307 citations · 1.9k across the 40 of their papers we have counts for
41 papers
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…
Tuning the electronic and magnetic properties of NiBr via pressure
Soumen Bag, Jesse Kapeghian, Onur Erten +1
Transition metal dihalides (MX, M= transition metal, X= halide) have attracted much attention recently due to their intriguing low-dimensional magnetic properties. Particular f…
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…
Theory of moiré magnetism in twisted bilayer -RuCl
Muhammad Akram, Jesse Kapeghian, Jyotirish Das +3
Twisted heterostructures of van der Waals materials have received much attention for their many remarkable properties. Here, we present a comprehensive theory of the long-range ord…
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…
Revival of antibiskyrmionic magnetic phases in bilayer NiI
Jyotirish Das, Muhammad Akram, Onur Erten
Magnetic skyrmions are topologically protected spin textures with potential applications in memory and logic devices. Skyrmions have been commonly observed in systems with Dzyalosh…
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…
Superconductivity in a quintuple-layer square-planar nickelate
Grace A. Pan, Dan Ferenc Segedin, Harrison LaBollita +18
Since the discovery of high-temperature superconductivity in the copper oxide materials, there have been sustained efforts to both understand the origins of this phase and discover…
Matrix-pairing states in the alkaline Fe-selenide superconductors: exotic Josephson junctions
Emilian M. Nica, Qimiao Si, Onur Erten
True to their unconventional nature, multi-band alkaline Fe-selenides and, more recently, the heavy-fermion CeCuSi have shown signatures of fully-gapped but sign-changi…
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…
Synthesis, Engineering, and Theory of 2D van der Waals Magnets
M. Blei, J. L. Lado, Q. Song +6
Spontaneous magnetic order is a routine instance in three-dimensional (3D) materials but for a long time, it remained elusive in the 2D world. Recently, the first examples of (stan…
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…
Theory of pairing in mixed-valent correlated metals
Emilian M. Nica, Onur Erten
Motivated by the recent discovery of superconductivity in square-planar nickelates as well as by longstanding puzzling experiments in heavy-fermion superconductors, we study Cooper…
Theoretical investigation of superconductivity in trilayer square-planar nickelates
Emilian M. Nica, Jyoti Krishna, Rong Yu +3
The discovery of superconductivity in Sr-doped NdNiO is a crucial breakthrough in the long pursuit for nickel oxide materials with electronic and magnetic properties similar…