Institute of Advanced Studies (IAS)
Recent Submissions

Stratification modelling of key bacterial taxa driven by metabolic dynamics in meromictic lakes
(2018)In meromictic lakes, the water column is stratified into distinguishable steady layers with different physicochemical properties. The bottom portion, known as monimolimnion, has been studied for the functional stratification ... 
Synchronization of a selfsustained coldatom oscillator
(2018)Nonlinear oscillations and synchronization phenomena are ubiquitous in nature. We study the synchronization of selfoscillating magnetooptically trapped cold atoms to a weak external driving. The oscillations arise from ... 
Cluster state generation in onedimensional Kitaev honeycomb model via shortcut to adiabaticity
(2018)We propose a mean to obtain computationally useful resource states also known as cluster states, for measurementbased quantum computation, via transitionless quantum driving algorithm. The idea is to cool the system to ... 
Scaling of geometric phase versus band structure in clusterIsing models
(2017)We study the phase diagram of a class of models in which a generalized cluster interaction can be quenched by an Ising exchange interaction and external magnetic field. The various phases are studied through winding numbers. ... 
Photon scattering by an atomic ensemble coupled to a onedimensional nanophotonic waveguide
(2017)We theoretically investigate the quantum scattering of a weak coherent input field interacting with an ensemble of Λtype threelevel atoms coupled to a onedimensional waveguide. With an effective nonHermitian Hamiltonian, ... 
A feasible strategy to balance the crystallinity and specific surface area of metal oxide nanocrystals
(2017)Practical, efficient synthesis of metal oxide nanocrystals with good crystallinity and high specific surface area by a modified polymernetwork gel method is demonstrated, taking ZnO nanocrystals as an example. A novel ... 
Pseudotopotactic conversion of carbon nanotubes to Tcarbon nanowires under picosecond laser irradiation in methanol
(2017)Pseudotopotactic conversion of carbon nanotubes into onedimensional carbon nanowires is a challenging but feasible path to obtain desired diameters and morphologies. Here, a previously predicted but experimentally ... 
Stabilizing Rabi oscillation of a charge qubit via the atomic clock technique
(2018)We propose a superconducting circuitatom hybrid, where the Rabi oscillation of single excess Cooper pair in the island is stabilized via the common atomic clock technique. The noise in the superconducting circuit is mapped ... 
Squeezing Enhances Quantum Synchronization
(2018)It is desirable to observe synchronization of quantum systems in the quantum regime, defined by the low number of excitations and a highly nonclassical steady state of the selfsustained oscillator. Several existing proposals ... 
Focus on atomtronicsenabled quantum technologies
(2017)Atomtronics is an emerging field in quantum technology that promises to realize ‘atomic circuit’ architectures exploiting ultracold atoms manipulated in versatile microoptical circuits generated by laser fields of different ... 
Theoretical description of a micromaser in the ultrastrongcoupling regime
(2017)We theoretically investigate an ultrastrongcoupled micromaser based on Rydberg atoms interacting with a superconducting LC resonator, where the common rotatingwave approximation and slowly varying envelope approximation ... 
Separability criteria with angular and Hilbert space averages
(2016)The practically useful criteria of separable states ρ=∑k wkρk in d=2×2 are discussed. The equality G(a,b)=4[〈ψP(a)⊗P(b)ψ〉−〈ψP(a)⊗1ψ〉〈ψ1⊗P(b)ψ〉]=0 for any two projection operators P(a) and P(b) provides a necessary ... 
Fast nonAbelian geometric gates via transitionless quantum driving
(20151221)A practical quantum computer must be capable of performing high fidelity quantum gates on a set of quantum bits (qubits). In the presence of noise, the realization of such gates poses daunting challenges. Geometric phases, ... 
GdN thin film: Chern insulating state on square lattice
(20151110)Using firstprinciples calculations, we predict a Chern insulating phase in thin films of the ferromagnetic semimetal GdN. In contrast to previously proposed Chern insulator candidates, which mostly rely on honeycomb ... 
Electronic structure of the antiferromagnetic topological insulator candidate GdBiPt
(20150615)We studied the electronic structures of antiferromagnetic (AFM) GdBiPt with propagating vectors Q1⃗ =(0,0,π) (Atype) and Q2⃗ =(π,π,π) (Gtype) by performing firstprinciples calculation based on densityfunctional theory ... 
Simulation and detection of photonic Chern insulators in a onedimensional circuitQED lattice
(20151012)We introduce a conceptually simple and experimentally feasible method to realize and detect photonic topological Chern insulators with a onedimensional circuit quantum electrodynamics lattice. By periodically modulating ... 
Halfskyrmion and vortexantivortex pairs in spinor condensates
(20150917)We propose a simple experimental scheme to generate spin textures in the ground state of interacting ultracold bosonic atoms loaded in a twodimensional harmonic trap. Our scheme is based on two copropagating LaguerreGauss ... 
Triangular and honeycomb lattices of cold atoms in optical cavities
(20151008)We consider a twodimensional homogeneous ensemble of cold bosonic atoms loaded inside two optical cavities and pumped by a fardetuned external laser field. We examine the conditions for these atoms to selforganize into ... 
Electronic Properties of Fluoride and Half–fluoride Superlattices KZnF3/KAgF3 and SrTiO3/KAgF3
(20151030)We present the formation of cupratelike electronic structures in KAgF3–related superlattices resulted from the confinement together with structural chemical modification by using the generalized gradient approximation ... 
Orbitaldependent ElectronHole Interaction in Graphene and Associated MultiLayer Structures
(20151127)We develop an orbitaldependent potential to describe electronhole interaction in materials with structural 2D character, i.e. quasi2D materials. The modulated orbitaldependent potentials are also constructed with ...