Browsing by Author "Strack, Philipp"
Now showing items 1-8 of 8
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Conserved Current Correlators of Conformal Field Theories in 2+1 Dimensions
Huh, Yejin; Strack, Philipp; Sachdev, Subir (American Physical Society (APS), 2013)We compute current correlators of the CPN−1 field theory in 2+1 dimensions, both at the critical point and in the phase with spontaneously broken SU(N) symmetry. Universal constants are obtained to next-to-leading order ... -
Dicke quantum spin glass of atoms and photons
Strack, Philipp; Sachdev, Subir (American Physical Society, 2011)Recent studies of strongly interacting atoms and photons in optical cavities have rekindled interest in the Dicke model of atomic qubits coupled to discrete photon cavity modes. We study the multimode Dicke model with ... -
Dicke-Model Quantum Spin and Photon Glass in Optical Cavities: Nonequilibrium Theory and Experimental Signatures
Buchhold, Michael; Strack, Philipp; Sachdev, Subir; Diehl, Sebastian (American Physical Society (APS), 2013)In the context of ultracold atoms in multimode optical cavities, the appearance of a quantum-critical glass phase of atomic spins has been predicted recently. Due to the long-range nature of the cavity-mediated interactions, ... -
Hyperscaling at the spin density wave quantum critical point in two-dimensional metals
Patel, Aavishkar Apoorva; Strack, Philipp; Sachdev, Subir (American Physical Society (APS), 2015)The hyperscaling property implies that spatially isotropic critical quantum states in d spatial dimensions have a specific heat which scales with temperature as Td/z, and an optical conductivity which scales with frequency ... -
Keldysh approach for nonequilibrium phase transitions in quantum optics: Beyond the Dicke model in optical cavities
Dalla Torre, Emanuele; Diehl, Sebastian; Lukin, Mikhail D.; Sachdev, Subir; Strack, Philipp (American Physical Society, 2013)We investigate non-equilibrium phase transitions for driven atomic ensembles, interacting with a cavity mode, coupled to a Markovian dissipative bath. In the thermodynamic limit and at low-frequencies, we show that the ... -
Multipoint Correlators of Conformal Field Theories: Implications for Quantum Critical Transport
Chowdhury, Debanjan; Raju, Suvrat; Sachdev, Subir; Singh, Ajay; Strack, Philipp (American Physical Society (APS), 2013)We compute three-point correlators between the stress-energy tensor and the conserved currents of conformal field theories (CFTs) in 2+1 dimensions. We first compute the correlators in the large-flavor-number expansion of ... -
Quantum Charge Glasses of Itinerant Fermions with Cavity-Mediated Long-Range Interactions
Müller, Markus; Strack, Philipp; Sachdev, Subir (American Physical Society, 2012)We study models of itinerant spinless fermions with random long-range interactions. We motivate such models from descriptions of fermionic atoms in multimode optical cavities. The solution of an infinite-range model yields ... -
Vector Boson Excitations Near Deconfined Quantum Critical Points
Huh, Yejin; Strack, Philipp; Sachdev, Subir (American Physical Society (APS), 2013)We show that the Néel states of two-dimensional antiferromagnets have low energy vector boson excitations in the vicinity of deconfined quantum critical points. We compute the universal damping of these excitations arising ...