694 citations · 987 across the 31 of their papers we have counts for
25 papers · 1 filter
Superconducting and charge-ordered phases from Dirac quantum spin liquids on the triangular lattice
Andreas Feuerpfeil, Ronny Thomale, Subir Sachdev +1
Triangular-lattice quantum spin-liquid insulators are observed to undergo transitions to superconductivity under pressure or doping, and exhibit enhanced terahertz conductivity whe…
Entanglement entropy of fermions in a strange metal
Santanu Singh, Surajit Bera, Chenyuan Li +2
The subsystem-size dependence of ground-state entanglement entropy and its crossover to thermal entropy as a function of temperature are well understood for one-dimensional (1D) ga…
From Ferrimagnetic Insulator to superconducting Luther-Emery Liquid: A DMRG Study of the Two-Leg Lieb Lattice
Alexander Nikolaenko, Subir Sachdev
Motivated by recent experiments on ultracold fermionic spin-1/2 Li atoms in a Lieb lattice at various Hubbard repulsion and filling fractions (Lebrat et al., arXiv:2404…
Superconductivity and fractionalized magnetic excitations in CeCoIn5
Pyeongjae Park, Shang-Shun Zhang, Pietro M. Bonetti +8
Recent experiments on CeCoIn5 -- a prototypical d-wave superconductor -- indicate that its normal state lies near an unconventional quantum critical point (QCP). One intriguing hyp…
Sondheimer magneto-oscillations as a probe of Fermi surface reconstruction in underdoped cuprates
Alexander Nikolaenko, Carsten Putzke, Philip J. W. Moll +2
Determining the Fermi surface (FS) volume in underdoped cuprates is crucial for understanding the nature of the strongly correlated pseudogap phase. Conventional quantum oscillatio…
Unifying Dirac Spin Liquids on Square and Shastry-Sutherland Lattices via Fermionic Deconfined Criticality
Andreas Feuerpfeil, Leyna Shackleton, Atanu Maity +3
We present a fermionic gauge theory for deconfined quantum criticality on the Shastry-Sutherland lattice and reveal its shared low-energy field-theoretic structure with the square…
Lectures on insulating and conducting quantum spin liquids
Subir Sachdev
Two of the iconic phases of the hole-doped cuprate materials are the intermediate temperature pseudogap metal and the lower temperature -wave superconductor. Following the sugge…
Steady-states and response functions of the periodically driven O(N) scalar field theory
Oriana K. Diessel, Subir Sachdev, Pietro M. Bonetti
We investigate the phase diagram of a relativistic, parametrically driven O()-symmetric theory coupled to a Markovian thermal bath. Our analysis reveals a rich variety of phases…
Fermionic spinon theory of the hourglass spin excitation spectrum of the cuprates
Alexander Nikolaenko, Pietro M. Bonetti, Subir Sachdev
We present a theory for the spin fluctuation spectrum of the hole-doped cuprates in a ground state with period 4 unidirectional charge density wave (`stripe') order. Motivated by r…
Superlinear Hall angle and carrier mobility from non-Boltzmann magnetotransport in the spatially disordered Yukawa-Sachdev-Ye-Kitaev model on a square lattice
Davide Valentinis, Jörg Schmalian, Subir Sachdev +1
Exact numerical results for the dc magnetoconductivity tensor of the two-dimensional spatially disordered Yukawa-Sachdev-Ye-Kitaev (2D-YSYK) model on a square lattice, at first ord…
Yamaji effect in models of underdoped cuprates
Jing-Yu Zhao, Shubhayu Chatterjee, Subir Sachdev +1
Recent angle-dependent magnetoresistance measurements in underdoped cuprates have revealed compelling evidence for small hole pockets in the pseudogap regime, including observation…
Fractionalized Fermi liquids and the cuprate phase diagram
Pietro M. Bonetti, Maine Christos, Alexander Nikolaenko +2
We review a theoretical framework for the cuprate superconductors, rooted in a fractionalized Fermi liquid (FL*) description of the intermediate-temperature pseudogap phase at low…
