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Dive into the research topics where Mauro Iazzi is active.

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Featured researches published by Mauro Iazzi.


Physical Review Letters | 2014

Thermodynamics and magnetic properties of the anisotropic 3D Hubbard model.

Jakub Imriška; Mauro Iazzi; Lei Wang; Emanuel Gull; Daniel Greif; Thomas Uehlinger; Gregor Jotzu; Leticia Tarruell; Tilman Esslinger; Matthias Troyer

We study the anisotropic 3D Hubbard model with increased nearest-neighbor tunneling amplitudes along one direction using the dynamical cluster approximation and compare the results to a quantum simulation experiment of ultracold fermions in an optical lattice. We find that the short-range spin correlations are significantly enhanced in the direction with stronger tunneling amplitudes. Our results agree with the experimental observations and show that the experimental temperature is lower than the strong tunneling amplitude. We characterize the system by examining the spin correlations beyond neighboring sites and determine the distribution of density, entropy, and spin correlation in the trapped system. We furthermore investigate the dependence of the critical entropy at the Néel transition on anisotropy.


Physical Review B | 2015

Efficient Continuous-time Quantum Monte Carlo Method for the Ground State of Correlated Fermions

Lei Wang; Matthias Troyer; Mauro Iazzi; Philippe Corboz

We present the ground state extension of the efficient continuous-time quantum Monte Carlo algorithm for lattice fermions of M. Iazzi and M. Troyer, Phys. Rev. B 91, 241118 (2015). Based on continuous-time expansion of an imaginary-time projection operator, the algorithm is free of systematic error and scales linearly with projection time and interaction strength. Compared to the conventional quantum Monte Carlo methods for lattice fermions, this approach has greater flexibility and is easier to combine with powerful machinery such as histogram reweighting and extended ensemble simulation techniques. We discuss the implementation of the continuous-time projection in detail using the spinless t−V model as an example and compare the numerical results with exact diagonalization, density matrix renormalization group, and infinite projected entangled-pair states calculations. Finally we use the method to study the fermionic quantum critical point of spinless fermions on a honeycomb lattice and confirm previous results concerning its critical exponents.


Physical Review B | 2015

Efficient continuous-time quantum Monte Carlo algorithm for fermionic lattice models

Mauro Iazzi; Matthias Troyer

Efficient continuous time quantum Monte Carlo (CT-QMC) algorithms that do not suffer from time discretization errors have become the state-of-the-art for most discrete quantum models. They have not been widely used yet for fermionic quantum lattice models, such as the Hubbard model, due to a suboptimal scaling of


Physical Review B | 2010

Interference of Cooper pairs emitted from independent superconductors

Mauro Iazzi; Kazuya Yuasa

O(\beta^3)


EPL | 2012

Anisotropic Ginzburg-Landau and Lawrence-Doniach models for layered ultracold Fermi gases

Mauro Iazzi; S. Fantoni; Andrea Trombettoni

with inverse temperature


Molecular Physics | 2011

Vortex lines distribution in inhomogeneous lattices

Mauro Iazzi; Nicola Bassan; Andrea Trombettoni; K. E. Schmidt; S. Fantoni

\beta


International Journal of Quantum Information | 2011

INTERFERENCE OF AN ARRAY OF INDEPENDENT BOSE-EINSTEIN CONDENSATES WITH FIXED NUMBER OF ATOMS

Satoshi Ando; Kazuya Yuasa; Mauro Iazzi

, compared to the linear scaling of discrete time algorithms. Here we present a CT-QMC algorithms for fermionic lattice models that matches the scaling of discrete-time methods but is more efficient and free of time discretization errors. This provides an efficient simulation scheme that is free from the systematic errors opening an avenue to more precise studies of large systems at low temperatures.


Physical Review Letters | 2015

Split Orthogonal Group: A Guiding Principle for Sign-Problem-Free Fermionic Simulations.

Lei Wang; Ye-Hua Liu; Mauro Iazzi; Matthias Troyer; Gergely Harcos

We discuss the interference in the two-particle distribution of the electrons emitted from two independent superconductors. It is clarified that, while the interference appearing in the antibunching correlation is due to the Hanbury Brown and Twiss effect, that in the positive correlation due to superconductivity is intrinsically different and is nothing but the first-order interference of Cooper pairs emitted from different sources. This is the equivalent of the interference of two independent Bose-Einstein condensates.


Physical Review B | 2016

Topological origin of the fermion sign problem

Mauro Iazzi; Alexey A. Soluyanov; Matthias Troyer

We derive and study the anisotropic Ginzburg-Landau and Lawrence-Doniach models describing a layered superfluid ultracold Fermi gas in optical lattices. We compute from the microscopic model the Josephson couplings entering the Lawrence-Doniach model across the crossover BCS-BEC passing from the 3D isotropic case to the quasi-2D one, showing that a model with only nearest-neighbor Josephson couplings is not adequate at the unitary limit (since the pairs have a diameter larger than the interlayer distance). We also show that the effective anisotropy of the system is strongly reduced at the unitary limit. Finally, we obtain a relation between the interlayer Josephson couplings and the Ginzburg-Landau masses: we find that using only couplings between adjacent planes is correct in the BEC side, while at the unitary limit one has to use also next-nearest-neighboring couplings.


arXiv: Quantum Physics | 2014

Spontaneous Symmetry Breaking via Measurement: From Bose-Einstein Condensates to Josephson Effect

Takaaki Monnai; Mauro Iazzi; Kazuya Yuasa

We study the distribution of vortex lines in a three-dimensional lattice with inhomogeneous couplings. We investigate the spatial distribution of the number of vortex lines, showing how the vortex lines are expelled from the region with higher couplings. Results for the correlation functions are presented, together with a discussion of the implications of the obtained results for the vortex distribution in ultracold trapped gases and in neutron stars.

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S. Fantoni

International School for Advanced Studies

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Andrea Trombettoni

International School for Advanced Studies

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