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arxiv: 2507.05487 · v2 · submitted 2025-07-07 · ❄️ cond-mat.str-el

Elementary Steps of Energy Conversion in Strongly Correlated Systems: Beyond Single Quasiparticles and Rigid Bands

V. Moshnyaga , Ch. Jooss , P. E. Bl\"ochl , V. Bruchmann-Bamberg , A. Dehning , L. Allen-Rump , C. Hausmann , M. Kr\"uger
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A. Rathnakaran S. Rajpurohit D. Steil C. Flathmann J. Hoffmann M. Seibt C. Volkert
This is my paper

Pith reviewed 2026-05-19 05:10 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords strongly correlated systemsmanganitesquasiparticlesenergy conversionphase transitionselectron correlationsphotovoltaicsthermal transport
0
0 comments X p. Extension

The pith

Energy conversion in strongly correlated systems requires models where quasiparticle nature and interactions change during the process.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper reviews how energy conversion unfolds as a sequence of elementary steps in materials with strong correlations, using manganite perovskite oxides to illustrate the effects. It shows that electron-phonon, electron-electron, and spin-spin correlations compete and drive temperature- and field-induced phase transitions that alter excitations and electronic structure. These changes affect friction, thermal transport, optical responses, and photovoltaic processes in ways single quasiparticle or rigid-band pictures cannot capture. A reader would care because many energy-related materials exhibit such correlations, and the breakdown into low-energy thermal and high-energy optical excitations provides a practical way to track their interactions and conversions.

Core claim

In manganite perovskites the nature and interactions of quasiparticles can change during excitation, transport, and phase transitions, thereby modifying the electronic structure. At sufficiently high stimulation, quasiparticle excitations can induce or actuate phase transitions. This yields a comprehensive understanding of energy conversion steps that extends beyond the single quasiparticle pictures and rigid band approximations familiar from conventional semiconductors.

What carries the argument

Models of interacting and tunable quasiparticles whose nature and interactions evolve during excitation, transport, and phase transitions.

If this is right

  • Surface friction arises from correlation-driven low-energy excitations rather than conventional scattering.
  • Thermal transport is governed by the interplay of multiple correlation types instead of simple phonon or electron diffusion.
  • Optical excitations become time-, energy-, and power-dependent because electronic structure changes with stimulation level.
  • Photovoltaic conversion efficiency is modified by correlation-induced phase transitions that respond to incident light intensity.
  • High-intensity stimulation can trigger phase transitions through quasiparticle excitations, enabling active control of material state.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same breakdown into low- and high-energy excitations could be used to analyze energy conversion in other perovskite families.
  • External fields or stimuli might be tuned to steer phase transitions and thereby improve conversion efficiency in devices.
  • Theoretical simulations of tunable quasiparticles could identify new correlated materials with targeted transport or optical properties.

Load-bearing premise

Manganite perovskite oxides capture the essential interplay of correlations that occurs across strongly correlated materials in general.

What would settle it

Measurements on other strongly correlated materials that show all energy conversion steps fully explained by fixed single quasiparticles and unchanging rigid bands would contradict the claimed need for dynamic quasiparticle models.

Figures

Figures reproduced from arXiv: 2507.05487 by A. Dehning, A. Rathnakaran, C. Flathmann, C. Hausmann, Ch. Jooss, C. Volkert, D. Steil, J. Hoffmann, L. Allen-Rump, M. Kr\"uger, M. Seibt, P. E. Bl\"ochl, S. Rajpurohit, V. Bruchmann-Bamberg, V. Moshnyaga.

