pith. sign in

arxiv: 2606.23528 · v1 · pith:7DDDLULKnew · submitted 2026-06-22 · ❄️ cond-mat.quant-gas · physics.atom-ph

A dipolar Bose-Bose mixture of Dysprosium isotopes with controllable interspecies interactions

M. Duerbeck , L. Reihs , J.P. Marulanda-Serna , B. Choudhari , J. Seifert , N. Werum , G. Meijer , G. Valtolina This is my paper

Pith reviewed 2026-06-26 05:56 UTC · model grok-4.3

classification ❄️ cond-mat.quant-gas physics.atom-ph
keywords dysprosiumbose-einstein condensatefeshbach resonancedipolar gasmiscible-immiscible transitionultracold mixturequantum degenerate gas
0
0 comments X

The pith

A mixture of two dysprosium Bose-Einstein condensates is tuned between miscible and immiscible phases via a broad interspecies Feshbach resonance.

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

The authors create a quantum-degenerate Bose-Bose mixture of the isotopes 162Dy and 164Dy. The near-identical masses and polarizabilities of the two species allow the mixture to thermalize and evaporate efficiently, with trajectories that closely match single-species cases. A broad interspecies Feshbach resonance is then used to vary the interaction strength and drive a transition from miscible to immiscible behavior between the two condensates. The platform combines this tunability with the large magnetic dipole moment of dysprosium, positioning it for studies of dipolar physics in multicomponent systems.

Core claim

We report on the realization of a quantum-degenerate Bose-Bose mixture of 162Dy and 164Dy. Owing to the near-identical mass and polarizability of the two isotopes, the mixture thermalizes efficiently, with evaporation trajectories closely following those of the single-isotope case. Using a broad interspecies Feshbach resonance, we explore a miscible-immiscible transition between the two Bose-Einstein condensates. The tunability of the interspecies interaction, combined with the large magnetic dipole moment of Dy, makes this platform well suited for exploring dipolar effects in ultracold mixtures, including multi-component supersolidity.

What carries the argument

Broad interspecies Feshbach resonance that tunes the scattering length between the two dysprosium isotopes while both species remain quantum degenerate.

If this is right

  • The mixture remains stable and quantum degenerate while the interspecies interaction is tuned across the miscible-immiscible boundary.
  • The large magnetic dipole moments of both species remain available for dipolar physics once the contact interaction is adjusted.
  • The same evaporation sequence used for single-species dysprosium works for the mixture without additional optimization.

Where Pith is reading between the lines

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

  • Independent tuning of intra-species and inter-species dipolar strengths could become possible by combining the Feshbach resonance with magnetic-field orientation control.
  • Phase-separation dynamics near the transition could be studied with high spatial resolution to test predictions for dipolar binary condensates.
  • Extension to three-component mixtures or to mixtures with different dysprosium isotopes might reveal additional supersolid phases.

Load-bearing premise

The two isotopes have sufficiently similar mass and polarizability that the mixture thermalizes efficiently and follows single-species evaporation trajectories.

What would settle it

No observable change in spatial overlap or density profiles between the two condensates when the magnetic field is swept across the reported interspecies Feshbach resonance.

Figures

Figures reproduced from arXiv: 2606.23528 by B. Choudhari, G. Meijer, G. Valtolina, J.P. Marulanda-Serna, J. Seifert, L. Reihs, M. Duerbeck, N. Werum.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) Absorption images of [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. Evaporative cooling trajectories for single-species and dual-species operation at a magnetic [PITH_FULL_IMAGE:figures/full_fig_p006_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. Interspecies Feshbach resonances between [PITH_FULL_IMAGE:figures/full_fig_p007_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. Evidence of miscible-immiscible transition in a Dy miture. (a) Relative vertical displace [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
read the original abstract

We report on the realization of a quantum-degenerate Bose-Bose mixture of 162Dy and 164Dy. Owing to the near-identical mass and polarizability of the two isotopes, the mixture thermalizes efficiently, with evaporation trajectories closely following those of the single-isotope case. Using a broad interspecies Feshbach resonance, we explore a miscible-immiscible transition between the two Bose-Einstein condensates. The tunability of the interspecies interaction, combined with the large magnetic dipole moment of Dy, makes this platform well suited for exploring dipolar effects in ultracold mixtures, including multi-component supersolidity.

