REVIEW 3 major objections 3 minor 1 cited by
Control of magnetic transition, metal-semiconductor transition, and magnetic anisotropy in noncentrosymmetric monolayer Cr$_2$Ge$_2$Se$_3$Te$_3$
T0 review · 3 major / 3 minor · reviewed 2026-08-05 · deepseek-v4-flash
Pith's one-line read The paper claims that noncentrosymmetric Janus Cr2Ge2Se3Te3 is a ferromagnet whose magnetic order, electronic character, and easy axis are switchable by strain, with electric-field tunable magnetocrystalline anisotropy.
desk verdict Manuscript body is an unrelated astronomy paper; the claimed DFT study of Cr2Ge2Se3Te3 is entirely absent, so the abstract's results have no support. read the letter →
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
What carries the argument
The central object is the Janus structure of Cr2Ge2Se3Te3, formed by making the two faces of the layer chemically different (Se on one side, Te on the other), which removes inversion symmetry while keeping the layer two-dimensional. The argument is carried by two computed quantities: the energy difference between ferromagnetic and antiferromagnetic spin arrangements as a function of strain, which sets the magnetic ground state, and the magnetocrystalline anisotropy energy (MAE), obtained from spin-orbit coupling, which sets the easy axis. The MAE is further decomposed by orbital channels, and the p orbitals of the Te3 atoms are the decisive term in the paper's explanation of how strain and e
What would settle it
Run a first-principles calculation on the Cr2Ge2Se3Te3 monolayer and compare total energies of ferromagnetic and antiferromagnetic ordering across the stated strain range, along with the magnetocrystalline anisotropy energy and its easy-axis direction. The central claim would be settled by whether the ferromagnetic ground state, the magnetic transition, the metal-semiconductor crossing, and the in-plane-to-out-of-plane anisotropy switch all reproduce; no such results are present in this document.
Extended reading notes
Core claim
On the paper's own terms, the discovery is that replacing one Te layer of Cr2Ge2Te6 with Se produces a Janus ferromagnetic monolayer, Cr2Ge2Se3Te3, that breaks inversion symmetry and remains magnetically ordered. Under different applied strains the same monolayer is said to transform between ferromagnetic and antiferromagnetic ground states and between metallic and semiconducting electronic states; the magnetocrystalline anisotropy energy is modulated by both electric field and strain, and strain can flip the easy axis from in-plane to out-of-plane. The Te3 sites are identified as the dominant source of the anisotropy, with the largest contributions coming from $p_z/p_y$ and $p_x/p_y$ orbita
Load-bearing premise
The load-bearing premise is that the attached text is the paper described in the abstract; the abstract's claims about Cr2Ge2Se3Te3 rest entirely on first-principles calculations that do not appear anywhere in the supplied body, so if those calculations are missing the central claim has no evidentiary support.
Editorial extensions
If this is right
- A single monolayer of Cr2Ge2Se3Te3 would let strain choose between ferromagnetic and antiferromagnetic order, so a mechanical handle could replace magnetic-field switching in a two-dimensional device.
- The same strain range would also cross a metal-semiconductor transition, coupling the magnetic order parameter to the electronic transport in one material.
- Electric field and strain both tune the magnetocrystalline anisotropy energy, giving electrostatic control over the magnetization direction.
- Rotating the easy axis from in-plane to out-of-plane under strain makes the monolayer a candidate for voltage- or stress-controlled magnetic memory bits.
- Identifying Te3 p orbitals as the anisotropy source offers a concrete substitution site for alloying or chemical design of stronger or differently oriented anisotropy.
Reading between the lines
- A reader cannot test these claims from this record: the attached text supplies none of the density-functional-theory data, so the first step is to recover or reproduce the original calculations.
- If the strain-driven ferromagnetic-antiferromagnetic and metal-semiconductor transitions survive more rigorous treatment, the same Janus design could generalize to other members of the Cr2Ge2Te6 family.
