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19 papers · 2 filters
Origin of destruction of multiferroicity in Tb2BaNiO5 by Sr doping and its implications
Ram Kumar, S. Rajput, T. Maitra +6
The orthorhombic Haldane spin chain compound Tb2BaNiO5 (Neel order, TN1= 63 K) has been shown to be an exotic multiferroic system below (TN2) 25 K due to various fascinating featur…
Evidence of non-trivial Berry phase and Kondo physics in SmBi
Anup Pradhan Sakhya, P. L. Paulose, A. Thamizhavel +1
Realization of semimetals with non-trivial topologies such as Dirac and Weyl semimetals, have provided a boost in the study of these quantum materials. Presence of electron correla…
Unwinding Fermionic SPT Phases: Supersymmetry Extension
Abhishodh Prakash, Juven Wang
We show how 1+1-dimensional fermionic symmetry-protected topological states (SPTs, i.e. nontrivial short-range entangled gapped phases of quantum matter whose boundary exhibits 't…
Boundary supersymmetry of 1+1 d fermionic SPT phases
Abhishodh Prakash, Juven Wang
We prove that the boundaries of all non-trivial 1+1 dimensional intrinsically fermionic symmetry-protected-topological phases, protected by finite on-site symmetries (unitary or an…
Probing signatures of fractionalization in candidate quantum spin liquid Cu2IrO3 via anomalous Raman scattering
Srishti Pal, Arnab Seth, Piyush Sakrikar +5
Long-range entanglement in quantum spin liquids (QSLs) lead to novel low energy excitations with fractionalised quantum numbers and (in 2D) statistics. Experimental detection and m…
Statistics tuned entanglement of the boundary modes in coupled Su-Schrieffer-Heeger chains
Saikat Santra, Adhip Agarwala, Subhro Bhattacharjee
We show that mutual statistics between quantum particles can be tuned to generate emergent novel few particle quantum mechanics for the boundary modes of symmetry-protected topolog…
-electron and magnetic ordering effects in nickelates LaNiO and NdNiO: remarkable role of the cuprate-like band
Ruiqi Zhang, Christopher Lane, Bahadur Singh +5
Recent discovery of superconductivity in the doped infinite-layer nickelates has renewed interest in understanding the nature of high-temperature superconductivity more generally.…
Quantum half-orphans in kagome antiferromagnets
Pranay Patil, Fabien Alet, Sylvain Capponi +1
We numerically study the effects of non-magnetic impurities (vacancies) in the spin- Heisenberg antiferromagnet on the kagomé lattice. For a range of low but nonzero temperature…
Gapless state of interacting Majorana fermions in a strain-induced Landau level
Adhip Agarwala, Subhro Bhattacharjee, Johannes Knolle +1
Mechanical strain can generate a pseudo-magnetic field, and hence Landau levels (LL), for low energy excitations of quantum matter in two dimensions. We study the collective state…
Non-equilibrium magnetic response of canonical spin glass and magnetic glass
Sudip Pal, Kranti Kumar, A. Banerjee +2
Time and history dependent magnetization has been observed in a wide variety of materials, which are collectively termed as the glassy magnetic systems. However, such systems showi…
Emergent moments and random singlet physics in a Majorana spin liquid
S. Sanyal, K. Damle, J. T. Chalker +1
We exhibit an exactly solvable example of a SU(2) symmetric Majorana spin liquid phase, in which quenched disorder leads to random-singlet phenomenology. More precisely, we argue t…
Phases and Quantum Phase Transitions in an Anisotropic Ferromagnetic Kitaev-Heisenberg- Magnet
Animesh Nanda, Kusum Dhochak, Subhro Bhattacharjee
We study the spin- ferromagnetic Heisenberg-Kitaev- model in the anisotropic (Toric code) limit to reveal the nature of the quantum phase transition between the gapped $Z_2…
Mixed ground state in Fe-Ni Invar alloys
S. S. Acharya, V. R. R. Medicherla, Komal Bapna +4
We investigate the ground state properties of Invar alloys via detailed study of the electronic structure of FeNi alloys ( = 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9) emplo…
Preparation, characterization and X-ray photoemission spectroscopy study of a correlated semimetal, SmBi
Anup Pradhan Sakhya, Arindam Pramanik, Ram Prakash Pandeya +4
We report high quality single crystalline growth of SmBi using flux method. The compound crystallizes in the simple rock salt structure with space group Fm3m. The cubic structure o…
Magnetic and transport anomalies in R2RhSi3 (R= Gd, Tb, and Dy), resembling those of an exotic magnetic skyrmion Gd2PdSi3
Ram Kumar, Kartik K Iyer, P. L. Paulose +1
We have carried out magnetization, heat capacity, electrical and magnetoresistance measurements (2-300 K) for the polycrystalline form of intermetallic compounds, R2RhSi3 (R= Gd, T…
Anisotropic Physical Properties of the Kondo Semimetal CeCuAs
Lukas Cvitkovich, Diego A. Zocco, Gaku Eguchi +6
The recently proposed novel materials class called Weyl-Kondo semimetal (WKSM) is a time reversal invariant but inversion symmetry broken Kondo semimetal in which Weyl nodes are pu…
Critical role of magnetic moments in heavy-fermion materials: revisiting mysteries of SmB
Ruiqi Zhang, Bahadur Singh, Christopher Lane +6
Heavy-fermion family exhibits fascinating and often puzzling properties due to the presence of open-shell ions and the complexity of the associated charge, orbital, and spin de…
Interplay of Magnetism and Topological Superconductivity in Bilayer Kagome Metals
Santu Baidya, Aabhaas Vineet Mallik, Subhro Bhattacharjee +1
The binary intermetallic materials, Sn ( = 3d transition metal) present a new class of strongly correlated systems that naturally allows for the interplay of magnetism…
Superconductor-like effects in an AC driven normal Mott-insulating quantum dot array
Sanjeev Kumar, Vikram Tripathi
We study the current response of an AC driven dissipative Mott insulator system, a normal quantum dot array, using an analytical Keldysh field theory approach. Deep in the Mott ins…