T. Senthil
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View article: Expert Evaluation of LLM World Models: A High-$T_c$ Superconductivity Case Study
Expert Evaluation of LLM World Models: A High-$T_c$ Superconductivity Case Study Open
Large Language Models (LLMs) show great promise as a powerful tool for scientific literature exploration. However, their effectiveness in providing scientifically accurate and comprehensive answers to complex questions within specialized d…
View article: Unusual critical points between atomic insulating phases
Unusual critical points between atomic insulating phases Open
We study a class of quantum phase transitions between featureless bosonic atomic insulators in $(2+1)$ dimensions, where each phase exhibits neither topological order nor protected edge modes. Despite their lack of topology, these insulato…
View article: Emergent QED$_3$ at the bosonic Laughlin state to superfluid transition
Emergent QED$_3$ at the bosonic Laughlin state to superfluid transition Open
Quantum phase transitions between topologically ordered and symmetry-broken phases lie beyond Landau theory. A prime example is the conjectured continuous transition from the bosonic $ν= 1/2$ Laughlin state to a superfluid, proposed to be …
View article: Higgs-mode electromagnon in the spin-spiral multiferroic CuBr${}_2$
Higgs-mode electromagnon in the spin-spiral multiferroic CuBr${}_2$ Open
Below a continuous symmetry breaking phase transition, the relevant collective excitations are due to longitudinal and transverse fluctuations of the order parameter, which are referred to as Higgs and Goldstone modes, respectively. In sol…
View article: Possible nodal superconducting pairing in magic angle twisted graphene layers
Possible nodal superconducting pairing in magic angle twisted graphene layers Open
View article: Elastic Response and Instabilities of Anomalous Hall Crystals
Elastic Response and Instabilities of Anomalous Hall Crystals Open
Anomalous Hall crystals (AHCs) are exotic phases of matter that simultaneously break continuous translation symmetry and exhibit the quantum anomalous Hall effect. AHCs have recently been proposed as an explanation for the observation of a…
View article: Dirac spin liquid as an “unnecessary” quantum critical point on square lattice antiferromagnets
Dirac spin liquid as an “unnecessary” quantum critical point on square lattice antiferromagnets Open
Quantum spin liquids are exotic phases of quantum matter especially pertinent to many modern condensed matter systems. Dirac spin liquids (DSLs) are a class of gapless quantum spin liquids that do not have a quasi-particle description and …
View article: Unconventional superconductivity mediated by exciton density wave fluctuations
Unconventional superconductivity mediated by exciton density wave fluctuations Open
Synthetic platforms afford an unparalleled degree of controllability in realizing strongly-correlated phases of matter. In this work, we study the possibility of electrically tunable exciton-mediated superconductivity arising in charge-imb…
View article: Doping a fractional quantum anomalous Hall insulator
Doping a fractional quantum anomalous Hall insulator Open
We study novel itinerant phases that can be accessed by doping a fractional quantum anomalous Hall (FQAH) insulator, with a focus on the experimentally observed Jain states at lattice filling $ν= p/(2p+1)$. Unlike in the lowest Landau leve…
View article: Observable signatures of Hall viscosity in lowest Landau level superfluids
Observable signatures of Hall viscosity in lowest Landau level superfluids Open
Hall viscosity is a nondissipative viscosity occurring in systems with broken time-reversal symmetry, such as quantum Hall phases and $p+ip$ superfluids. Despite Hall viscosity's expected ubiquity and past observations in: classical soft m…
View article: Dirac spin liquid as an "unnecessary" quantum critical point on square lattice antiferromagnets
Dirac spin liquid as an "unnecessary" quantum critical point on square lattice antiferromagnets Open
Quantum spin liquids are exotic phases of quantum matter especially pertinent to many modern condensed matter systems. Dirac spin liquids (DSLs) are a class of gapless quantum spin liquids that do not have a quasi-particle description and …
View article: Stability of Anomalous Hall Crystals in multilayer rhombohedral graphene
Stability of Anomalous Hall Crystals in multilayer rhombohedral graphene Open
Recent experiments showing an integer quantum anomalous Hall effect in pentalayer rhombohedral graphene have been interpreted in terms of a valley-polarized interaction-induced Chern band. The resulting many-body state can be viewed as an …
View article: Symmetries without an inverse: An illustration through the 1+1-D Ising model
Symmetries without an inverse: An illustration through the 1+1-D Ising model Open
Symmetries provide a powerful tool to organize our understanding of physics.In recent years, the notion of symmetry in quantum many body systems/field theory has been generalized in many interesting ways, resulting in a unified perspective…
View article: Excitonic quantum criticality: from bilayer graphene to narrow Chern bands
Excitonic quantum criticality: from bilayer graphene to narrow Chern bands Open
We study a family of excitonic quantum phase transitions describing the evolution of a bilayer metallic state to an inter-layer coherent state where excitons condense. We argue that such transitions can be continuous and exhibit a non-Ferm…
View article: Density wave halo around anyons in fractional quantum anomalous hall states
Density wave halo around anyons in fractional quantum anomalous hall states Open