- The claimed in-plane to out-of-plane easy-axis switch is a sharp signature that could be checked experimentally in exfoliated or grown flakes by measuring anisotropic magnetoresistance or using torque magnetometry as a function of strain, although no such measurement is reported here.
Signed reviews
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The abstract announces first-principles predictions for a noncentrosymmetric Janus monolayer Cr2Ge2Se3Te3: strain-driven ferromagnetic-antiferromagnetic and metal-semiconductor transitions, electric-field/strain-tunable magnetocrystalline anisotropy, and an in-plane-to-out-of-plane easy-axis switch, attributed mainly to Te3 orbitals. The full text supplied with the submission is, however, an unrelated observational astronomy paper, 'BSN-II: The First Light Curve Study of Eight Total Eclipsing Contact Binary Stars with Shallow Fillout Factors.' That body contains no DFT method, no structural model of Cr2Ge2Se3Te3, no strain or electric-field ranges, no band structures, no MAE values, no orbital-resolved analysis, and no discussion of the claimed material in any section, equation, table, or figure. The central claims therefore have no in-text derivation or evidentiary support.
Significance. If substantiated, the abstract's claims would be of genuine interest to the 2D magnetism and spintronics communities, since noncentrosymmetric Janus ferromagnets with strain-tunable magnetic order and anisotropy are actively sought. However, as submitted the manuscript contains none of the promised calculations. There are no reproducible code, machine-checked proofs, parameter-free derivations, or falsifiable predictions for Cr2Ge2Se3Te3 that can be assessed. The submitted text is an astronomy paper with a different title, abstract, authors, and subject matter. Consequently, the paper's significance cannot be evaluated beyond the abstract, and the abstract itself is unsupported by the body.
major comments (3)
- [Abstract vs. Full Text] The abstract reports first-principles calculations for monolayer Cr2Ge2Se3Te3, but the manuscript body is an astronomy paper on eight contact binary systems. No section, equation, table, or figure in the body pertains to Cr2Ge2Se3Te3, DFT, strain, electric fields, magnetic transitions, or MAE. The central claims — FM-AFM transition, metal-semiconductor transition, MAE modulation, and easy-axis switching — have zero in-text derivation. This is a load-bearing structural failure, not a missing detail.
- [Sections 2–5 (body)] The body's methods and results are entirely photometric: observations, O-C analysis, PHOEBE light-curve fits, and Gaia-based absolute parameters. There is no computational setup for the claimed material — no exchange-correlation functional, pseudopotential, cutoff energy, k-mesh, van der Waals treatment, or convergence criteria — and no results such as band structures, density of states, magnetic moments, or MAE curves. The claimed findings cannot be reproduced, checked, or even located in the manuscript.
- [Internal consistency] The title and abstract of the submission are inconsistent with the body's own abstract, keywords, and content. This is not a divergence from consensus or a subtle interpretive issue; it is a complete mismatch between the paper's stated claims and its evidentiary text. As a result, the referee cannot assess soundness beyond noting the absence of support for every substantive claim, including the specific orbital decomposition of MAE attributed to Te3 p_z/p_y and p_x/p_y states.
minor comments (3)
- [Structure] The manuscript has no conclusions section for the DFT study. The body ends with acknowledgments and references belonging to the astronomy paper, leaving the abstract's claims completely unclosed.
- [Title/Abstract mismatch] The submission's title and abstract should match the body. As written, the paper reads as an astronomy preprint (apparently arXiv:2508.11901) mistakenly paired with a condensed-matter abstract.
- [Self-containment] Even the abstract's qualifying statement that 'Te3 atoms play a key role' is not supported by any figure or table in the body. A reader should be able to trace each claimed result to a specific numerical or graphical result; none exists here.
