Publications (28)
Mott-insulator-to-superconductor transition in a two-dimensional superlattice
Rubem Mondaini, Predrag Nikolic, Marcos Rigol
We use quantum Monte Carlo and exact diagonalization calculations to study the Mott-insulator to superconductor quantum phase transition in a two-dimensional fermionic Hubbard mode…
Vortex states in a non-Abelian magnetic field
Predrag Nikolic
A type-II superconductor survives in an external magnetic field by admitting an Abrikosov lattice of quantized vortices. This is an imprint of the Aharonov-Bohm effect created by t…
Charge and spin fractionalization in strongly correlated topological insulators
Predrag Nikolic
We construct an effective topological Landau-Ginzburg theory that describes general SU(2) incompressible quantum liquids of strongly correlated particles in two spatial dimensions.…
Pair density wave instability and Cooper pair insulators in gapped fermion systems
Predrag Nikolic, Anton A. Burkov, Arun Paramekanti
By analyzing simple models of fermions in lattice potentials we argue that the zero-temperature pairing instability of any ideal band-insulator occurs at a finite momentum. The res…
Superfluid-insulator transitions of the Fermi gas with near-unitary interactions in a periodic potential
Eun Gook Moon, Predrag Nikolic, Subir Sachdev
We consider spin-1/2 fermions of mass m with interactions near the unitary limit. In an applied periodic potential of amplitude V and period a, and with a density of an even intege…
Disordered, Spin Liquid and Valence-Bond Ordered Phases of the Kagome Lattice Quantum Ising Models With Transverse Field and XXZ Dynamics
Predrag Nikolic
General conditions in which disordered, spin liquid, and valence-bond ordered phases occur in quantum Ising antiferromagnets are studied using the prototype Kagome lattice spin mod…
Finite Momentum Pairing Instability of Band-Insulators With Multiple Bands
Predrag Nikolic, A. A. Burkov, Arun Paramekanti
We show, based on microscopic models, that fermionic band insulators with multiple bands and strong interband attraction are generically unstable towards nonzero momentum Cooper pa…
The phase diagram of two-dimensional fast-rotating ultra-cold fermionic atoms near unitarity
Predrag Nikolic
By analyzing vortex lattices, re-entrant Cooper pairing and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in a single theoretical framework we explore how vortices and spin textur…
Low energy theory of a single vortex and electronic quasiparticles in a d-wave superconductor
Predrag Nikolic, Subir Sachdev
We highlight the properties of a simple model (contained in our recent work) of the quantum dynamics of a single point vortex interacting with the nodal fermionic quasiparticles of…
Modeling of a twisted-Kagome HoAgGe spin ice using Reduced-Configuration-Space Search and Density Functional Theory
Gunnar F. Schwertfeger, Po-Hao Chang, Predrag Nikolic +1
The Kagome lattice is a 2D network of corner sharing triangles found in several rare earth materials resulting in a complicated and often frustrated magnetic system. In the last de…
Interaction proximity effect at the interface between a superconductor and a topological insulator quantum well
Predrag Nikolic, Zlatko Tesanovic
A material whose electrons are correlated can affect electron dynamics across the interface with another material. Such a "proximity effect" can have several manifestations, from o…
s-wave Cooper pair insulators and theory of correlated superconductors
Predrag Nikolic, Zlatko Tesanovic
The pseudogap state of cuprate high-temperature superconductors has been often viewed as either a yet unknown competing order or a precursor state to superconductivity. While await…
Superconductivity at the Border of Electron Localization and Itinerancy
Rong Yu, Pallab Goswami, Qimiao Si +2
The superconducting state of iron pnictides and chalcogenides exists at the border of antiferromagnetic order. Consequently, these materials could provide clues about the relations…
Unitarity in periodic potentials: a renormalization group analysis
Predrag Nikolic
We explore the universal properties of interacting fermionic lattice systems, mostly focusing on the development of pairing correlations from attractive interactions. Using renorma…
