REVIEW 2 major objections 4 minor 55 references
Phase-change hysteresis and latent heat produce a radiative Mpemba effect: hotter VO2 nanoparticles cool faster than colder ones near a SiC substrate.
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
T0 review · grok-4.5
2026-07-12 12:54 UTC pith:DZBCB7XM
load-bearing objection Clean first radiative Mpemba via VO2 hysteresis; latent-heat buffer and passive external-memory variant are the real additions, with only the simplified T-FORC as a soft spot. the 2 major comments →
Hysteresis-Driven Radiative Mpemba Effect in Phase-Change Nanostructures
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
A radiative Mpemba effect—ordinary, inverse, and passive—emerges from the phase-change hysteresis of a VO2 nanoparticle coupled to a SiC substrate. Latent heat supplies a transient thermal buffer that lets an initially hotter trajectory overtake a colder one; near-field coupling both sets the intersection time and, in the passive case, stores the memory externally through the substrate’s reflection coefficients.
What carries the argument
The onset inequality obtained by expanding the cooling rate around the colder trajectory: a nonzero mismatch in metallic volume fraction or its temperature derivative must overcome the latent-heat term so that the hotter particle’s temperature derivative becomes more negative at the crossing point.
Load-bearing premise
The simplified analytic formula used for intermediate hysteresis paths after a temperature reversal must correctly capture the real kinetic delay of domain reorganization; if it does not, the predicted intersection times and the shape of the Mpemba phase space change.
What would settle it
Prepare two identical VO2 nanoparticles at the same distance from a SiC substrate, one on the heating branch and one on the cooling branch of the hysteresis loop, then record their temperature histories with pump-probe microscopy; the curves either cross with the hotter particle cooling faster or they do not.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript claims to realize a radiative analogue of the Mpemba effect (ordinary, inverse, and passive) by coupling near-field radiative heat transfer to the metal-insulator hysteresis of a VO2 nanoparticle above a SiC substrate. Starting from the heat-balance equation, it derives an analytical onset condition (Eq. 6) that requires a structural memory mismatch Δf or Δγ; maps the resulting phase space of intersection times τ via numerical trajectories; attributes the anomaly primarily to latent-heat buffering of Cp; and shows that near-field coupling both sets the relaxation timescale and enables a passive variant in which memory resides solely in the substrate reflection.
Significance. If the result holds, the work cleanly extends the Mpemba effect into radiative transport, a previously unexplored domain, and supplies a concrete, experimentally accessible platform (VO2/SiC nanoparticle-substrate geometry) together with an analytic onset criterion and three distinct manifestations. Strengths include a transparent first-order expansion of the standard heat-balance equation, exclusive use of literature optical and caloric parameters, and standard fluctuational-electrodynamics ingredients (dipole LDOS, Mie polarizabilities, Bruggeman EMA). The passive effect, in which memory is stored externally, is a conceptually novel and geometrically tunable prediction that could be tested by pump-probe microscopy. These elements make the paper a useful cornerstone for history-dependent nanoscale thermal management.
major comments (2)
- [Supplemental Material, Eq. (S14); Results, Figs. 2–3] The mapped Mpemba phase-space boundaries in Figs. 2 and 3 (and the associated statements that certain temperature pairs miss each other) are controlled by the kinetic features of the simplified analytic T-FORC model introduced in Supplemental Eq. (S14). That model is explicitly constructed to suppress steep slopes of fm immediately after thermal reversal; if real domain-reorganization kinetics differ, the topology of the heatmaps and the reported intersection times can change. A quantitative sensitivity check against a full Preisach density or an alternative kinetic model is therefore load-bearing for the central numerical claim and should be supplied (or the limitation stated more prominently).
- [Results and discussion, paragraph following Eq. (6)] The claim that the caloric channel (latent-heat peak in Cp) dominates the radiative contrast ∂P/∂fm is asserted on the basis of the gradual variation of P versus the sharp peak in ∂f/∂T, yet no quantitative decomposition of the two contributions to d(ΔT)/dt along the trajectories is given. A short supplemental plot or table separating the two terms in Eq. (5) for the representative trajectories of the insets would make this dominance statement falsifiable and strengthen the interpretation.
minor comments (4)
- [Introduction and Theory] Several concatenated words appear in the extracted text (e.g., “non-monotonictemperaturedependence,” “thephase,” “Fig.1.”). These should be corrected for readability.