Circularity Check
No circularity found: the manuscript body contains no DFT derivation for Cr2Ge2Se3Te3, so there is no reduction chain to audit.
full rationale
The supplied full text is an unrelated astronomy paper, 'BSN-II: The First Light Curve Study of Eight Total Eclipsing Contact Binary Stars with Shallow Fillout Factors.' It contains no first-principles methodology, no structural model of Cr2Ge2Se3Te3, no strain or electric-field ranges, no band structures, and no magnetocrystalline anisotropy energy values. The abstract's claims about strain-driven magnetic transitions and MAE tuning are therefore unsupported by the manuscript body. However, circularity requires demonstrating that a claimed prediction reduces by construction to its own inputs or to a self-citation chain. Here, there is no derivation chain at all to reduce; the problem is an absence of evidence, not circularity. Under the hard rules, circularity may only be flagged when a specific reduction can be quoted from the paper. None exists, so the appropriate circularity score is 0.
Assumptions & free parameters
assumptions (2)
- domain assumption DFT with an appropriate functional reliably predicts magnetic ground states, band gaps, and MAE of 2D magnets.
- domain assumption The abstract's monolayer Cr2Ge2Se3Te3 is a structurally stable Janus layer accessible in calculations.
invented entities (1)
-
Monolayer Cr2Ge2Se3Te3 Janus ferromagnet
Cite this review
Pith. "Pith review of Control of magnetic transition, metal-semiconductor transition, and magnetic anisotropy in noncentrosymmetric monolayer Cr$_2$Ge$_2$Se$_3$Te$_3$." pith.science (2026). https://pith.science/paper/HLOOFYN2
@misc{pith2026250811899,
author = {Pith},
title = {Pith review of: Control of magnetic transition, metal-semiconductor transition, and magnetic anisotropy in noncentrosymmetric monolayer Cr$_2$Ge$_2$Se$_3$Te$_3$},
year = {2026},
howpublished = {\url{https://pith.science/paper/HLOOFYN2}},
note = {Machine review of arXiv:2508.11899}
}
abstract
Recent advances in two-dimensional materials have greatly expanded the family of ferromagnetic materials. The well-known 2D ferromagnets, such as CrI$_3$, Cr$_2$Ge$_2$Te$_6$, and Fe$_3$GeTe$_2$ monolayers, are characterized by centrosymmetric crystal structures. In contrast, ferromagnetic ordering in 2D noncentrosymmetric materials remains an underexplored area. Here we report a Janus ferromagnet, Cr$_2$Ge$_2$Se$_3$Te$_3$ with inversion symmetry breaking, through first-principles calculations. This monolayer can undergo a ferromagnetic-antiferromagnetic transformation and a metal-semiconductor transition under different strains. Additionally, the strength of magnetocrystalline anisotropy energy (MAE) can be modulated by electric field or strain. In particular, the magnetization easy axis can be altered from in-plane to out-of-plane under strain. We find that Te$_3$ atoms play a key role in determining the MAE, where contributions are primarily from $p_z / p_y$ and $p_x / p_y$ orbitals. This study of Janus ferromagnetic materials has provided a promising platform for the research on the control of magnetism by strain or electric field.
Forward citations
Cited by 1 Pith paper
-
OmniD: Generalizable Robot Manipulation Policy via Image-Based BEV Representation
A multi-camera robot policy that builds a bird's-eye-view representation with deformable attention reportedly improves in-distribution, out-of-distribution, and few-shot manipulation performance by 11%, 17%, and 84% o...
