Koenraad Schalm
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View article: Going Dutch: Jan Zaanen and the strange metals consortium
Going Dutch: Jan Zaanen and the strange metals consortium Open
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View article: Natural anomalous cyclotron response in a hydrodynamic local quantum critical metal in a periodic potential
Natural anomalous cyclotron response in a hydrodynamic local quantum critical metal in a periodic potential Open
We study DC magnetotransport in a quantum critical metal in the presence of a lattice. In the regime where the transport is hydrodynamical the interplay of the Lorentz force and the lattice gives rise to a natural anomalous contribution to…
View article: Hydrodynamics of a relativistic charged fluid in the presence of a periodically modulated chemical potential
Hydrodynamics of a relativistic charged fluid in the presence of a periodically modulated chemical potential Open
We study charged hydrodynamics in a periodic lattice background. Fluctuations are Bloch waves rather than single momentum Fourier modes. At boundaries of the unit cell where hydrodynamic fluctuations are formally degenerate with their Umkl…
View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>T</mml:mi></mml:math>-linear resistivity, optical conductivity, and Planckian transport for a holographic local quantum critical metal in a periodic potential
-linear resistivity, optical conductivity, and Planckian transport for a holographic local quantum critical metal in a periodic potential Open
High-Tc cuprate strange metals are characterized by a DC resistivity that scales linearly with T from the onset of superconductivity to the crystal melting temperature, characterized by a current lif…
View article: Report on 2303.17685v2
Report on 2303.17685v2 Open
We study charged hydrodynamics in a periodic lattice background.Fluctuations are Bloch waves rather than single momentum Fourier modes.At boundaries of the unit cell where hydrodynamic fluctuations are formally degenerate with their Umklap…
View article: Report on scipost_202304_00008v1
Report on scipost_202304_00008v1 Open
We study charged hydrodynamics in a periodic lattice background.Fluctuations are Bloch waves rather than single momentum Fourier modes.At boundaries of the unit cell where hydrodynamic fluctuations are formally degenerate with their Umklap…
View article: Report on scipost_202304_00008v1
Report on scipost_202304_00008v1 Open
We study charged hydrodynamics in a periodic lattice background.Fluctuations are Bloch waves rather than single momentum Fourier modes.At boundaries of the unit cell where hydrodynamic fluctuations are formally degenerate with their Umklap…
View article: Energy dynamics, information and heat flow in quenched cooling and the crossover from quantum to classical thermodynamics
Energy dynamics, information and heat flow in quenched cooling and the crossover from quantum to classical thermodynamics Open
View article: Replicating Higgs fields in Ising gauge theory: the registry order
Replicating Higgs fields in Ising gauge theory: the registry order Open
We consider $Z_2$ gauge field theory coupled to "Higgs" matter fields invoking several copies of such matter, interacting entirely through the gauge fields, the $Z_2 \times Z_2 \times Z_2\cdots / Z_2$ and the $O(N) \times O(N) \times O(N) …
View article: Criticality versus uniformity in deep neural networks
Criticality versus uniformity in deep neural networks Open
Deep feedforward networks initialized along the edge of chaos exhibit exponentially superior training ability as quantified by maximum trainable depth. In this work, we explore the effect of saturation of the tanh activation function along…
View article: Hydrodynamics of a relativistic charged fluid in the presence of a periodically modulated chemical potential
Hydrodynamics of a relativistic charged fluid in the presence of a periodically modulated chemical potential Open
We study charged hydrodynamics in a periodic lattice background. Fluctuations are Bloch waves rather than single momentum Fourier modes. At boundaries of the unit cell where hydrodynamic fluctuations are formally degenerate with their Umkl…
View article: Quantization and variational problem of the Gubser-Rocha Einstein-Maxwell-Dilaton model, conformal and non-conformal deformations, and its proper thermodynamics
Quantization and variational problem of the Gubser-Rocha Einstein-Maxwell-Dilaton model, conformal and non-conformal deformations, and its proper thermodynamics Open
A bstract We show that the strongly coupled field theory holographically dual to the Gubser-Rocha anti-de-Sitter Einstein-Maxwell-Dilaton theory describes not a single non-trivial AdS 2 IR fixed point, but a one-parameter family. It is dua…
View article: T-linear resistivity, optical conductivity and Planckian transport for a holographic local quantum critical metal in a periodic potential
T-linear resistivity, optical conductivity and Planckian transport for a holographic local quantum critical metal in a periodic potential Open
High $T_c$ cuprate strange metals are noted for a DC-resistivity that scales linearly with $T$ from the onset of superconductivity to the crystal melting temperature, indicative of a Planckian dissipation life time $τ_{\hbar}\simeq \hbar /…
View article: Quantization and variational problem of the Gubser-Rocha Einstein-Maxwell-Dilaton model, conformal and non-conformal deformations, and its proper thermodynamics
Quantization and variational problem of the Gubser-Rocha Einstein-Maxwell-Dilaton model, conformal and non-conformal deformations, and its proper thermodynamics Open
We show that the strongly coupled field theory holographically dual to the Gubser-Rocha anti-de-Sitter Einstein-Maxwell-Dilaton theory describes not a single non-trivial AdS$_2$ IR fixed point, but a one-parameter family. It is dual to a l…
View article: Emerging Fermi liquids from regulated quantum electron stars