Figure 1
Figure 1. Figure 1: Redrawn phase diagrams of manganites: a) LSMO ( [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 3
Figure 3. Figure 3: shows [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figure 4
Figure 4. Figure 4 [PITH_FULL_IMAGE:figures/full_fig_p018_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: shows correlation [PITH_FULL_IMAGE:figures/full_fig_p021_4.png] view at source ↗
Figure 4
Figure 4. Figure 4: High resolution transmission electron microscopy ((a) [PITH_FULL_IMAGE:figures/full_fig_p022_4.png] view at source ↗
Figure 5.1
Figure 5.1. Figure 5.1: Electronic states, band structure and quasiparticle excitations in materials with strong electron￾phonon correlations. (a) Scheme of lift of the degeneracy of 3d states in Jahn-Teller (JT) active transition metals by crystal field and JT effect for the example of Mn3+. This type of coupling of the electron state to lattice distortion is the origin of polaronic effects in many 3d transition metal oxides. … view at source ↗
Figure 5
Figure 5. Figure 5: a) into the empty orbital of the neighboring site. [PITH_FULL_IMAGE:figures/full_fig_p025_5.png] view at source ↗
Figure 5
Figure 5. Figure 5 [PITH_FULL_IMAGE:figures/full_fig_p026_5.png] view at source ↗
Figure 5
Figure 5. Figure 5 [PITH_FULL_IMAGE:figures/full_fig_p027_5.png] view at source ↗
Figure 6.1
Figure 6.1. Figure 6.1: a) [PITH_FULL_IMAGE:figures/full_fig_p029_6_1.png] view at source ↗
Figure 6.2
Figure 6.2. Figure 6.2: (a) Sketch of proposed magnetization state below and at T [PITH_FULL_IMAGE:figures/full_fig_p030_6_2.png] view at source ↗
Figure 7.2
Figure 7.2. Figure 7.2: Hot polaron quasiparticle with ns lifetime in a charge and orbital ordered ground state of a manganite. [PITH_FULL_IMAGE:figures/full_fig_p034_7_2.png] view at source ↗
Figure 7.3
Figure 7.3. Figure 7.3: shows photovoltaic properties of manganite-titanite junctions consisting of 3D perovskite Pr1-xCaxMnO3 with x=0.1, x=0.35 and x=0.95 as well as of the layered n=1 and n=2 [PITH_FULL_IMAGE:figures/full_fig_p035_7_3.png] view at source ↗
Figure 7
Figure 7. Figure 7: b) shows a specific example [PITH_FULL_IMAGE:figures/full_fig_p036_7.png] view at source ↗
Figure 7.4
Figure 7.4. Figure 7.4: Band scheme of the charge separating interface of manganite [PITH_FULL_IMAGE:figures/full_fig_p036_7_4.png] view at source ↗
read the original abstract

Energy conversion in materials can be considered as a sequence of elementary steps initiated by a primary excitation. While these steps are quite well understood in classical semiconductors in terms of quasiparticle (QP) excitations and interactions, their understanding in strongly correlated materials is still elusive. Here, we review the progress which has been achieved over recent years by studies of manganite perovskite oxides as a model system for materials with strong correlations. They show a subtle interplay of different types of correlations, i.e., electron-phonon, electron-electron and spin-spin, resulting in rich physical phenomena due to competition between different ground states accompanied by temperature- and field-induced phase transitions. They strongly impact various types of energy conversion and transport processes including friction at surfaces, thermal transport, time-, energy- and power-dependent optical excitations as well as photovoltaic energy conversion. The underlying microscopic processes can be broken down to the behavior of the low-energy thermal and high-energy optical excitations, their interactions, transport and conversion which are theoretically analyzed by using models of interacting and tunable QPs: Their nature and interactions can change during excitation, transport and phase transitions, thus modifying electronic structure. At sufficiently high stimulation, QP excitations can even induce or actuate phase transitions. As a result, we obtained a comprehensive understanding of energy conversion steps going far beyond single QP pictures and rigid band approximations well-known for conventional semiconductors.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. This review examines energy conversion in strongly correlated materials by analyzing elementary steps initiated by primary excitations, using manganite perovskite oxides as a model system. It emphasizes the interplay of electron-phonon, electron-electron, and spin-spin correlations that produce competing ground states and temperature- or field-induced phase transitions, affecting processes such as surface friction, thermal transport, time- and energy-dependent optical excitations, and photovoltaic conversion. Theoretical analysis relies on models of interacting and tunable quasiparticles whose nature and interactions evolve during excitation, transport, and transitions, thereby modifying the electronic structure; at high stimulation these excitations can induce phase transitions. The manuscript concludes that this framework yields a comprehensive understanding of energy conversion steps that goes far beyond single-quasiparticle pictures and rigid-band approximations characteristic of conventional semiconductors.

Significance. If the synthesis is accurate, the review offers a coherent organizing framework that links multiple experimental probes of manganites to a unified picture of dynamic correlations in energy-conversion pathways. By treating quasiparticle properties as stimulus-dependent rather than fixed, the approach could help identify design principles for correlated materials in energy applications. The review format itself is a strength, as it aggregates disparate transport, optical, and photovoltaic observations under a single conceptual umbrella.

