Andriy Nevidomskyy
· ProfessorVerifiedRice University · Physics
Active 2000–2025
About
Dr. Andriy Nevidomskyy is an expert in theoretical condensed matter physics, working in the field of strong electron correlations in quantum materials. His research focuses on the collective behaviour of electrons in such materials, which often results in the emergence of new exotic quantum phases, such as unconventional superconductivity. Nevidomskyy is working on heavy fermion materials and a new class of iron-based superconductors, with a particular interest in the novel quantum phases emerging in frustrated magnets. Originally from Ukraine, he received his PhD in physics from Cambridge University in the UK. He then worked as a postdoctoral fellow at Université de Sherbrooke in Canada, focusing on high-temperature cuprate superconductors. Prior to joining Rice University in 2010, he was a postdoctoral researcher at the Center for Materials Theory at Rutgers University, conducting research into heavy fermion materials. He has been recognized with awards such as the NSF CAREER Award and the Cottrell Scholar Award from Research Corporation for Science Advancement.
Research topics
- Condensed matter physics
- Physics
- Quantum mechanics
- Combinatorics
- Mathematics
- Geometry
- Chemistry
- Materials science
Selected publications
Dipolar-octupolar correlations and hierarchy of exchange interactions in Ce$_2$Hf$_2$O$_7$
DORA PSI (Paul Scherrer Institute) · 2025-01-01
article6 pages, 3 figures
Algebraic Fusion in a (2+1)-dimensional Lattice Model with Generalized Symmetries
arXiv (Cornell University) · 2025-12-24
preprintOpen accessSenior authorThe notion of quantum symmetry has recently been extended to include reduced-dimensional transformations and algebraic structures beyond groups. Such generalized symmetries lead to exotic phases of matter and excitations that defy Landau's original paradigm. Here, we develop an algebraic framework for systematically deriving the fusion rules of topological defects in higher-dimensional lattice systems with non-invertible generalized symmetries, and focus on a (2+1)-dimensional quantum Ising plaquette model as a concrete illustration. We show that bond-algebraic automorphisms, when combined with the so-called half-gauging procedure, reveal the structure of the non-invertible duality symmetry operators, which can be explicitly represented as a sequential quantum circuit. The resulting duality defects are constrained by the model's rigid higher symmetries (lower-dimensional subsystem symmetries), leading to restricted mobility. We establish the fusion algebra of these defects. Finally, in constructing the non-invertible duality transformation, we explicitly verify that it acts as a partial isometry on the physical Hilbert space, thereby satisfying a recent generalization of Wigner's theorem applicable to non-invertible symmetries.
Physical review. B./Physical review. B · 2025-04-21 · 4 citations
articleOpen accessThe recently discovered dipole-octupole pyrochlore magnet ${\mathrm{Ce}}_{2}{\mathrm{Hf}}_{2}{\mathrm{O}}_{7}$ is a promising three-dimensional quantum spin liquid candidate, which shows no signs of ordering at low temperature. The low-energy effective pseudospin-1/2 description in a magnetic field is characterized by the XYZ Hamiltonian and a Zeeman term where the dipolar local $z$ component of the pseudospin couples to the local $z$ component of the applied magnetic field, while the local $x$ and $y$ components of the pseudospin remain decoupled as a consequence of their octupolar character. Using effective Hamiltonian parameters determined in Poree et al., arXiv:2305.08261, remarkable experimental features can be reproduced, as for instance the specific heat and magnetization data as well as the continuum of states seen in neutron scattering. Here we investigate the thermodynamic response to magnetic fields applied along the global [110] direction using specific heat measurements and fits using numerical methods, and solve the corresponding magnetic structure using neutron diffraction. Specific heat data in moderate fields are reproduced well, however, at high fields the agreement is not satisfactory. We especially observe a two-step release of entropy, a finding that demands a review of both theory and experiment. We address it within the framework of three possible scenarios, including an analysis of the crystal field Hamiltonian not restricted to the two-dimensional single-ion doublet subspace. We conclusively rule out two of these scenarios and find qualitative agreement with a simple model of field misalignment with respect to the crystalline direction. We discuss the implications of our findings for [111] applied fields and for future experiments on ${\mathrm{Ce}}_{2}{\mathrm{Hf}}_{2}{\mathrm{O}}_{7}$ and its sister compounds.
Simulating spin dynamics of supersolid states in a quantum Ising magnet
Physical review. B./Physical review. B · 2025-02-04 · 11 citations
articleOpen accessSenior authorMotivated by a recent experimental study on the quantum Ising magnet ${\text{K}}_{2}\text{Co}{({\text{SeO}}_{3})}_{2}$ that presented spectroscopic evidence of zero-field supersolidity (Chen et al., arXiv:2402.15869), we simulate the excitation spectrum of the corresponding microscopic $XXZ$ model for the compound using the recently developed excitation ansatz for infinite projected entangled-pair states. We map out the ground state phase diagram and compute the dynamical spin structure factors across a range of magnetic field strengths, focusing especially on the two supersolid phases found near zero and saturation fields. Our simulated excitation spectra for the zero-field supersolid ``Y'' phase are in excellent agreement with the experimental data, recovering the low-energy branches and integer quantized excited energy levels ${\ensuremath{\omega}}_{n}=n{J}_{zz}$. Furthermore, we demonstrate the nonlocal multi-spin-flip features for modes at ${\ensuremath{\omega}}_{2}$, indicative of their multimagnon nature. Additionally, we identify characteristics of the high-field supersolid ``$\mathrm{\ensuremath{\Psi}}$'' phase in the simulated spectra, which should be compared with future experimental results.
