182 citations · 650 across the 19 of their papers we have counts for
22 papers
Non-Abelian quantum Hall states at strong Landau level mixing: finding anyons with first-principles AI
Pierre-Antoine Graham, Ahmed Abouelkomsan, Liang Fu
Non-Abelian anyons, strange particles forming the basis of fault-tolerant topological quantum computing, are predicted to emerge in fractional quantum Hall states at even-denominat…
Quantization through dissipation: impurity states and the optical quantum Hall effect
Zhenisbek Tagay, Ahmed Abouelkomsan, Yugo Onishi +4
The integer quantum Hall effect remains the most paradigmatic and remarkable example of exact quantization in condensed matter physics. Its Hall conductivity is fixed to $…
Zoology of chiral superconductors in Chern bands
André Grossi Fonseca, Aidan Reddy, Ahmed Abouelkomsan +2
Evidence for chiral superconductivity has recently been observed in several van der Waals systems including rhombohedral multilayer graphene and twisted bilayer MoTe. In the la…
Rhombohedral Graphene: A Tale of Many Crystals
Ahmed Abouelkomsan, Filippo Gaggioli, Daniele Guerci +1
Experiments on rhombohedral graphene have uncovered an extraordinary wealth of correlated quantum phases - from chiral superconductors to electronic crystals - all within a single…
Scaling universal Fermi network toward ground states: A diffusion-Monte-Carlo assessment
Yu-Sheng Li, Saskia Poldmaa, Tzen Ong +4
In this work, we show that Fermi Sets---a provably universal neural network architecture for fermionic wavefunctions---can be systematically scaled up to find interacting ground st…
Topological superconductivity with emergent vortex lattice in twisted semiconductors
Daniele Guerci, Ahmed Abouelkomsan, Liang Fu
The coexistence of superconductivity and fractional quantum anomalous Hall (FQAH) effect has recently been observed in twisted MoTe and theoretically demonstrated in a model of…
First-Principles AI finds crystallization of fractional quantum Hall liquids
Ahmed Abouelkomsan, Liang Fu
When does a fractional quantum Hall (FQH) liquid crystallize? Addressing this question requires a framework that treats fractionalization and crystallization on equal footing, espe…
From Fractionalization to Chiral Topological Superconductivity in a Flat Chern Band
Daniele Guerci, Ahmed Abouelkomsan, Liang Fu
We show that interacting electrons in a flat Chern band can form, in addition to fractional Chern insulators, a chiral -wave topological superconductor that hosts neutral Majora…
Shining light on collective modes in moiré fractional Chern insulators
Nisarga Paul, Ahmed Abouelkomsan, Aidan Reddy +1
We show that collective excitations and optical responses of moiré fractional Chern insulators (FCIs) drastically differ from those of standard fractional quantum Hall (FQH) states…
Anti-topological crystal and non-Abelian liquid in twisted semiconductor bilayers
Aidan P. Reddy, D. N. Sheng, Ahmed Abouelkomsan +2
We show that electron crystals compete closely with non-Abelian fractional Chern insulators in the half-filled second moiré band of twisted bilayer MoTe. Depending on the twist…
Non-Abelian spin Hall insulator
Ahmed Abouelkomsan, Liang Fu
Motivated by a recent experiment reporting the fractional quantum spin Hall effect in twisted , we investigate microscopically the prospects of realizing exotic topol…
Compressible quantum liquid with vanishing Drude weight
Ahmed Abouelkomsan, Nisarga Paul, Ady Stern +1
We explore the possibility of quantum liquids that are compressible but have vanishing DC conductivity in the absence of disorder. We show that the composite Fermi liquid emerging…
Non-Abelian fractionalization in topological minibands
Aidan P. Reddy, Nisarga Paul, Ahmed Abouelkomsan +1
Motivated by the recent discovery of fractional quantum anomalous Hall states in moiré systems, we consider the possibility of realizing non-Abelian phases in topological minibands…
Quantum anomalous Hall crystal at fractional filling of moiré superlattices
D. N. Sheng, Aidan P. Reddy, Ahmed Abouelkomsan +2
We predict the emergence a state of matter with intertwined ferromagnetism, charge order and topology in fractionally filled moiré superlattice bands. Remarkably, these quantum ano…
Broken Symmetry in Ideal Chern Bands
Hui Liu, Kang Yang, Ahmed Abouelkomsan +2
Recent observations of the fractional anomalous quantum Hall effect in moiré materials have reignited the interest in fractional Chern insulators (FCIs). The chiral limit in which…
Band mixing in the quantum anomalous Hall regime of twisted semiconductor bilayers
Ahmed Abouelkomsan, Aidan P. Reddy, Liang Fu +1
Remarkable recent experiments have observed fractional quantum anomalous Hall (FQAH) effects at zero field and unusually high temperatures in twisted semiconductor bilayer MoTe$…
Multiferroicity and Topology in Twisted Transition Metal Dichalcogenides
Ahmed Abouelkomsan, Emil J. Bergholtz, Shubhayu Chatterjee
Van der Waals heterostructures have recently emerged as an exciting platform for investigating the effects of strong electronic correlations, including various forms of magnetic or…
Topological and stacked flat bands in bilayer graphene with a superlattice potential
Sayed Ali Akbar Ghorashi, Aaron Dunbrack, Ahmed Abouelkomsan +3
We show that bilayer graphene in the presence of a 2D superlattice potential provides a highly tunable setup that can realize a variety of flat band phenomena. We focus on two regi…
Quantum Metric Induced Phases in Moiré Materials
Ahmed Abouelkomsan, Kang Yang, Emil J. Bergholtz
We show that, quite generally, quantum geometry plays a major role in determining the low-energy physics in strongly correlated lattice models at fractional band fillings. We ident…
Topological Lattice Models with Constant Berry Curvature
Daniel Varjas, Ahmed Abouelkomsan, Kang Yang +1
Band geometry plays a substantial role in topological lattice models. The Berry curvature, which resembles the effect of magnetic field in reciprocal space, usually fluctuates thro…
Gate-Tunable Fractional Chern Insulators in Twisted Double Bilayer Graphene
Zhao Liu, Ahmed Abouelkomsan, Emil J. Bergholtz
We predict twisted double bilayer graphene to be a versatile platform for the realization of fractional Chern insulators readily targeted by tuning the gate potential and the twist…
Particle-Hole Duality, Emergent Fermi Liquids and Fractional Chern Insulators in Moiré Flatbands
Ahmed Abouelkomsan, Zhao Liu, Emil J. Bergholtz
Moiré flatbands, occurring, e.g., in twisted bilayer graphene at magic angles, have attracted ample interest due to their high degree of experimental tunability and the intriguing…