Thermal SU(2) lattice gauge theory for intertwined orders and hole pockets in the cuprates
Harshit Pandey, Maine Christos, Pietro M. Bonetti +3
The cuprate pseudogap phase displays Fermi arc spectral weight in photoemission and scanning tunneling microscopy (STM), while recent magnetotransport observations yield evidence f…
Thermopower across Fermi-volume-changing quantum phase transitions without translational symmetry breaking
Peter Lunts, Aavishkar A. Patel, Subir Sachdev
We describe the evolution of low-temperature thermopower across Fermi-volume-changing quantum phase transitions in Kondo lattice models without translational symmetry breaking. Thi…
Thermal Hall response of an abelian chiral spin liquid at finite temperatures
Avijit Maity, Haoyu Guo, Subir Sachdev +1
Thermal Hall transport has emerged as a valuable tool for probing the fractionalized excitations in chiral quantum spin liquids. Observing quantized thermal Hall response, expected…
Polaronic correlations from optimized ancilla wave functions for the Fermi-Hubbard model
Tobias Müller, Ronny Thomale, Subir Sachdev +1
We employ a family of ancilla qubit variational wave-functions [Zhang and Sachdev, Phys. Rev. Res. 2, 023172 (2020)] to describe the polaronic correlations in the pseudo-gap metal…
Vortex structure in a -wave superconductor obtained by a confinement transition from the pseudogap metal
Jia-Xin Zhang, Subir Sachdev
We compute the structure of flux vortices in a d-wave superconductor which emerges from a higher temperature pseudogap metal. Such a transition is described by a continuum…
Strange metal and superconductor in the two-dimensional Yukawa-Sachdev-Ye-Kitaev model
Chenyuan Li, Davide Valentinis, Aavishkar A. Patel +4
The two-dimensional Yukawa-Sachdev-Ye-Kitaev (2d-YSYK) model provides a universal theory of quantum phase transitions in metals in the presence of quenched random spatial fluctuati…
Quantum oscillations in the hole-doped cuprates and the confinement of spinons
Pietro M. Bonetti, Maine Christos, Subir Sachdev
A long standing problem in the study of the under-hole-doped cuprates has been the description of the Fermi surfaces underlying the high magnetic field quantum oscillations, and th…
Strong non-linear response of strange metals
Serhii Kryhin, Subir Sachdev, Pavel A. Volkov
We show that nonlinear transport responses in strange metals are strong, larger by a factor of than in Fermi liquids. Within the two-dimensional Yukawa-Sachdev-Ye-Kitaev mo…
Deconfined quantum criticality of nodal -wave superconductivity, Néel order, and charge order on the square lattice at half-filling
Maine Christos, Henry Shackleton, Subir Sachdev +1
We consider a SU(2) lattice gauge theory on the square lattice, with a single fundamental complex fermion and a single fundamental complex boson on each lattice site. Projective sy…
Sign-problem-free effective models of triangular lattice quantum antiferromagnets
Leyna Shackleton, Subir Sachdev
The triangular lattice antiferromagnet with spins and nearest neighbor interactions is known to have long-range antiferromagnetic order, with nearest-neighbor spins at an a…
Conductance and thermopower fluctuations in interacting quantum dots
Leyna Shackleton, Laurel E. Anderson, Philip Kim +1
We model an interacting quantum dot of electrons by a Hamiltonian with random and all-to-all single particle hopping (of r.m.s. strength ) and two-particle interactions (of r.m.…
Evolution of Quantum Fluctuations Near the Quantum Critical Point of the Transverse Field Ising Chain System CoNbO
A. W. Kinross, M. Fu, T. J. Munsie +4
The transverse field Ising chain (TFIC) model is ideally suited for testing the fundamental ideas of quantum phase transitions, because its well-known ground state can be ext…