
    "No quantitative exposure metrics (e.g., field strength units, frequencies) are provided in the abstract.",
    "Relevance to biological/health outcomes is not addressed in the abstract."
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "nonequilibrium dynamics",
    "Mott insulator",
    "Fermi-Hubbard model",
    "electric field",
    "Bloch oscillations",
    "prethermalization",
    "thermalization",
    "strong-coupling expansion",
    "spectral function",
    "current"
  ],
  "suggested_hubs": []
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1103/physrevlett.109.260402
PubMed: 23368540

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