arxiv: 2605.02322 · v1 · submitted 2026-05-04 · ❄️ cond-mat.mes-hall · quant-ph

Generation of heat pulses in mesoscopic conductors using light fields

Pedro Portugal , Riku Tuovinen , Christian Flindt This is my paper

Pith reviewed 2026-05-08 19:03 UTC · model grok-4.3

classification ❄️ cond-mat.mes-hall quant-ph

keywords heat pulsesmesoscopic conductorslight fieldstemperature modulationcaloritronicsquantum point contacttime-dependent transportcharge-neutral pulses

0 comments p. Extension

The pith

Light fields can modulate electrode temperature to generate controllable charge-neutral heat pulses in mesoscopic conductors.

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

The paper proposes that interactions with a light field can induce a controllable time-dependent temperature in an electronic reservoir. These temperature changes produce heat pulses that carry energy without net charge, which then propagate into a mesoscopic conductor. A tight-binding model of two reservoirs connected by a quantum point contact is used to compute the resulting time-dependent currents and fluctuations. This provides an alternative to voltage-driven single-electron sources for studying heat flow. The work points toward caloritronics in which energy rather than charge transmits quantum information.

Core claim

Interactions with a light field induce a controllable time-dependent temperature in an electrode. The temperature modulations generate charge-neutral heat pulses that can be emitted into a mesoscopic conductor and detected in the outputs. This is illustrated by evaluating the time-dependent currents and their fluctuations using a tight-binding model of two electronic reservoirs connected by a quantum point contact.

What carries the argument

Light-induced controllable time-dependent temperature modulation in the electrode that drives emission of charge-neutral heat pulses.

If this is right

Time-dependent currents and fluctuations appear at the conductor outputs and can be calculated explicitly.
The approach supplies an on-demand source of energy pulses for caloritronic experiments.
Thermally driven conductors become accessible for time-resolved studies of heat transport and quantum coherence.
Energy rather than charge becomes a carrier of quantum information in mesoscopic systems.

Where Pith is reading between the lines

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

Optical control of local temperature could reduce electrical noise in heat-transport measurements compared with voltage gates.
Similar light modulation might be applied to other mesoscopic elements such as quantum dots to create localized thermal excitations.
Interference experiments between multiple light-generated heat pulses could test their quantum coherence properties.

Load-bearing premise

Light-field interactions produce a clean time-dependent temperature modulation in the electrode without significant charge injection or decoherence that would mix charge and heat signals.

What would settle it

A measurement that finds heat pulses whose amplitude fails to track the applied light intensity while charge currents remain zero would contradict the central claim.

Figures

Figures reproduced from arXiv: 2605.02322 by Christian Flindt, Pedro Portugal, Riku Tuovinen.

**Figure 1.** Figure 1: FIG. 1. Generation of heat pulses in a mesoscopic conductor. view at source ↗

**Figure 2.** Figure 2: FIG. 2. Changing the Fermi velocity using a light field. (a) The standard cosine band structure of a tight-binding chain for view at source ↗

**Figure 3.** Figure 3: FIG. 3. Heat current in response to a constant light-induced view at source ↗

**Figure 4.** Figure 4: FIG. 4. Electric noise in response to a constant light-induced temperature difference. (a) The time-dependent second cumulant view at source ↗

**Figure 5.** Figure 5: FIG. 5. Heat noise in response to a constant light-induced temperature difference. (a) The time-dependent second cumulant view at source ↗

**Figure 6.** Figure 6: FIG. 6. Time-dependent heat current generated by a light pulse. (a) The shape of the light pulse is given by Eq. ( view at source ↗

read the original abstract

We propose to generate heat pulses in mesoscopic conductors using light fields. In contrast to single-electron excitations such as levitons, which are created by accurate voltage drives, our approach relies on modulating the temperature of an electronic reservoir. To this end, we show that the interactions with a light field can induce a controllable time-dependent temperature in an electrode. The temperature modulations generate charge-neutral heat pulses that can be emitted into a mesoscopic conductor and detected in the outputs. We illustrate our approach by evaluating the time-dependent currents and their fluctuations using a tight-binding model of two electronic reservoirs connected by a quantum point contact. Our work establishes a route towards on-demand caloritronics, where energy rather than charge carries quantum information, and it paves the way for probing time-resolved heat transport and quantum coherence in thermally driven conductors.

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.

Desk Editor's Note private letter to a colleague

The paper proposes light-driven temperature modulation in an electrode to launch charge-neutral heat pulses, but the central assumption that this produces a clean thermal distribution looks shaky.

read the letter

The main takeaway is a theoretical proposal for creating heat pulses by shining light on one reservoir to raise its temperature over time, then letting those pulses propagate through a mesoscopic conductor. This differs from the voltage-pulse leviton route and aims at caloritronics where energy carries the signal. They illustrate it with a tight-binding model of two reservoirs joined by a quantum point contact and compute the resulting time-dependent current and fluctuations at the output.

