Dror Orgad
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View article: Trimer superfluidity of antiparallel dipolar excitons in a bilayer heterostructure
Trimer superfluidity of antiparallel dipolar excitons in a bilayer heterostructure Open
We study the phase diagram of a bilayer of antiparallel dipolar excitons with a 1:2 density ratio between the layers, as a function of temperature and density. Using quantum Monte Carlo simulations, we show that such a system supports the …
View article: Disorder effects in a model of competing superconducting and charge-density wave orders in YBa$_2$Cu$_3$O$_{6+x}$
Disorder effects in a model of competing superconducting and charge-density wave orders in YBa$_2$Cu$_3$O$_{6+x}$ Open
There is evidence for competition between superconductivity and short-range charge-density wave order in a number of cuprate compounds and especially in YBa$_2$Cu$_3$O$_{6+x}$. Here, we use a non-linear sigma model of such competition to s…
View article: Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa$_{2}$Cu$_{3}$O$_{\rm{y}}$
Using strain to uncover the interplay between two- and three-dimensional charge density waves in high-temperature superconducting YBa$_{2}$Cu$_{3}$O$_{\rm{y}}$ Open
Uniaxial pressure provides an efficient approach to control the competition between charge density waves (CDWs) and superconductivity in underdoped YBa$_{2}$Cu$_{3}$O$_{\rm{y}}$. It can enhance the correlation volume of ubiquitous short-ra…
View article: Quantum Monte Carlo study of a bilayer $U(2)\times U(2)$ symmetric Hubbard model
Quantum Monte Carlo study of a bilayer $U(2)\times U(2)$ symmetric Hubbard model Open
We carry out a sign-problem-free quantum Monte Carlo calculation of a bilayer model with a repulsive intra-layer Hubbard interaction and a ferromagnetic inter-layer interaction. The latter breaks the global $SU(2)$ spin rotational symmetry…
View article: Dynamical transitions from slow to fast relaxation in random open quantum systems
Dynamical transitions from slow to fast relaxation in random open quantum systems Open
We explore the effects of spatial locality on the dynamics of random quantum systems subject to a Markovian noise. To this end, we study a model in which the system Hamiltonian and its couplings to the noise are random matrices whose entri…
View article: Spectral Gaps and Midgap States in Random Quantum Master Equations
Spectral Gaps and Midgap States in Random Quantum Master Equations Open
We discuss the decay rates of chaotic quantum systems coupled to noise. We model both the Hamiltonian and the system-noise coupling by random N×N Hermitian matrices, and study the spectral properties of the resulting Liouvillian superopera…
View article: Confinement transition in a Kitaev-like honeycomb model with bond anisotropy
Confinement transition in a Kitaev-like honeycomb model with bond anisotropy Open
The honeycomb $K-\\Gamma$ model is known to have both deconfined spin liquid\nand confined phases. We study here a confinement transition between the Kitaev\nspin liquid and a dimerized phase in the limit of strong bond anisotropy. By\npar…
View article: Dimensional Crossover of Charge-Density Wave Correlations in the Cuprates
Dimensional Crossover of Charge-Density Wave Correlations in the Cuprates Open
Short-range charge-density wave correlations are ubiquitous in underdoped cuprates. They are largely confined to the copper-oxygen planes and typically oscillate out of phase from one unit cell to the next in the c direction. Recently, it …
View article: Optimal inhomogeneity for pairing in Hubbard systems with next-nearest-neighbor hopping
Optimal inhomogeneity for pairing in Hubbard systems with next-nearest-neighbor hopping Open
Previous studies have shown that bipartite Hubbard systems with inhomogeneous hopping amplitudes can exhibit higher pair-binding energies than the uniform model. Here we examine whether this result holds for systems with a more generic ban…
View article: Transverse thermoelectric response as a probe for existence of quasiparticles
Transverse thermoelectric response as a probe for existence of quasiparticles Open
The electrical Hall conductivities of any anisotropic interacting system with\nreflection symmetry obey sigma_{xy} = - sigma_{yx}. In contrast, we show that\nthe analogous relation between the transverse thermoelectric Peltier\ncoefficient…