Reference graph
Works this paper leans on
-
[1]
2000, AJ, 119, 1901, doi: 10.1086/301321
Akerlof, C., Amrose, S., Balsano, R., et al. 2000, AJ, 119, 1901, doi: 10.1086/301321
-
[2]
Bellm, E. C., Kulkarni, S. R., Barlow, T., et al. 2019, PASP, 131, 068003, doi: 10.1088/1538-3873/ab0c2a
-
[3]
1970, Vistas in Astronomy, 12, 217, doi: 10.1016/0083-6656(70)90041-3
Binnendijk, L. 1970, Vistas in Astronomy, 12, 217, doi: 10.1016/0083-6656(70)90041-3
-
[4]
Butters, O. W., West, R. G., Anderson, D. R., et al. 2010, A&A, 520, L10, doi: 10.1051/0004-6361/201015655
-
[5]
Castelli, F., & Kurucz, R. L. 2004, A&A, 419, 725, doi: 10.1051/0004-6361:20040079
-
[6]
2018, ApJS, 237, 28, doi: 10.3847/1538-4365/aad32b
Chen, X., Wang, S., Deng, L., de Grijs, R., & Yang, M. 2018, ApJS, 237, 28, doi: 10.3847/1538-4365/aad32b
-
[7]
2020, ApJS, 249, 18, doi: 10.3847/1538-4365/ab9cae
Chen, X., Wang, S., Deng, L., et al. 2020, ApJS, 249, 18, doi: 10.3847/1538-4365/ab9cae
-
[8]
E., Kochoska, A., Hey, D., et al
Conroy, K. E., Kochoska, A., Hey, D., et al. 2020, ApJS, 250, 34, doi: 10.3847/1538-4365/abb4e2
Show all 55 references
-
[9]
Cox, A. N. 2000, Allen’s astrophysical quantities (New York: AIP Press; Springer)
2000
-
[10]
J., Graham, M
Drake, A. J., Graham, M. J., Djorgovski, S. G., et al. 2014, ApJS, 213, 9, doi: 10.1088/0067-0049/213/1/9
2014 doi
-
[11]
Eastman, J., Siverd, R., & Gaudi, B. S. 2010, PASP, 122, 935, doi: 10.1086/655938
2010 doi
-
[12]
2006, MNRAS, 373, 1483, doi: 10.1111/j.1365-2966.2006.11073.x
Eker, Z., Demircan, O., Bilir, S., & Karata¸ s, Y. 2006, MNRAS, 373, 1483, doi: 10.1111/j.1365-2966.2006.11073.x
2006
-
[13]
2018, MNRAS, 479, 5491, doi: 10.1093/mnras/sty1834
Eker, Z., Bakı¸ s, V., Bilir, S., et al. 2018, MNRAS, 479, 5491, doi: 10.1093/mnras/sty1834
2018 doi
-
[14]
Flower, P. J. 1996, ApJ, 469, 355, doi: 10.1086/177785 Gaia Collaboration, Montegriffo, P., Bellazzini, M., et al. 2023, A&A, 674, A33, doi: 10.1051/0004-6361/202243709
1996 doi
-
[15]
J., Geske, M
Gettel, S. J., Geske, M. T., & McKay, T. A. 2006, AJ, 131, 621, doi: 10.1086/498016
2006 doi
-
[16]
2000, A&AS, 141, 371, doi: 10.1051/aas:2000126
Girardi, L., Bressan, A., Bertelli, G., & Chiosi, C. 2000, A&AS, 141, 371, doi: 10.1051/aas:2000126
2000 doi
-
[17]
2019, ApJ, 887, 93, doi: 10.3847/1538-4357/ab5362
Finkbeiner, D. 2019, ApJ, 887, 93, doi: 10.3847/1538-4357/ab5362
2019 doi
-
[18]
W., King, D
Hilditch, R. W., King, D. J., & McFarlane, T. M. 1989, MNRAS, 237, 447, doi: 10.1093/mnras/237.2.447
1989 doi
-
[19]
I., Harrison, T
Hoffman, D. I., Harrison, T. E., & McNamara, B. J. 2009, AJ, 138, 466, doi: 10.1088/0004-6256/138/2/466
2009 doi
-
[20]
S., Stanek, K
