307 citations · 1.9k across the 40 of their papers we have counts for
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Charge Density Waves and In-Gap States in Coupled Chains and Moiré Superlattices
Muhammad Akram, Onur Erten
Charge density waves (CDWs) arise from the interplay between electrons and lattice distortions and are a hallmark of low-dimensional systems. Here we study coupled Su-Schrieffer-He…
Exactly solvable spin liquids in Kitaev bilayers and moiré superlattices
Ivan Dutta, Anamitra Mukherjee, Onur Erten +1
Building on the recent advancements on moiré superlattices, we propose an exactly solvable model with Kitaev-type interactions on a bilayer honeycomb lattice for both AA stacking a…
Octupolar vortex crystal and toroidal moment in twisted bilayer MnPSe
Muhammad Akram, Fan Yang, Turan Birol +1
Experimental detection of antiferromagnetic order in two-dimensional materials is a challenging task due to the absence of net dipole moments. Identifying multi-domain antiferromag…
Nematic heavy fermions and coexisting magnetic order in CeSiI
Aayush Vijayvargia, Onur Erten
Motivated by the recent discovery of magnetism and heavy quasiparticles in van der Waals material CeSiI, we develop an effective model that incorporates the conduction electrons re…
Thermodynamics of vison crystals in an anisotropic quantum spin liquid
Ritwika Majumder, Onur Erten, Anamitra Mukherjee
Using unbiased Monte Carlo simulations and variational analysis, we present the ground state and finite temperature phase diagrams of an exactly solvable spin-orbital model with Ki…
Topological and magnetic phase transitions in the bilayer Kitaev-Ising model
Aayush Vijayvargia, Urban F. P. Seifert, Onur Erten
We investigate the phase diagram of a bilayer Kitaev honeycomb model with Ising interlayer interactions, deriving effective models via perturbation theory and performing Majorana m…
A Kitaev-type spin liquid on a quasicrystal
M. A. Keskiner, O. Erten, M. Ö. Oktel
We develop an exactly solvable model with Kitaev-type interactions and study its phase diagram on the dual lattice of the quasicrystalline Ammann-Beenker lattice. Our construction…
Vison crystals, chiral and crystalline phases in the Yao-Lee model
Muhammad Akram, Emilian Marius Nica, Yuan-Ming Lu +1
We study the phase diagram of the Yao-Lee model with Kitaev-type spin-orbital interactions in the presence of Dzyaloshinskii-Moriya interactions and external magnetic fields. Unlik…
Magnetic fragmentation and fractionalized Goldstone modes in a bilayer quantum spin liquid
Aayush Vijayvargia, Emilian Marius Nica, Roderich Moessner +2
We study the phase diagram of a bilayer quantum spin liquid model with Kitaev-type interactions on a square lattice. We show that the low energy limit is described by a -flux Hu…
Persistence of correlation-driven surface states in SmB6 under pressure
Soonbeom Seo, Yongkang Luo, S. M. Thomas +6
The proposed topological Kondo insulator SmB hosts a bulk Kondo hybridization gap that stems from strong electronic correlations and a metallic surface state whose effective…
Skyrmion formation in Ni-based Janus dihalide monolayers: Interplay between magnetic frustration and Dzyaloshinskii-Moriya interaction
Taylan Gorkan, Jyotirish Das, Jesse Kapeghian +6
We present a comprehensive theory of the magnetic phases in monolayer nickel-based Janus dihalides (NiIBr, NiICl, NiBrCl) through a combination of first-principles calculations and…
Kitaev spin-orbital bilayers and their moiré superlattices
Emilian Nica, Muhammad Akram, Aayush Vijayvargia +2
We determine the phase diagram of a bilayer, Yao-Lee spin-orbital model with inter-layer interactions (J), for several stackings and moiré superlattices. For AA stacking, a gapped…
Moiré skyrmions and chiral magnetic phases in twisted CrX (X I, Br, Cl) bilayers
Muhammad Akram, Harrison LaBollita, Dibyendu Dey +3
We present a comprehensive theory of the magnetic phases in twisted bilayer Cr-trihalides through a combination of first-principles calculations and atomistic simulations. We show…
Shadow surface states in topological Kondo insulators
Areg Ghazaryan, Emilian M. Nica, Onur Erten +1
The surface states of 3D topological insulators in general have negligible quantum oscillations when the chemical potential is tuned to the Dirac points. In contrast, we find that…
Topological Quantum Many-Body Scars in Quantum Dimer Models on the Kagome Lattice
Julia Wildeboer, Alexander Seidel, N. S. Srivatsa +2
We present a class of quantum dimer models on the kagome lattice with full translational invariance that feature a quantum many-body scar state of analytically known entanglement p…
Skyrmions in twisted van der Waals magnets
Muhammad Akram, Onur Erten
Magnetic skyrmions in 2D chiral magnets are in general stabilized by a combination of Dzyaloshinskii-Moriya interaction and external magnetic field. Here, we show that skyrmions ca…
Fermi surface enlargement on the Kondo lattice
Eoin Quinn, Onur Erten
The Kondo lattice model is a paradigmatic model for the description of local moment systems, a class of materials exhibiting a range of strongly correlated phenomena including heav…
Direct visualization of coexisting channels of interaction in CeSb
Sooyoung Jang, Robert Kealhofer, Caolan John +7
Our understanding of correlated electron systems is vexed by the complexity of their interactions. Heavy fermion compounds are archetypal examples of this physics, leading to exoti…
Why rare-earth ferromagnets are so rare: insights from the p-wave Kondo model
Shadab Ahamed, Roderich Moessner, Onur Erten
Magnetic exchange in Kondo lattice systems is of the Ruderman-Kittel-Kasuya-Yosida type, whose sign depends on the Fermi wave vector, . In the simplest setting, for small $k_…
Effect of Applied Orthorhombic Lattice Distortion on the Antiferromagnetic Phase of CeAuSb
Joonbum Park, Hideaki Sakai, Onur Erten +2
We study the response of the antiferromagnetism of CeAuSb to orthorhombic lattice distortion applied through in-plane uniaxial pressure. The response to pressure applied along…
Skyrme insulators: insulators at the brink of superconductivity
Onur Erten, Po-Yao Chang, Piers Coleman +1
Current theories of superfluidity are based on the idea of a coherent quantum state with topologically protected, quantized circulation. When this topological protection is absent,…
Möbius Kondo Insulators
Po-Yao Chang, Onur Erten, Piers Coleman
Heavy fermion materials have recently attracted attention for their potential to combine topological protection with strongly correlated electron physics. To date, the ideas of top…
Kondo Breakdown and Quantum Oscillations in SmB
Onur Erten, Pouyan Ghaemi, Piers Coleman
Recent quantum oscillation experiments on SmB pose a paradox, for while the angular dependence of the oscillation frequencies suggest a 3D bulk Fermi surface, SmB remains r…
Kondo Breakdown in Topological Kondo Insulators
Victor Alexandrov, Piers Coleman, Onur Erten
Motivated by the observation of light surface states in SmB6, we examine the effects of surface Kondo breakdown in topological Kondo insulators. We present both numerical and analy…