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

0 major / 2 minor

Summary. The manuscript reports the experimental realization of a quantum-degenerate Bose-Bose mixture of 162Dy and 164Dy. Owing to the near-identical mass and polarizability of the isotopes, the mixture thermalizes efficiently during evaporation. A broad interspecies Feshbach resonance is used to tune the interspecies interaction and observe the miscible-immiscible transition between the two condensates. The work positions the platform for future studies of dipolar effects in mixtures, including multi-component supersolidity.

Significance. If the experimental claims hold, the result establishes a new tunable dipolar Bose mixture with efficient thermalization, which is a practical advantage for reaching degeneracy. This could enable controlled studies of dipolar multi-component physics that are difficult in other systems.

minor comments (2)
  1. [Abstract] Abstract: the statement that evaporation trajectories 'closely follow' the single-isotope case is presented without quantitative comparison (e.g., atom number or temperature vs. time); adding a brief metric or reference to a figure would strengthen the claim.
  2. [Abstract] The manuscript does not specify the magnetic-field location or width of the interspecies Feshbach resonance in the abstract or early sections; providing these values (or a citation to the resonance characterization) would clarify the accessible interaction range.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive assessment of our work and the recommendation for minor revision. No major comments were provided in the report.

Circularity Check

0 steps flagged

No significant circularity: purely experimental report

full rationale

The manuscript is an experimental realization paper reporting the production of a quantum-degenerate 162Dy-164Dy Bose-Bose mixture, observation of a tunable miscible-immiscible transition via an interspecies Feshbach resonance, and positioning the system for future dipolar studies. No derivation chain, fitted parameters, predictions, or self-referential equations appear in the abstract or described content. The statement that evaporation trajectories follow the single-isotope case is presented as a direct consequence of the isotopes' near-identical mass and polarizability—an external physical fact, not an internal fit or self-definition. No load-bearing self-citations, ansatzes, or uniqueness theorems are invoked. The work is self-contained against external benchmarks and receives the default non-circularity finding.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review; no free parameters, axioms, or invented entities can be identified from the provided text.

pith-pipeline@v0.9.1-grok · 5671 in / 1117 out tokens · 18127 ms · 2026-06-26T05:56:12.425831+00:00 · methodology

discussion (0)

Sign in with ORCID, Apple, or X to comment. Anyone can read and Pith papers without signing in.

Reference graph

Works this paper leans on

36 extracted references

  1. [1]

    Chomaz, I

    L. Chomaz, I. Ferrier-Barbut, F. Ferlaino, B. Laburthe-Tolra, B. L. Lev, and T. Pfau. Dipolar physics: A review of experiments with magnetic quantum gases.Reports on Progress in Physics, 86(2):026401, dec 2022

    2022

  2. [2]

    Tanzi, E

    L. Tanzi, E. Lucioni, F. Fam` a, J. Catani, A. Fioretti, C. Gabbanini, R. N. Bisset, L. Santos, and G. Modugno. Observation of a dipolar quantum gas with metastable supersolid properties. Phys. Rev. Lett., 122:130405, apr 2019

    2019

  3. [3]

    B¨ ottcher, J.-N

    F. B¨ ottcher, J.-N. Schmidt, M. Wenzel, J. Hertkorn, M. Guo, T. Langen, and T. Pfau. Tran- sient supersolid properties in an array of dipolar quantum droplets.Phys. Rev. X, 9:011051, mar 2019

    2019

  4. [4]

    Chomaz, D

    L. Chomaz, D. Petter, P. Ilzh¨ ofer, G. Natale, A. Trautmann, C. Politi, G. Durastante, R. M. W. van Bijnen, A. Patscheider, M. Sohmen, M. J. Mark, and F. Ferlaino. Long- lived and transient supersolid behaviors in dipolar quantum gases.Phys. Rev. X, 9:021012, apr 2019. 9

    2019

  5. [5]

    Trautmann, P

    A. Trautmann, P. Ilzh¨ ofer, G. Durastante, C. Politi, M. Sohmen, M. J. Mark, and F. Ferlaino. Dipolar quantum mixtures of erbium and dysprosium atoms.Phys. Rev. Lett., 121:213601, nov 2018

    2018

  6. [6]

    Bland, E

    T. Bland, E. Poli, L. A. Pe˜ na Ardila, L. Santos, F. Ferlaino, and R. N. Bisset. Alternating- domain supersolids in binary dipolar condensates.Physical Review A, 106(5):053322, nov 2022