Jayasinghe, T., Kochanek, C. S., Stanek, K. Z., et al. 2018a, MNRAS, 477, 3145, doi: 10.1093/mnras/sty838 —. 2018b, MNRAS, 477, 3145, doi: 10.1093/mnras/sty838
-
[21]
2012, MNRAS, 421, 2769, doi: 10.1111/j.1365-2966.2011.20323.x
Jiang, D., Han, Z., Ge, H., Yang, L., & Li, L. 2012, MNRAS, 421, 2769, doi: 10.1111/j.1365-2966.2011.20323.x
2012
-
[22]
Kuiper, G. P. 1941, Astrophysical Journal, vol. 93, p. 133, 93, 133
1941
-
[23]
Kwee, K. K. 1958, BAN, 14, 131
1958
-
[24]
K., & van Woerden, H
Kwee, K. K., & van Woerden, H. 1956, BAN, 12, 327
1956
-
[25]
2022, AJ, 164, 202, doi: 10.3847/1538-3881/ac8ff2
Li, K., Gao, X., Liu, X.-Y., et al. 2022, AJ, 164, 202, doi: 10.3847/1538-3881/ac8ff2
2022 doi
-
[26]
2020, The Astronomical Journal, 159, 189, doi: 10.3847/1538-3881/ab7cda
Li, K., Kim, C.-H., Xia, Q.-Q., et al. 2020, The Astronomical Journal, 159, 189, doi: 10.3847/1538-3881/ab7cda
2020 doi
-
[27]
Li, K., & Qian, S. B. 2013, NewA, 21, 46, doi: 10.1016/j.newast.2012.11.003
2013 doi
-
[28]
2021, AJ, 162, 13, doi: 10.3847/1538-3881/abfc53
Li, K., Xia, Q.-Q., Kim, C.-H., et al. 2021, AJ, 162, 13, doi: 10.3847/1538-3881/abfc53
2021 doi
-
[29]
2008, MNRAS, 387, 97, doi: 10.1111/j.1365-2966.2008.12736.x
Li, L., Zhang, F., Han, Z., Jiang, D., & Jiang, T. 2008, MNRAS, 387, 97, doi: 10.1111/j.1365-2966.2008.12736.x
2008
-
[30]
2003, ChJA&A, 3, 142, doi: 10.1088/1009-9271/3/2/142
Liu, Q.-Y., & Yang, Y.-L. 2003, ChJA&A, 3, 142, doi: 10.1088/1009-9271/3/2/142
2003 doi
-
[31]
Lucy, L. B. 1967, ZA, 65, 89 —. 1968a, ApJ, 151, 1123, doi: 10.1086/149510 —. 1968b, ApJ, 153, 877, doi: 10.1086/149712
1967 doi
-
[32]
J., Laher, R
Masci, F. J., Laher, R. R., Rusholme, B., et al. 2019, PASP, 131, 018003, doi: 10.1088/1538-3873/aae8ac
2019 doi
-
[33]
Mochnacki, S. W. 1981, The Astrophysical Journal, 245, 650, doi: 10.1086/158845
1981 doi
-
[34]
A., & Mead, R
Nelder, J. A., & Mead, R. 1965, The computer journal, 7, 308 16 O’Connell, D. J. K. 1951, Publications of the Riverview College Observatory, 2, 85
1965
-
[35]
Paki, E., Poro, A., & Moosavi Rowzati, M. D. 2025, Galaxies, 13, 74, doi: 10.3390/galaxies13040074
2025 doi
-
[36]
2013, AJ, 146, 101, doi: 10.1088/0004-6256/146/4/101
Palaversa, L., Ivezi´ c,ˇZ., Eyer, L., et al. 2013, AJ, 146, 101, doi: 10.1088/0004-6256/146/4/101
2013 doi
-
[37]
2024a, PASP, 136, 024201, doi: 10.1088/1538-3873/ad1ed3
Poro, A., Tanriver, M., Michel, R., & Paki, E. 2024a, PASP, 136, 024201, doi: 10.1088/1538-3873/ad1ed3
-
[38]
2024b, AJ, 168, 272, doi: 10.3847/1538-3881/ad8345
Poro, A., Li, K., Michel, R., et al. 2024b, AJ, 168, 272, doi: 10.3847/1538-3881/ad8345
-
[39]
2024c, NewA, 110, 102227, doi: 10.1016/j.newast.2024.102227