Transverse spin photocurrents in ultrathin topological insulator films
Shahrzad Movafagh, Predrag Nikolic
Nonlinear helicity-dependent photocurrents have been reported in 3D topological materials lacking inversion symmetry. Here, we theoretically study the charge and spin photocurrents…
Effective action for vortex dynamics in clean d-wave superconductors
Predrag Nikolic, Subir Sachdev
We describe the influence of the gapless, nodal, fermionic quasiparticles of a two-dimensional d-wave superconductor on the motion of vortices. A continuum, functional formalism is…
Electronic states near a quantum fluctuating point vortex in a d-wave superconductor: Dirac fermion theory
Predrag Nikolic, Subir Sachdev, Lorenz Bartosch
We introduce a simple model of the low energy electronic states in the vicinity of a vortex undergoing quantum zero-point motion in a d-wave superconductor. The vortex is treated a…
Topological spiral magnetism in the Weyl semimetal SmAlSi
Xiaohan Yao Jonathan Gaudet, Rahul Verma, David E. Graf +13
Weyl electrons are intensely studied due to novel charge transport phenomena such as chiral anomaly, Fermi arcs, and photogalvanic effect. Recent theoretical works suggest that Wey…
Two-dimensional fermionic superfluids, pairing instability and vortex liquids in the absence of time reversal symmetry
Predrag Nikolic
We consider a generic two-dimensional system of fermionic particles with attractive interactions and no disorder. If time-reversal symmetry is absent, it is possible to obtain inco…
Superconductivity in Multi-orbital t-J1-J2 Model and its Implications for Iron Pnictides
Pallab Goswami, Predrag Nikolic, Qimiao Si
Motivated by the bad metal behavior of the iron pnictides, we study a multi-orbital model and investigate possible singlet superconducting pairings. Magnetic f…
Renormalization group fixed points, universal phase diagram, and 1/N expansion for quantum liquids with interactions near the unitarity limit
Predrag Nikolic, Subir Sachdev
It has long been known that particles with short-range repulsive interactions in spatial dimension d=1 form universal quantum liquids in the low density limit: all properties can b…
Screened moments in a Kondo insulator
Wesley T. Fuhrman, Juan R. Chamorro, Pavel A. Alekseev +5
Long known to have thermodynamic properties at odds with its insulating electrical transport, SmB6 has been the subject of great debate as it is unclear whether its unusual propert…
Effective theory of fractional topological insulators in two spatial dimensions
Predrag Nikolic
Electrons subjected to a strong spin-orbit coupling in two spatial dimensions could form fractional incompressible quantum liquids without violating the time-reversal symmetry. Her…
Fractional topological insulators of Cooper pairs induced by proximity effect
Predrag Nikolic, Tanja Duric, Zlatko Tesanovic
Certain insulating materials with strong spin-orbit coupling can conduct currents along their edges or surfaces. This phenomenon arises from the non-trivial topological properties…
Pairing instability driven by macroscopically degenerate collective modes in two-dimensional rotating fermion liquids near unitarity
Predrag Nikolic
Fermionic superfluids can undergo phase transitions into different kinds of normal regimes, loosely characterized by whether Cooper pairs remain locally stable. If the normal phase…
Tunable zero-energy Dirac and Luttinger nodes in a two-dimensional topological superconductor
Ryan Mays, Predrag Nikolic
Cooper pairing in ultrathin films of topological insulators, induced intrinsically or by proximity effect, can produce an energetically favorable spin-triplet superconducting state…
Pairing instabilities in topological insulator quantum wells
Predrag Nikolic, Zlatko Tesanovic
Topological insulator quantum wells with induced attractive interactions between electrons are candidate systems for the realization of novel vortex lattice states with time-revers…
Robust accidental nodes and zeroes and critical quasiparticle scaling in iron-based multiband superconductors
Valentin Stanev, Boian S. Alexandrov, Predrag Nikolic +1
We study multigap superconductivity, with strong angular variations of one of the gaps, as appropriate for certain iron-based high-temperature superconductors. We solve the gap equ…