The recent observation of fractional quantum anomalous Hall (FQAH) states in tunable moiré materials encourages study of several new phenomena that may be uniquely accessible in these platforms. Here, we show that an isolated localized any…
View article: Theory of quantum anomalous Hall phases in pentalayer rhombohedral graphene moiré structures
Theory of quantum anomalous Hall phases in pentalayer rhombohedral graphene moiré structures Open
Remarkable recent experiments on the moiré structure formed by pentalayer rhombohedral graphene aligned with a hexagonal Boron-Nitride substrate report the discovery of a zero field fractional quantum hall effect. These "(Fractional) Quant…
View article: Observable signatures of Hall viscosity in lowest Landau level superfluids
Observable signatures of Hall viscosity in lowest Landau level superfluids Open
Hall viscosity is a nondissipative viscosity occurring in systems with broken time-reversal symmetry, such as quantum Hall phases and $p+ip$ superfluids. Despite Hall viscosity's expected ubiquity and past observations in: classical soft m…
View article: Phase transitions out of quantum Hall states in moiré materials
Phase transitions out of quantum Hall states in moiré materials Open
Motivated by the recent experimental breakthroughs in observing Fractional Quantum Anomalous Hall (FQAH) states in moiré materials, we propose and study various unconventional phase transitions between quantum Hall phases and Fermi liquids…
View article: Non-Fermi Liquids from Kinetic Constraints in Tilted Optical Lattices
Non-Fermi Liquids from Kinetic Constraints in Tilted Optical Lattices Open
We study Fermi-Hubbard models with kinetically constrained dynamics that conserves both total particle number and total center of mass, a situation that arises when interacting fermions are placed in strongly tilted optical lattices. Throu…
View article: Deconfined quantum critical points: a review
Deconfined quantum critical points: a review Open
Continuous phase transitions in equilibrium statistical mechanics were successfully described 50 years ago with the development of the renormalization group framework. This framework was initially developed in the context of phase transiti…
View article: Dipole condensates in tilted Bose-Hubbard chains
Dipole condensates in tilted Bose-Hubbard chains Open
Here we study the quantum phase diagram of a Bose-Hubbard chain whose dynamics conserves both a boson number and boson dipole moment, a situation which can arise in strongly tilted optical lattices. The conservation of the dipole moment ha…
View article: Loop current fluctuations and quantum critical transport
Loop current fluctuations and quantum critical transport Open
We study electrical transport at quantum critical points (QCPs) associated with loop current ordering in a metal, focusing specifically on models of the “Hertz-Millis” type. At the infrared (IR) fixed point and in the absence of disorder, …
View article: Continuous Mott Transition in Moiré Semiconductors: Role of Long-Wavelength Inhomogeneities
Continuous Mott Transition in Moiré Semiconductors: Role of Long-Wavelength Inhomogeneities Open
Recent experiments in moiré transition metal dichalcogenide materials have reported the observation of a continuous bandwidth-tuned transition from a metal to a paramagnetic Mott insulator at a fixed filling of one electron per moiré unit …
View article: Metal to Wigner-Mott insulator transition in two-leg ladders
Metal to Wigner-Mott insulator transition in two-leg ladders Open
Here we study theoretically the quantum phase transition from a metal to a Wigner-Mott insulator at fractional commensurate filling on a two-leg ladder. We show that a continuous transition out of a symmetry-preserving Luttinger liquid met…
View article: Report on 2208.04328v1
Report on 2208.04328v1 Open
We study electrical transport at quantum critical points (QCPs) associated with loop current ordering in a metal, focusing specifically on models of the "Hertz-Millis" type.At the infrared (IR) fixed point and in the absence of disorder, t…
View article: Report on 2208.04328v1
Report on 2208.04328v1 Open
We study electrical transport at quantum critical points (QCPs) associated with loop current ordering in a metal, focusing specifically on models of the "Hertz-Millis" type.At the infrared (IR) fixed point and in the absence of disorder, t…
View article: Gifts from anomalies: Exact results for Landau phase transitions in metals
Gifts from anomalies: Exact results for Landau phase transitions in metals Open
Non-Fermi liquid phenomena arise naturally near critical points of Landau ordering transitions in metallic systems, where strong fluctuations of a bosonic order parameter destroy coherent quasiparticles. Despite progress in developing cont…
View article: Report on 2208.04328v1
Report on 2208.04328v1 Open
We study electrical transport at quantum critical points (QCPs) associated with loop current ordering in a metal, focusing specifically on models of the "Hertz-Millis" type.At the infrared (IR) fixed point and in the absence of disorder, t…
View article: Theory of a continuous bandwidth-tuned Wigner-Mott transition
Theory of a continuous bandwidth-tuned Wigner-Mott transition Open
Here we develop a theory for a continuous bandwidth-tuned transition at fixed fractional electron filling from a metal with a generic Fermi surface to a “Wigner-Mott” insulator that spontaneously breaks crystalline space-group symmetries. …
View article: Pairing symmetry of twisted bilayer graphene: A phenomenological synthesis
Pairing symmetry of twisted bilayer graphene: A phenomenological synthesis Open
One of the outstanding questions in the study of twisted bilayer graphene—from both experimental and theoretical points of view—is the nature of its superconducting phase. In this paper we perform a comprehensive synthesis of existing expe…