Particle-hole asymmetric phases in doped twisted bilayer graphene
Physical review. B./Physical review. B · 2025-03-17
articleSenior authorTwisted bilayer graphene (TBG) has emerged as a paradigmatic platform for exploring the interplay between strong interactions in a multiband system with nearly flat bands, while offering unprecedented control over the filling fraction of electron and hole carriers. Despite much theoretical work, developing a comprehensive ab initio model for this system has proven challenging due to the inherent tradeoff between accurately describing the band structure and incorporating the interactions within the Hamiltonian, particularly given the topological obstruction---so-called fragile topology---to the description of the model in terms of localized symmetric Wannier functions within the flat band manifold. Here, we circumvent this obstruction by using an extended eight-orbital model, for which localized Wannier orbitals have been formulated by [Carr et al., Phys. Rev. Res. 1, 033072 (2019)]. We constructed an extended multiorbital Hubbard model, and performed Hartree-Fock (HF) calculations to explore its phase diagram across commensurate fillings from $\ensuremath{-}3$ to 3. We found several nearly degenerate insulating states at charge neutrality, all of which exhibit orbital orders. Crucially, TBG near magic angle is known to be particle-hole asymmetric, which is naturally captured by the single-particle band structure of our model and is reflected in the distinction between the symmetry broken states obtained at electron and hole dopings away from the charge neutral point. At filling $\ensuremath{-}1$ and $+2$, quantum anomalous hall state and inter-orbital inter-valley coherent states are obtained, while for the rest of the integer fillings away from charge neutrality, we found the system to realize metallic states with various orbital, valley and spin orderings. We also observed that most of the Hartree--Fock ground states exhibit a generalized valley Hund's-like rule, resulting in valley polarization. Importantly, we show that the incorporation of the intravalley and intervalley exchange interactions is crucial to properly stabilize the ordered symmetry-broken states. In agreement with experiments, we find significant particle-hole asymmetry, which underscores the importance of using particle-hole asymmetric models.
Zenodo (CERN European Organization for Nuclear Research) · 2025-12-19
datasetOpen accessSenior authorSleuthing out the symmetry of a superconductor
Science · 2025-05-29
letter1st authorCorrespondingExperimental observations provide clues to understanding an enigmatic superconductor, uranium ditelluride.
High-field superconducting halo in UTe <sub>2</sub>
Science · 2025-07-31 · 5 citations
articleThe heavy fermion material UTe 2 is a candidate topological superconductor that exhibits multiple magnetic field–induced superconducting phases. One such phase exists only at fields greater than 40 tesla, a considerable scale given its critical temperature of only 2 K. Here, we extend measurements of this state with fields outside of the bc crystallographic plane and reveal its core structure: The superconducting phase wraps around the b axis in a halo-like fashion and appears to be stabilized by a field component perpendicular to the magnetic easy axis. This angle dependence points to a multicomponent spin-triplet order parameter with a finite angular momentum of the Cooper pairs. The pairing mechanism remains enigmatic, and UTe 2 ’s specific magnetophilic superconducting tendencies seem incompatible with existing models for field-enhanced superconductivity.
Algebraic Fusion in a (2+1)-dimensional Lattice Model with Generalized Symmetries
ArXiv.org · 2025-12-24
articleOpen accessSenior authorThe notion of quantum symmetry has recently been extended to include reduced-dimensional transformations and algebraic structures beyond groups. Such generalized symmetries lead to exotic phases of matter and excitations that defy Landau's original paradigm. Here, we develop an algebraic framework for systematically deriving the fusion rules of topological defects in higher-dimensional lattice systems with non-invertible generalized symmetries, and focus on a (2+1)-dimensional quantum Ising plaquette model as a concrete illustration. We show that bond-algebraic automorphisms, when combined with the so-called half-gauging procedure, reveal the structure of the non-invertible duality symmetry operators, which can be explicitly represented as a sequential quantum circuit. The resulting duality defects are constrained by the model's rigid higher symmetries (lower-dimensional subsystem symmetries), leading to restricted mobility. We establish the fusion algebra of these defects. Finally, in constructing the non-invertible duality transformation, we explicitly verify that it acts as a partial isometry on the physical Hilbert space, thereby satisfying a recent generalization of Wigner's theorem applicable to non-invertible symmetries.
Zenodo (CERN European Organization for Nuclear Research) · 2025-12-19
datasetOpen accessSenior author
Recent grants
Frequent coauthors
- 34 shared
Piers Coleman
Royal Holloway University of London
- 30 shared
E. Morosan
Rice University
- 29 shared
Pengcheng Dai
- 23 shared
Han Yan
Rice University
- 22 shared
Vaideesh Loganathan
Rice University
- 19 shared
C.-L. Huang
National Cheng Kung University
- 17 shared
Qimiao Si
- 14 shared
Alannah M. Hallas
Education
- 2005
Ph.D., Physics
University of Cambridge
- 2001
M.Sc. summa cum laude, Physics
Ivan Franko National University
Awards & honors
- NSF CAREER Award
- Cottrell Scholar Award from Research Corporation for Science…
- Resume-aware match score
- Save to shortlist
- AI-drafted outreach
See your match with Andriy Nevidomskyy
PhdFit ranks faculty by your research interests, methods, and publications — grounded in their actual work, not templates.
- Free to start
- No credit card
- 30-second signup