Emerging Fermi liquids from regulated quantum electron stars Open
View article: Quantum critical Eliashberg theory, the Sachdev-Ye-Kitaev superconductor and their holographic duals
Quantum critical Eliashberg theory, the Sachdev-Ye-Kitaev superconductor and their holographic duals Open
View article: Emerging Fermi liquids from regulated Quantum Electron Stars
Emerging Fermi liquids from regulated Quantum Electron Stars Open
We construct a fully quantum zero-temperature electron star in a soft-wall regulated anti-de-Sitter Einstein-Maxwell-Dirac theory that is thermodynamically stable compared to the Reissner-Nordström black hole. The soft wall only acts on th…
View article: Information to energy conversion in quantum composite systems at finite temperature
Information to energy conversion in quantum composite systems at finite temperature Open
It is known that entanglement can be converted to work in quantum composite systems. In this paper we consider a quench protocol for two initially independent reservoirs $A$ and $B$ described by the quantum thermal states. For a free fermi…
View article: Quantum tunneling dynamics in a complex-valued Sachdev-Ye-Kitaev model quench-coupled to a cool bath
Quantum tunneling dynamics in a complex-valued Sachdev-Ye-Kitaev model quench-coupled to a cool bath Open
The Sachdev-Ye-Kitaev (SYK) model describes interacting fermionic zero modes\nin zero spatial dimensions, e.g. quantum dot, with interactions strong enough\nto completely washout quasiparticle excitations in the infrared. In this paper,\nw…
View article: Quantum critical Eliashberg theory, the SYK superconductor and their holographic duals
Quantum critical Eliashberg theory, the SYK superconductor and their holographic duals Open
Superconductivity is abundant near quantum-critical points, where fluctuations suppress the formation of Fermi liquid quasiparticles and the BCS theory no longer applies. Two very distinct approaches have been developed to address this iss…
View article: Quantum tunneling dynamics in complex SYK model quenched-coupled to a cool-bath
Quantum tunneling dynamics in complex SYK model quenched-coupled to a cool-bath Open
The Sachdev-Ye-Kitaev (SYK) model describes interacting fermionic zero modes in zero spatial dimensions, e.g. quantum dot, with interactions strong enough to completely washout quasiparticle excitations in the infrared. In this note, we co…
View article: Isolated zeros destroy Fermi surface in holographic models with a lattice
Isolated zeros destroy Fermi surface in holographic models with a lattice Open
View article: Operator thermalization vs eigenstate thermalization
Operator thermalization vs eigenstate thermalization Open
We study the characteristics of thermalizing and non-thermalizing operators in integrable theories as we turn on a non-integrable deformation. Specifically, we show that $σ^z$, an operator that thermalizes in the integrable transverse fiel…
View article: Anomalous attenuation of plasmons in strange metals and holography
Anomalous attenuation of plasmons in strange metals and holography Open
The plasmon is a ubiquitous collective mode in charged liquids. Due to the long-range Coulomb interaction, the massless zero sound mode of the neutral system acquires a finite plasmon frequency in the long-wavelength limit. In the zero-tem…
View article: Thermalization/Relaxation in integrable and free field theories: an\n Operator Thermalization Hypothesis
Thermalization/Relaxation in integrable and free field theories: an\n Operator Thermalization Hypothesis Open
Free or integrable theories are usually considered to be too constrained to\nthermalize. For example, the retarded two-point function of a free field, even\nin a thermal state, does not decay to zero at long times. On the other hand,\nthe …
View article: Thermalization/Relaxation in integrable and free field theories: an Operator Thermalization Hypothesis
Thermalization/Relaxation in integrable and free field theories: an Operator Thermalization Hypothesis Open
Free or integrable theories are usually considered to be too constrained to thermalize. For example, the retarded two-point function of a free field, even in a thermal state, does not decay to zero at long times. On the other hand, the mag…
View article: Isolated zeros in the spectral function as signature of a quantum continuum
Isolated zeros in the spectral function as signature of a quantum continuum Open
We study the observable properties of quantum systems which involve a quantum continuum as a subpart. We show in a very general way that in any system, which consists of at least two isolated states coupled to a continuum, the spectral fun…
View article: Kinetic theory for classical and quantum many-body chaos
Kinetic theory for classical and quantum many-body chaos Open
For perturbative scalar field theories, the late-time-limit of the out-of-time-ordered correlation function that measures (quantum) chaos is shown to be equal to a Boltzmann-type kinetic equation that measures the total gross (instead of n…
View article: Isolated zeros in the spectral function as signature of a quantum critical continuum
Isolated zeros in the spectral function as signature of a quantum critical continuum Open
We study the observable properties of quantum systems which involve a quantum critical continuum as a subpart. We show in a very general way that in any system, which consists of at least two isolated states coupled to a continuum, the spe…
View article: A Cardy formula for off-diagonal three-point coefficients; or, how the geometry behind the horizon gets disentangled
A Cardy formula for off-diagonal three-point coefficients; or, how the geometry behind the horizon gets disentangled Open
A bstract In the AdS/CFT correspondence eternal black holes can be viewed as a specific entanglement between two copies of the CFT: the thermofield double. The statistical CFT Wightman function can be computed from a geodesic between the t…