Poro, A., Hedayatjoo, M., Nastaran, M., et al. 2024c, NewA, 110, 102227, doi: 10.1016/j.newast.2024.102227
2024
-
[40]
2025, MNRAS, 537, 3160, doi: 10.1093/mnras/staf222 Prˇ sa, A., Conroy, K
Poro, A., Li, K., Paki, E., et al. 2025, MNRAS, 537, 3160, doi: 10.1093/mnras/staf222 Prˇ sa, A., Conroy, K. E., Horvat, M., et al. 2016, ApJS, 227, 29, doi: 10.3847/1538-4365/227/2/29
2025 doi
-
[41]
2020, Research in Astronomy and Astrophysics, 20, 163, doi: 10.1088/1674-4527/20/10/163
Qian, S.-B., Zhu, L.-Y., Liu, L., et al. 2020, Research in Astronomy and Astrophysics, 20, 163, doi: 10.1088/1674-4527/20/10/163
2020 doi
-
[42]
B., Liu, N
Qian, S. B., Liu, N. P., Li, K., et al. 2013, ApJS, 209, 13, doi: 10.1088/0067-0049/209/1/13
2013 doi
-
[43]
B., Wang, J
Qian, S. B., Wang, J. J., Zhu, L. Y., et al. 2014, ApJS, 212, 4, doi: 10.1088/0067-0049/212/1/4
2014 doi
-
[44]
R., Winn, J
Ricker, G. R., Winn, J. N., Vanderspek, R., et al. 2015, Journal of Astronomical Telescopes, Instruments, and Systems, 1, 014003, doi: 10.1117/1.JATIS.1.1.014003 Ruci´ nski, S. M. 1969, AcA, 19, 245 S´ anchez-S´ aez, P., Arredondo, J., Bayo, A., et al. 2023, A&A, 675, A195, do...
2015 doi
-
[45]
J., Prieto, J
Shappee, B. J., Prieto, J. L., Grupe, D., et al. 2014, ApJ, 788, 48, doi: 10.1088/0004-637X/788/1/48
2014 doi
-
[46]
2024, NewA, 105, 102112, doi: 10.1016/j.newast.2023.102112
Soomandar, S., & Poro, A. 2024, NewA, 105, 102112, doi: 10.1016/j.newast.2023.102112
2024
-
[47]
S., & Vivekananda Rao, P
Sriram, K., Malu, S., Choi, C. S., & Vivekananda Rao, P. 2017, AJ, 153, 231, doi: 10.3847/1538-3881/aa6893
2017 doi
- [48]
-
[49]
Terrell, D., & Wilson, R. E. 2005, Ap&SS, 296, 221, doi: 10.1007/s10509-005-4449-4
2005 doi
-
[50]
1986, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, Vol
Tody, D. 1986, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, Vol. 627, Instrumentation in astronomy VI, ed. D. L. Crawford, 733, doi: 10.1117/12.968154
1986 doi
-
[51]
2010, AJ, 140, 1158, doi: 10.1088/0004-6256/140/5/1158
Torres, G. 2010, AJ, 140, 1158, doi: 10.1088/0004-6256/140/5/1158
2010 doi
-
[52]
V., Dremova, G
Tutukov, A. V., Dremova, G. N., & Svechnikov, M. A. 2004, Astronomy Reports, 48, 219, doi: 10.1134/1.1687015
2004 doi
-
[53]
Yakut, K., & Eggleton, P. P. 2005, ApJ, 629, 1055, doi: 10.1086/431300
2005 doi
-
[54]
2013, MNRAS, 430, 2029, doi: 10.1093/mnras/stt028
Yildiz, M., & Do˘ gan, T. 2013, MNRAS, 430, 2029, doi: 10.1093/mnras/stt028
2013 doi
-
[55]
2020, MNRAS, 492, 4112, doi: 10.1093/mnras/staa079
Zhang, X.-D., Qian, S.-B., & Liao, W.-P. 2020, MNRAS, 492, 4112, doi: 10.1093/mnras/staa079
2020 doi
Reviewed August 5, 2026 · model on record in the stance chip above.
Discussion (0). Continue with ORCID to comment.