major comments (2)
  1. [Abstract / concluding section] Abstract and concluding section: The central claim that the analysis yields understanding 'going far beyond single QP pictures and rigid band approximations' is load-bearing for the manuscript's contribution. The text describes the theoretical tools as 'models of interacting and tunable QPs' whose 'nature and interactions can change during excitation, transport and phase transitions'. It remains unclear whether these models introduce excitations or dynamics that cannot be captured by any effective quasiparticle theory (even with stimulus-dependent renormalization), or whether they remain within an extended QP paradigm. An explicit contrast—perhaps in a dedicated subsection—between the tunable-QP description and what can already be achieved by parameter-renormalized single-QP or rigid-band models would be required to substantiate the 'beyond' assertion.
  2. [Model system introduction] Section introducing the model system: The generalization that manganites constitute a representative platform whose correlation interplay can guide understanding of energy conversion in other strongly correlated materials is stated without detailed justification. While manganites exhibit rich phase competition, the specific balance of electron-phonon, electron-electron, and spin correlations may not map directly onto other families (e.g., cuprates or nickelates). A short paragraph enumerating which features are expected to be universal versus material-specific would strengthen the broader applicability claim.
minor comments (2)
  1. [Throughout / notation] Notation for quasiparticle parameters is introduced in the abstract but would benefit from a compact table or glossary in the main text that distinguishes fixed versus stimulus-dependent quantities.
  2. [Optical excitations / photovoltaic sections] Several cited experimental studies on optical excitations and photovoltaics are referenced only by author-year; adding a short summary table of key observables (e.g., excitation density thresholds for phase switching) would improve readability.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We are grateful to the referee for the thorough review and valuable feedback on our manuscript. The comments have helped us to clarify and strengthen our presentation of the key ideas. Below, we provide point-by-point responses to the major comments.

read point-by-point responses

  1. Referee: [Abstract / concluding section] Abstract and concluding section: The central claim that the analysis yields understanding 'going far beyond single QP pictures and rigid band approximations' is load-bearing for the manuscript's contribution. The text describes the theoretical tools as 'models of interacting and tunable QPs' whose 'nature and interactions can change during excitation, transport and phase transitions'. It remains unclear whether these models introduce excitations or dynamics that cannot be captured by any effective quasiparticle theory (even with stimulus-dependent renormalization), or whether they remain within an extended QP paradigm. An explicit contrast—perhaps in a dedicated subsection—between the tunable-QP description and what can already be achieved by parameter-renormalized single-QP or rigid-band models would be required to substantiate the 'beyond' assertion.

    Authors: We thank the referee for this insightful comment on the central claim of our review. We acknowledge that the distinction could be made more explicit to better substantiate the 'beyond' assertion. Accordingly, in the revised manuscript, we have included a dedicated subsection in the concluding section. This subsection contrasts the tunable quasiparticle models, where the nature of the excitations evolves with the stimulus (e.g., transitioning from electron-phonon dressed states to spin-coupled excitations during phase transitions), with conventional approaches that rely on fixed quasiparticles with renormalized parameters or rigid bands. We illustrate how this evolution enables description of phenomena such as stimulus-induced phase transitions that lie outside the scope of static renormalization. revision: yes

  2. Referee: [Model system introduction] Section introducing the model system: The generalization that manganites constitute a representative platform whose correlation interplay can guide understanding of energy conversion in other strongly correlated materials is stated without detailed justification. While manganites exhibit rich phase competition, the specific balance of electron-phonon, electron-electron, and spin correlations may not map directly onto other families (e.g., cuprates or nickelates). A short paragraph enumerating which features are expected to be universal versus material-specific would strengthen the broader applicability claim.

    Authors: We appreciate the referee's suggestion regarding the broader applicability of manganites as a model system. To address this, we have added a short paragraph in the section introducing the model system. This paragraph specifies that universal aspects include the interplay of multiple correlation types leading to competing ground states and phase transitions that influence energy conversion processes, which may apply to other strongly correlated materials such as cuprates and nickelates. Material-specific features, including the dominant role of Jahn-Teller electron-phonon coupling in manganites, are distinguished from cases where electron-electron or spin correlations play a more primary role in other families. revision: yes

Circularity Check

0 steps flagged

Review aggregates external literature; minor self-citation risk but central claim independent

full rationale

This is a review paper summarizing progress on manganite perovskites as a model system for correlated energy conversion processes. The central claim of understanding 'going far beyond single QP pictures and rigid band approximations' is framed as the outcome of analyzing experimental and theoretical literature on these materials, not as a new derivation from first principles or fitted parameters within the paper itself. No equations or model constructions are shown that reduce by definition to the inputs. While author overlap with prior manganite studies exists, the review structure draws on a broader body of work, and the 'beyond QP' assertion rests on the described interplay of correlations and phase transitions rather than a self-referential loop. This qualifies as a normal, non-circular review outcome.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Only the abstract is available. No explicit free parameters, axioms, or invented entities are introduced in the provided text; the review relies on prior literature for models of interacting quasiparticles.

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