- [Results, Fig. 2 inset] The distance dependence of τ is shown only for one temperature pair in the inset of Fig. 2; a brief remark on whether the far-field oscillations persist for the inverse and passive cases would improve completeness.
- [Results, Eq. (8)] The Fresnel coefficients for the thin-film passive geometry are written as “Airy-tipe”; the typographical error should be corrected to “Airy-type.”
- [References] Reference [7] is listed as an arXiv preprint with a future date stamp; the citation format should be standardized once the final version is known.
Circularity Check
No significant circularity: analytic onset condition and numerical phase-space maps are independent of any fitted or self-defined target.
full rationale
The derivation begins from the standard heat-balance ODE (Eq. 1 / S1) and expands the cooling rate ζ to first order in the structural mismatches Δf and Δγ that encode hysteresis memory, yielding the necessary inequality (Eq. 6) without any free parameters fitted to the Mpemba trajectories themselves. All material inputs (Drude-Lorentz permittivities, latent heat L, Debye Cp, outer-loop hysteresis parameters Um,Tc,ΔT) are taken from independent literature; the simplified T-FORC (S14) is an explicit modeling approximation whose kinetic details affect only the quantitative boundaries of Figs. 2-3, not the logical structure of the onset condition. Self-citations supply reusable fluctuational-electrodynamics formulas (LDOS, polarizabilities) that pre-date the Mpemba claim and are externally falsifiable; they do not close a definitional loop. Consequently the ordinary, inverse and passive effects emerge as genuine numerical consequences rather than tautologies of the inputs.
Axiom & Free-Parameter Ledger
free parameters (2)
- VO2 hysteresis driving forces and widths (Um, Ud, ΔTm, ΔTd, Tc,m, Tc,d) =
Um=233.2 K, Ud=10.1 K, ΔTm=1 K, ΔTd=0.8 K, Tc,m=342.5 K, Tc,d=334.5 K
- Latent heat L of the VO2 metal-insulator transition =
4268 J/mol
axioms (4)
- domain assumption Temperature homogenization inside the nanoparticle is much faster than radiative relaxation, so a single T(t) obeys the lumped heat-balance equation (Eq. 1 / S1).
- domain assumption The nanoparticle can be treated in the long-wavelength dipole limit with Mie polarizabilities and the planar-substrate LDOS (Eqs. S2–S10).
- ad hoc to paper Intermediate hysteresis pathways are adequately described by the simplified analytic T-FORC formula (Eq. S14) rather than a full Preisach density.
- domain assumption Bruggeman symmetric effective-medium theory with spherical inclusions yields the composite permittivity of partially transformed VO2.
invented entities (1)
-
passive radiative Mpemba effect
independent evidence
read the original abstract
The Mpemba effect states that initially hotter systems cool faster than colder ones. While known in convective, conductive, and quantum systems, its radiative analogue is unexplored. Here, this anomaly is realized via phase-change hysteresis of a VO$_2$ nanoparticle near a SiC substrate. After analytically deriving an onset condition, the phase space is mapped. Crucially, latent heat acts as a thermal buffer enabling both ordinary and inverse effects. Near-field coupling governs the relaxation time and enables a passive effect where memory is stored externally via substrate reflection.