    2022

  7. [7]

    R. N. Bisset, L. A. Pe˜ na Ardila, and L. Santos. Quantum droplets of dipolar mixtures.Phys. Rev. Lett., 126:025301, jan 2021

    2021

  8. [8]

    Scheiermann, L

    D. Scheiermann, L. A. Pe˜ na Ardila, T. Bland, R. N. Bisset, and L. Santos. Catalyzation of supersolidity in binary dipolar condensates.Phys. Rev. A, 107:L021302, feb 2023

    2023

  9. [9]

    Arazo, A

    M. Arazo, A. Gallem´ ı, M. Guilleumas, R. Mayol, and L. Santos. Self-bound crystals of antiparallel dipolar mixtures.Phys. Rev. Res., 5:043038, oct 2023

    2023

  10. [10]

    A.-C. Lee, D. Baillie, and P. B. Blakie. Stability of a flattened dipolar binary condensate: Emergence of the spin roton.Phys. Rev. Res., 4:033153, aug 2022

    2022

  11. [11]

    N. Q. Burdick, K. Baumann, Y. Tang, M. Lu, and B. L. Lev. Fermionic suppression of dipolar relaxation.Phys. Rev. Lett., 114:023201, jan 2015

    2015

  12. [12]

    Claude, L

    F. Claude, L. Lafforgue, J. J. A. Houwman, M. J. Mark, and F. Ferlaino. Optical manipulation of spin states in ultracold magnetic atoms via an inner-shell hz transition. arXiv:2405.01499, 2024

    arXiv 2024

  13. [13]

    Lecomte, A

    M. Lecomte, A. Journeaux, J. Veschambre, J. Dalibard, and R. Lopes. Production and stabilization of a spin mixture of ultracold dipolar bose gases.Phys. Rev. Lett., 134:013402, jan 2025

    2025

  14. [14]

    Duerbeck, L

    M. Duerbeck, L. Reihs, J. Seifert, B. Choudhari, J. P. Marulanda-Serna, N. Werum, M. De Pas, G. Meijer, and G. Valtolina. Dual-isotope narrow-line MOT of dysprosium by phase modula- tion.Submitted, 2026

    2026

  15. [15]

    Dreon, L

    D. Dreon, L. A. Sidorenkov, C. Bouazza, W. Maineult, J. Dalibard, and S. Nascimbene. Optical cooling and trapping of highly magnetic atoms: the benefits of a spontaneous spin polarization.Journal of Physics B: Atomic, Molecular and Optical Physics, 50(6):065005, mar 2017

    2017

  16. [16]

    Maier, H

    T. Maier, H. Kadau, M. Schmitt, A. Griesmaier, and T. Pfau. Narrow-line magneto-optical trap for dysprosium atoms.Opt. Lett., 39(11):3138–3141, jun 2014

    2014

  17. [17]

    Krstaji´ c, P

    M. Krstaji´ c, P. Juh´ asz, J. Kuˇ cera, L. R. Hofer, G. Lamb, A. L. Marchant, and R. P. Smith. Characterization of three-body loss in 166Er and optimized production of large bose-einstein condensates.Phys. Rev. A, 108:063301, dec 2023

    2023

  18. [18]

    Modugno, G

    G. Modugno, G. Ferrari, G. Roati, R. J. Brecha, A. Simoni, and M. Inguscio. Bose-einstein condensation of potassium atoms by sympathetic cooling.Science, 294(5545):1320–1322, 2001. 10

    2001

  19. [19]

    De Marco, G

    L. De Marco, G. Valtolina, K. Matsuda, W. G. Tobias, J. P. Covey, and J. Ye. A degenerate fermi gas of polar molecules.Science, 363(6429):853–856, 2019

    2019

  20. [20]

    Baroni, G

    C. Baroni, G. Lamporesi, and M. Zaccanti. Quantum mixtures of ultracold gases of neutral atoms.Nature Reviews Physics, 6(12):736–752, nov 2024

    2024

  21. [21]

    A. G. Volosniev, G. Bighin, L. Santos, and L. A. Pe˜ na Ardila. Non-equilibrium dynamics of dipolar polarons.SciPost Phys., 15:232, 2023

    2023

  22. [22]

