Subhro Bhattacharjee
Tata Institute of Fundamental Research
Quantum spin liquidSpinonPhysicsTopologyLattice (order)Phase transitionAntiferromagnetismStrongly correlated materialGauge theoryMaterials scienceMean field theoryGapless playbackCondensed matter physicsU-1MAJORANAIsing modelSpin (physics)Quantum mechanicsGround stateQuantum phase transitionSpin-½QuantumPhase diagramScaling
67Publications
17H-index
1,764Citations
Publications 65
Newest
#1Srishti Pal (IISc: Indian Institute of Science)H-Index: 2
#2Arnab Seth (TIFR: Tata Institute of Fundamental Research)H-Index: 1
Last. A. K. Sood (IISc: Indian Institute of Science)H-Index: 15
view all 8 authors...
Source
#1Animesh Nanda (TIFR: Tata Institute of Fundamental Research)H-Index: 1
#2Adhip Agarwala (MPG: Max Planck Society)H-Index: 7
Last. Subhro Bhattacharjee (TIFR: Tata Institute of Fundamental Research)H-Index: 17
view all 3 authors...
Source
#1Sugan D. MuruganH-Index: 2
#2Dheeraj KumarH-Index: 1
Last. Samriddhi Sankar RayH-Index: 18
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We use a new measure of many-body chaos for classical systems---cross-correlators---to show that in a thermalised fluid (obtained from a non-linear, prototypical equation of hydrodynamics sharing formal similarities with models of turbulence) characterised by a temperature Tand N_Gdegrees of freedom, the Lyapunov exponent \lambdascales as N_G\sqrt{T} This bound, obtained from detailed numerical simulations and theoretical estimates, provides compelling evidence not only for recent co...
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#1Animesh NandaH-Index: 1
#2Adhip Agarwala (MPG: Max Planck Society)H-Index: 7
Last. Subhro BhattacharjeeH-Index: 17
view all 3 authors...
We study the Kitaev-Heisenberg-\Gammamodel with antiferromagnetic Kitaev exchanges in the strong anisotropic (toric code) limit to understand the phases and the intervening phase transitions between the gapped Z_2quantum spin liquid and the spin-ordered (in the Heisenberg limit) as well as paramagnetic phases (in the pseudo-dipolar, \Gamma limit). We find that the paramagnetic phase obtained in the large \Gammalimit has no topological entanglement entropy and is proximate to a gaples...
#1Saikat SantraH-Index: 1
#2Adhip AgarwalaH-Index: 7
Last. Subhro BhattacharjeeH-Index: 17
view all 3 authors...
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 topological phases of matter. As a concrete setting, we study a system of pseudofermions, defined as quantum particles with tunable algebra, which lie on two distinct Su-Schrieffer-Heeger (SSH) chains. We find that as the mutual statistics of the particles are tuned -- the boundary modes present in the two chains gets non-tri...
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We study correlations, transport and chaos in a Heisenberg magnet as a classical model many-body system. By varying temperature and dimensionality, we can tune between settings with and without symmetry breaking and accompanying collective modes or quasiparticles. We analyse both conventional and out-of-time-ordered spin correlators (`decorrelators') to track the spreading of a spatiotemporally localised perturbation -- the wingbeat of the butterfly -- as well as transport coefficients and Lyapu...
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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 of the fractionalised Majorana fermions arising from residual generic spin interactions in the central LL, where the projected Hamiltonian reflects the spin symmetries in intricate ways: emergent U(1) and particle-hole symmetries forbid any bilinear couplings, leading to an intrinsically strongly interacting system; al...
Source
#1Akmal HossainH-Index: 1
#2S. KunduH-Index: 5
Last. D. D. SarmaH-Index: 86
view all 14 authors...
#1Animesh NandaH-Index: 1
#2Kusum Dhochak (IITs: Indian Institutes of Technology)H-Index: 1
Last. Subhro BhattacharjeeH-Index: 17
view all 3 authors...
We study the spin-1/2ferromagnetic Heisenberg-Kitaev-\Gammamodel in the anisotropic (Toric code) limit to reveal the nature of the quantum phase transition between the gapped Z_2quantum spin liquid and a spin ordered phase (driven by Heisenberg interactions) as well as a trivial paramagnet (driven by pseudo-dipolar interactions, \Gamma. The transitions are obtained by a simultaneous condensation of the Ising electric and magnetic charges-- the fractionalized excitations of the Z_2...
Source
#1Srishti PalH-Index: 2
#2Arnab SethH-Index: 1
Last. A. K. SoodH-Index: 15
view all 8 authors...
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 manipulation of these excitations present a challenge particularly in view of diverse candidate magnets. A promising probe of fractionalisation is their coupling to phonons. Here we present Raman scattering results for the S = 1/2 honeycomb iridate Cu2IrO3, a candidate Kitaev QSL with fractionalised Majorana fermions an...
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