Figures
Reference graph
Works this paper leans on
-
[1]
Mpemba and D
E. Mpemba and D. Osborne, Cool?, Phys. Educ.4, 172 (1969)
1969
-
[2]
Kumar and J
A. Kumar and J. Bechhoefer, Exponentially faster cooling in a colloidal system, Nature584, 64 (2020)
2020
-
[3]
Kumar, R
A. Kumar, R. Chétrite, and J. Bechhoefer, Anomalous heating in a colloidal system, Proc. Natl. Acad. Sci.119, e2118484119 (2022)
2022
-
[4]
Chétrite, A
R. Chétrite, A. Kumar, and J. Bechhoefer, The metastable mpemba effect corresponds to a non- monotonic temperature dependence of extractable work, Front. Phys.9, 141 (2021)
2021
-
[5]
Lasanta, F
A. Lasanta, F. V. Reyes, A. Prados, and A. Santos, When the hotter cools more quickly: Mpemba effect in granular fluids, Phys. Rev. Lett.119, 148001 (2017)
2017
-
[6]
Lu and O
Z. Lu and O. Raz, Nonequilibrium thermodynamics of the markovian mpemba effect and its inverse, Proc. Natl. Acad. Sci.114, 5083 (2017)
2017
-
[7]
Ben-Abdallah, Mpemba Effect in Many-Body Systems Near Equilibrium, arXiv , 2603.11707v3 (2026)
P. Ben-Abdallah, Mpemba Effect in Many-Body Systems Near Equilibrium, arXiv , 2603.11707v3 (2026)
Pith/arXiv arXiv 2026
-
[8]
S. A. Shapira, Y. Shapira, J. Markov, G. Teza, N. Akerman, O. Raz, and R. Ozeri, Inverse mpemba effect demonstrated on a single trapped ion qubit, Phys. Rev. Lett.133, 010403 (2024)
2024
-
[9]
F. Ares, S. Murciano, and P. Calabrese, Entanglement asymmetry as a probe of symmetry breaking, Nat. Commun.14, 2036 (2023)
2036
-
[10]
Joshi, J
L. Joshi, J. Franke, A. Rath, F. Ares, S. Murciano, F. Kranzl, R. Blatt, P. Zoller, B. Vermersch, P. Calabrese, C. Roos, and M. Joshi, Observing the quantum mpemba effect in quantum simulations, Phys. Rev. Lett.133, 010402 (2024)
2024
-
[11]
Zhang, G
J. Zhang, G. Xia, C.-W. Wu, T. Chen, Q. Zhang, Y. Xie, W.-B.Su, W.Wu, C.-W.Qiu, P.-X.Chen, W.Li, H.Jing, and Y.-L. Zhou, Observation of quantum strong mpemba effect, Nat. Commun.16, 301 (2025)
2025
-
[12]
Bechhoefer, A
J. Bechhoefer, A. Kumar, and R. Chétrite, A fresh understanding of the mpemba effect, Nat. Rev. Phys.3, 534 (2021)
2021
-
[13]
G. Teza, J. Bechhoefer, A. Lasanta, O. Raz, and M. Vucelja, Speedups in nonequilibrium thermal 5 relaxation: Mpemba and related effects, Phys. Rep. 1164, 1 (2026)
2026
-
[14]
Strachan, A
D. Strachan, A. Purkayastha, and S. Clark, Non- markovian quantum mpemba effect, Phys. Rev. Lett. 134, 22 (2025)
2025
-
[15]
Baity-Jesi, E
M. Baity-Jesi, E. Calore, A. Cruz, L. Fernandez, J. Gil- Narvión, A. Gordillo-Guerrero, D. I. niguez, A. Lasanta, A. Maiorano, E. Marinari, V. Martin-Mayor, J. Moreno- Gordo, A. Sudupe, D. Navarro, G. Parisi, S. Perez- Gaviro, F. Ricci-Tersenghi, J. Ruiz-Lorenzo, S. Schifano, B. Seoane, A. Tarancón, R. Tripiccione, and D. Yllanes, The mpemba effect in spi...
2019
-
[16]
Y. Yang, S. Basu, and L. Wang, Radiation-based near-field thermal rectification with phase transition materials, Appl. Phys. Lett.103, 163101 (2013)
2013
-
[17]
Ben-Abdallah and S.-A
P. Ben-Abdallah and S.-A. Biehs, Phase-change radiative thermal diode, Appl. Phys. Lett.103, 191907 (2013)
2013
-
[18]
Ben-Abdallah and S.-A
P. Ben-Abdallah and S.-A. Biehs, Near-field thermal transistor, Phys. Rev. Lett.112, 044301 (2014)
2014
-
[19]
Joulain, Y