    Chomaz et al

    L. Chomaz et al. Dipolar physics: A review of experiments with magnetic quantum gases. Reports on Progress in Physics, 86(2):026401, dec 2022

    2022

  23. [23]

    Maier, H

    T. Maier, H. Kadau, M. Schmitt, M. Wenzel, I. Ferrier-Barbut, T. Pfau, A. Frisch, S. Baier, K. Aikawa, L. Chomaz, M. J. Mark, F. Ferlaino, C. Makrides, E. Tiesinga, A. Petrov, and S. Kotochigova. Emergence of chaotic scattering in ultracold er and dy.Phys. Rev. X, 5:041029, nov 2015

    2015

  24. [24]

    Durastante, C

    G. Durastante, C. Politi, M. Sohmen, P. Ilzh¨ ofer, M. J. Mark, M. A. Norcia, and F. Ferlaino. Feshbach resonances in an erbium-dysprosium dipolar mixture.Phys. Rev. A, 102:033330, sep 2020

    2020

  25. [25]

    Frisch, M

    A. Frisch, M. Mark, K. Aikawa, F. Ferlaino, J. L. Bohn, C. Makrides, A. Petrov, and S. Kotochigova. Quantum chaos in ultracold collisions of gas-phase erbium atoms.Nature, 507(7493):475–479, 2014

    2014

  26. [26]

    Scazza, G

    F. Scazza, G. Del Pace, L. Pieri, R. Concas, W. J. Kwon, and G. Roati. A low-impedance radio-frequency circuit for fast spin manipulations in cold alkali atoms.Review of Scientific Instruments, 96(10):104713, oct 2025

    2025

  27. [27]

    D. S. Hall, M. R. Matthews, J. R. Ensher, C. E. Wieman, and E. A. Cornell. Dynamics of component separation in a binary mixture of bose-einstein condensates.Phys. Rev. Lett., 81:1539–1542, aug 1998

    1998

  28. [28]

    S. B. Papp, J. M. Pino, and C. E. Wieman. Tunable miscibility in a dual-species bose-einstein condensate.Phys. Rev. Lett., 101:040402, jul 2008

    2008

  29. [29]

    D. J. McCarron, H. W. Cho, D. L. Jenkin, M. P. K¨ oppinger, and S. L. Cornish. Dual-species bose-einstein condensate of 87Rb and 133Cs.Phys. Rev. A, 84:011603(R), jul 2011

    2011

  30. [30]

    Wacker, N

    L. Wacker, N. B. Jørgensen, D. Birkmose, R. Horchani, W. Ertmer, C. Klempt, N. Winter, J. Sherson, and J. J. Arlt. Tunable dual-species bose-einstein condensates of 39K and 87Rb. Phys. Rev. A, 92:053602, nov 2015

    2015

  31. [31]

    Burchianti, C

    A. Burchianti, C. D’Errico, S. Rosi, A. Simoni, M. Modugno, C. Fort, and F. Minardi. Dual- species bose-einstein condensate of 41K and 87Rb in a hybrid trap.Phys. Rev. A, 98:063616, dec 2018

    2018

  32. [32]

    Politi, A

    C. Politi, A. Trautmann, P. Ilzh¨ ofer, G. Durastante, M. J. Mark, M. Modugno, and F. Ferlaino. Interspecies interactions in an ultracold dipolar mixture.Phys. Rev. A, 105:023304, feb 2022. 11

    2022

  33. [33]

    R. K. Kumar, P. Muruganandam, L. Tomio, and A. Gammal. Miscibility in coupled dipolar and non-dipolar bose–einstein condensates.Journal of Physics Communications, 1(3):035012, nov 2017

    2017

  34. [34]

    A.-C. Lee, D. Baillie, P. B. Blakie, and R. N. Bisset. Miscibility and stability of dipolar bosonic mixtures.Phys. Rev. A, 103:063301, jun 2021

    2021

  35. [35]

    Kirkby, A.-C

    W. Kirkby, A.-C. Lee, D. Baillie, T. Bland, F. Ferlaino, P. B. Blakie, and R. N. Bisset. Excitations of a binary dipolar supersolid.Phys. Rev. Lett., 133:103401, sep 2024

    2024

  36. [36]

    Masalaeva, W

    N. Masalaeva, W. Kirkby, F. Ferlaino, and R. N. Bisset. Quantum vortex channels as josephson junctions. arXiv:2602.01889, 2026. 12

    arXiv 2026