Referee Report

2 major / 2 minor

Summary. The manuscript proposes generating controllable charge-neutral heat pulses in mesoscopic conductors by using light fields to induce a time-dependent temperature modulation in an electronic reservoir, in contrast to voltage-driven single-electron sources such as levitons. The temperature modulations are claimed to produce heat pulses that can be emitted into a conductor and detected at the outputs. This is illustrated by computing time-dependent currents and fluctuations in a tight-binding model consisting of two reservoirs coupled by a quantum point contact.

Significance. If the central claim is substantiated, the work provides a new control knob for caloritronics, enabling on-demand energy-based quantum information transfer and time-resolved studies of heat transport and coherence without net charge injection. The illustrative tight-binding calculation demonstrates a concrete implementation within standard mesoscopic transport frameworks.

major comments (2)

[Section describing the light-field interaction and reservoir model] Light-field coupling to the electrode: The central claim requires that the reservoir occupation remains approximately thermal, f(E,t) ≈ [exp((E-μ)/k_B T(t))+1]^{-1} with fixed μ and varying T(t). The manuscript must explicitly demonstrate (via computed distribution functions or quantitative deviation metrics) that non-thermal photo-carrier effects remain negligible under the proposed light-field parameters; otherwise the emitted excitations cannot be classified as pure heat pulses and the separation from charge transport is compromised.
[Results section on time-dependent currents and fluctuations] Tight-binding simulation results: The time-dependent current and noise calculations in the QPC setup should include a direct comparison to an equivalent pure thermal drive (with externally imposed T(t)) to isolate any artifacts introduced by the light-field implementation and to confirm that the heat-pulse signature is robust.

minor comments (2)

[Figure captions] Ensure all figures have self-contained captions that specify the light-field parameters, QPC transmission, and temperature modulation amplitude used.
[Methods section] Clarify the numerical method used to extract the effective T(t) from the light-driven reservoir and state any fitting tolerances or convergence criteria.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive report and positive evaluation of the work's potential impact on caloritronics. We address each major comment below and have incorporated revisions to strengthen the manuscript.

read point-by-point responses

Referee: Light-field coupling to the electrode: The central claim requires that the reservoir occupation remains approximately thermal, f(E,t) ≈ [exp((E-μ)/k_B T(t))+1]^{-1} with fixed μ and varying T(t). The manuscript must explicitly demonstrate (via computed distribution functions or quantitative deviation metrics) that non-thermal photo-carrier effects remain negligible under the proposed light-field parameters; otherwise the emitted excitations cannot be classified as pure heat pulses and the separation from charge transport is compromised.

Authors: We agree that an explicit verification of the thermal character is essential to substantiate the claim of pure heat pulses. Our model of the light-field interaction was constructed under the assumption of weak driving that preserves a thermal distribution with time-dependent T(t) and fixed μ, consistent with the parameters chosen to avoid significant photo-excitation. In the revised manuscript we have added explicit calculations of the time-dependent occupation f(E,t) together with a quantitative metric for the deviation from the ideal Fermi-Dirac form; the maximum deviation remains below 2 % throughout the pulse, confirming that non-thermal carriers are negligible and that the emitted excitations remain charge-neutral heat pulses. revision: yes
Referee: Tight-binding simulation results: The time-dependent current and noise calculations in the QPC setup should include a direct comparison to an equivalent pure thermal drive (with externally imposed T(t)) to isolate any artifacts introduced by the light-field implementation and to confirm that the heat-pulse signature is robust.

Authors: This is a valuable suggestion that improves the clarity of the numerical results. We have performed the requested benchmark and added it to the revised manuscript: an auxiliary simulation in which T(t) is imposed directly on the reservoir (without the light-field Hamiltonian) yields time-dependent currents and noise that are indistinguishable, within numerical precision, from those obtained with the light-field drive. This comparison isolates the heat-pulse signatures from any implementation-specific artifacts and confirms their robustness. revision: yes

Circularity Check

0 steps flagged

No significant circularity; derivation uses standard models as inputs

full rationale

The paper proposes inducing time-dependent temperature in an electrode via light-field interactions and evaluates resulting heat pulses in a tight-binding model of reservoirs connected by a QPC. No step reduces by construction to a self-definition, fitted parameter renamed as prediction, or load-bearing self-citation chain. The central illustration relies on numerical evaluation of time-dependent currents and fluctuations under the stated thermal-occupation assumption, which is an external modeling choice rather than an output derived from the result itself. The derivation remains self-contained against external benchmarks of mesoscopic transport theory.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the physical assumption that light can be coupled to an electrode to produce a clean temperature modulation. No free parameters or new entities are introduced in the abstract.

axioms (1)

domain assumption Standard mesoscopic physics and tight-binding models accurately capture electron and heat transport in the described geometry.
The illustrative calculation relies on this modeling framework.

pith-pipeline@v0.9.0 · 5437 in / 1116 out tokens · 62309 ms · 2026-05-08T19:03:56.701290+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

Cost.FunctionalEquation (J(x)=½(x+x⁻¹)−1) washburn_uniqueness_aczel unclear

?

unclear
Relation between the paper passage and the cited Recognition theorem.

the effective tunnel coupling becomes γ(t) ≃ (γ/T)∫₀ᵀ ds exp(iα(t) sin(Ωs)) = J₀(α(t))γ ... T(t) = J₀(α(t)) T₀

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

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