K. Joulain, Y. Ezzahri, J. Drevillon, and P. Ben- Abdallah, Modulation and amplification of radiative far field heat transfer: Towards a simple radiative thermal transistor, Appl. Phys. Lett.106, 133505 (2015)
2015
-
[20]
Biehs and P
S.-A. Biehs and P. Ben-Abdallah, Towards boolean operations with thermal photons, Phys. Rev. B94, 241401(R) (2016)
2016
-
[21]
Kathmann, M
C. Kathmann, M. Reina, R. Messina, P. Ben-Abdallah, and S.-A. Biehs, Scalable radiative thermal logic gates based on nanoparticle networks, Sci. Rep.10, 3596 (2020)
2020
-
[22]
Kubytskyi, S.-A
V. Kubytskyi, S.-A. Biehs, and P. Ben-Abdallah, Radiative bistability and thermal memory, Phys. Rev. Lett.113, 074301 (2014)
2014
-
[23]
Dyakov, J
S. Dyakov, J. Dai, M. Yan, and M. Qiu, Near field thermal memory based on radiative phase bistability of vo2, J. Phys. D: Appl. Phys.48, 305104 (2015)
2015
-
[24]
van Zwol, K
P. van Zwol, K. Joulain, P. Ben-Abdallah, and J. Chevrier, Phonon polaritons enhance near-field thermal transfer across the phase transition of vo2, Phys. Rev. B84, 161413(R) (2011)
2011
-
[26]
Narayanaswamy, A model of structural relaxation in glass, J
O. Narayanaswamy, A model of structural relaxation in glass, J. Am. Ceram. Soc.54, 491 (1971)
1971
-
[27]
L. Song, M. Gao, W. Xu, J. Huo, and J.-Q. Wang, Mpembalike abnormal aging kinetics of glasses derived fromβrelaxation, Phys. Rev. Lett.136, 207102 (2026)
2026
-
[28]
Zhang, B
K. Zhang, B. Zhang, J. Song, Z. Luo, and Q. Cheng, Modulation of near-field radiative heat transfer between nanoparticles supported by a strained hbn film with graphene covered, Int. J. Therm. Sci.198, 108809 (2024)
2024
-
[29]
Qazilbash, M
M. Qazilbash, M. Brehm, G. Andreev, A. Frenzel, P.- C. Ho, B.-G. Chae, B.-J. Kim, S. Yun, H.-T. Kim, A. Balatsky, O. Shpyrko, M. Maple, F. Keilmann, and D. Basov, Minfrared spectroscopy and nano-imaging of the insulator-to-metal transition in vanadium dioxide, Phys. Rev. B79, 075107 (2009)
2009
-
[30]
Chew, Waves and Fields in Inhomogenous Media (Wiley-IEEE Press, 1995) Chap
W. Chew, Waves and Fields in Inhomogenous Media (Wiley-IEEE Press, 1995) Chap. 7
1995
-
[31]
Wagner, Z
M. Wagner, Z. Fei, A. McLeod, A. Rodin, W. Bao, E. Iwinski, Z. Zhao, M. Goldflam, M. Liu, G. Dominguez, M. Thiemens, M. Fogler, A. C. Neto, C. Lau, S. Amarie, F. Keilmann, and D. Basov, Ultrafast and nanoscale plasmonic phenomena in exfoliated graphene revealed by infrared pump-probe nanoscopy, Nano Lett.14, 894 (2014)
2014
-
[32]
Dönges, O
S. Dönges, O. Khatib, B. O’Callahan, J. Atkin, J. Park, D. Cobden, and M. Raschke, Ultrafast nanoimaging of the photoinduced phase transition dynamics in vo2, Nano Lett.16, 3029 (2016)
2016
-
[33]
Jin and S
P. Jin and S. Tanemura, Relationship between transition temperature and x in v1−xwxo2 films deposited by dual- target magnetron sputtering, Jpn. J. Appl. Phys.34, 2459 (1995)
1995
-
[34]
X. Tan, T. Yao, R. Long, Z. Sun, Y. Feng, H. Cheng, X. Yuan, W. Zhang, Q. Liu, C. Wu, Y. Xie, and S. Wei, Unraveling metal-insulator transition mechanism of vo2 triggered by tungsten doping, Jpn. J. Appl. Phys.2, 466 (2012). Supplemental Material: Hysteresis-Driven Radiative Mpemba Effect in Phase-Change Nanostructures F. Herz Institut für Physik, Carl vo...
2012
-
[35]
Tschikin, S.-A
M. Tschikin, S.-A. Biehs, F. Rosa, and P. Ben-Abdallah, Radiative cooling of nanoparticles close to a surface, Eur. Phys. J. B85, 233 (2012)
2012
-
[36]
Tai,Dyadic Green’s Functions in Electromagnetic Theory (Intext Educational Publishers, Scranton, 1971)
C.-T. Tai,Dyadic Green’s Functions in Electromagnetic Theory (Intext Educational Publishers, Scranton, 1971)
1971
-
[37]
Sipe, New Green-function formalism for surface optics, J
J. Sipe, New Green-function formalism for surface optics, J. Opt. Soc. Am. B4, 481 (1987)
1987
-
[38]
Mulet, K
J.-P. Mulet, K. Joulain, R. Carminati, and J.-J. Greffet, Nanoscale radiative heat transfer between a small particle and a plane surface, Appl. Phys. Lett.78, 2931 (2001)
2001
-
[39]
Rousseau, A
E. Rousseau, A. Siria, G. Jourdan, S. Volz, F. Comin, J. Chevrier, and J.-J. Greffet, Radiative heat transfer at the nanoscale, Nat. Photonics3, 514 (2009)
2009
-
[40]
O. Huth, F. Rüting, S.-A. Biehs, and M. Holthaus, Shape-dependence of near-field heat transfer between a spheroidal nanoparticle and a flat surface, Eur. Phys. J. Appl. Phys.50, 10603 (2010)
2010
-
[41]
Kallel, R
H. Kallel, R. Carminati, and K. Joulain, Temperature of a nanoparticle above a substrate under radiative heating and cooling, Phys. Rev. B95, 115402 (2017)
2017
-
[42]
F. Herz, Z. An, S. Komiyama, and S.-A. Biehs, Revisiting the dipole model for a thermal infrared near-field spectroscope, Phys. Rev. Appl.10, 044051 (2018)
2018
-
[43]
Herz and S.-A
F. Herz and S.-A. Biehs, Dipole model for far-field thermal emission of a nanoparticle above a planar substrate, J. Quant. Spectrosc. Radiat. Transf.266, 107572 (2021)
2021
-
[44]
Herz and S.-A
F. Herz and S.-A. Biehs, Generalized coupled dipole method for thermal far-field radiation, Phys. Rev. B105, 205422 (2022)
2022
-
[45]
C. F. Bohren and D. R. Huffman,Absorption and Scattering of Light by Small Particles (1983)
1983
-
[46]
Barker, H
A. Barker, H. Verleur, and H. Guggenheim, Infrared Optical Properties of Vanadium Dioxide Above and Below the Transition Temperature, Phys. Rev. Lett.17, 1286 (1966)
1966
-
[47]
Goodenough, The two components of the crystallographic transition in vo2, J
J. Goodenough, The two components of the crystallographic transition in vo2, J. Solid State Chem.3, 490 (1971)
1971
-
[48]
H. Choi, J. Ahn, J. Jung, T. Noh, and D. Kim, Mid-infrared properties of a vo2 film near the metal-insulator transition, Phys. Rev. B54, 4621 (1996)
1996
-
[49]
Jepsen, B
P. Jepsen, B. Fischer, A. Thoman, H. Helm, J. Suh, R. Lopez, and R. Haglund, Metal-insulator phase transition in a vo2 thin film observed with terahertz spectroscopy, Phys. Rev. B74, 205103 (2006)
2006
-
[50]
Mayergoyz,Mathematical Models of Hysteresis and Their Applications (Academic Press, 2003)
I. Mayergoyz,Mathematical Models of Hysteresis and Their Applications (Academic Press, 2003)
2003
-
[51]
Tanasa, C
R. Tanasa, C. Enachescu, A. Stancu, J. Linares, E. Codjovi, F. Varret, and J. Haasnoot, First-order reversal curve analysis of spin-transition thermal hysteresis in terms of physical-parameter distributions and their correlations, Phys. Rev. B71, 014431 (2005)
2005
-
[52]
Ordonez-Miranda, Y
J. Ordonez-Miranda, Y. Ezzahri, K. Joulain, J. Drevillon, and J. Alvarado-Gil, Modeling of the electrical conductivity, thermal conductivity, and specific heat capacity of vo2, Phys. Rev. B98, 075144 (2018)
2018
-
[53]
Chandrashekhar, H
G. Chandrashekhar, H. Barros, and J. Honig, Heat capacity of vo2 single crystals, Mater. Res. Bull.8, 369 (1973)
1973
-
[54]
Kawakubo and T
T. Kawakubo and T. Nakagawa, Phase transition in vo2, J. Phys. Soc. Jpn.19, 517 (1964)
1964
-
[55]
Zhong, X
X. Zhong, X. Zhang, A. Gupta, and P. LeClair, Avalanche breakdown in microscale vo2 structures, J. Appl. Phys.110, 084516 (2011)
2011
-
[56]
Berglund and H
C. Berglund and H. J. Guggenheim, Electronic Properties of VO2 near the Semiconductor-Metal Transition, Phys. Rev. 185, 1022 (1969)
1969
discussion (0)
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