Zobrazeno 1 - 10
of 476
pro vyhledávání: '"Dupuis, N P"'
Autor:
Dupuis, N., Canet, L., Eichhorn, A., Metzner, W., Pawlowski, J. M., Tissier, M., Wschebor, N.
Publikováno v:
Physics Reports 910, 1 (2021)
The renormalization group plays an essential role in many areas of physics, both conceptually and as a practical tool to determine the long-distance low-energy properties of many systems on the one hand and on the other hand search for viable ultravi
Externí odkaz:
http://arxiv.org/abs/2006.04853
Autor:
Daviet, R., Dupuis, N.
Publikováno v:
Phys. Rev. Lett. 122, 155301 (2019)
We study the quantum sine-Gordon model within a nonperturbative functional renormalization-group approach (FRG). This approach is benchmarked by comparing our findings for the soliton and lightest breather (soliton-antisoliton bound state) masses to
Externí odkaz:
http://arxiv.org/abs/1812.01908
Autor:
Debelhoir, T., Dupuis, N.
Publikováno v:
Phys. Rev. A 94, 053623 (2016)
We show that phase transitions in spin-one Bose gases and stacked triangular Heisenberg antiferromagnets -- an example of frustrated magnets with competing interactions -- are described by the same Landau-Ginzburg-Wilson Hamiltonian with O(3)$\times$
Externí odkaz:
http://arxiv.org/abs/1608.01817
Autor:
Debelhoir, T., Dupuis, N.
Publikováno v:
Phys. Rev. A 93, 051603(R) (2016)
Although there is a broad consensus on the fact that critical behavior in stacked triangular Heisenberg antiferromagnets --an example of frustrated magnets with competing interactions-- is described by a Landau-Ginzburg-Wilson Hamiltonian with O(3)$\
Externí odkaz:
http://arxiv.org/abs/1512.02024
Autor:
Debelhoir, T., Dupuis, N.
Publikováno v:
Phys. Rev. A 93, 023642 (2016)
We determine the size of the critical region of the superfluid transition in the BCS-BEC crossover of a three-dimensional fermion gas, using a renormalization-group approach to a bosonic theory of pairing fluctuations. For the unitary Fermi gas, we f
Externí odkaz:
http://arxiv.org/abs/1507.02818
Publikováno v:
Phys. Rev. E 90, 062105 (2014)
We reexamine the two-dimensional linear O(2) model ($\varphi^4$ theory) in the framework of the nonperturbative renormalization-group. From the flow equations obtained in the derivative expansion to second order and with optimization of the infrared
Externí odkaz:
http://arxiv.org/abs/1409.1374
Autor:
Rancon, A., Dupuis, N.
Publikováno v:
Phys. Rev. B 89, 180501(R) (2014)
We study the "Higgs" amplitude mode in the relativistic quantum O($N$) model in two space dimensions. Using the nonperturbative renormalization group we compute the O($N$)-invariant scalar susceptibility in the vicinity of the zero-temperature quantu
Externí odkaz:
http://arxiv.org/abs/1402.3098
Autor:
Dupuis, N.
Publikováno v:
Phys. Rev. B 89, 035113 (2014)
We propose a nonperturbative renormalization-group (NPRG) approach to fermion systems in the two-particle-irreducible (2PI) effective action formalism, based on an exact RG equation for the Luttinger-Ward functional. This approach enables us to descr
Externí odkaz:
http://arxiv.org/abs/1310.4979
Autor:
Rancon, A., Dupuis, N.
Publikováno v:
Europhys. Lett. 104, 16002 (2013)
We derive the equation of state of a two-dimensional Bose gas in an optical lattice in the framework of the Bose-Hubbard model. We focus on the vicinity of the multicritical points where the quantum phase transition between the Mott insulator and the
Externí odkaz:
http://arxiv.org/abs/1307.3436
Publikováno v:
Phys. Rev. E 88, 012113 (2013)
We study the thermodynamics of the relativistic quantum O($N$) model in two space dimensions. In the vicinity of the zero-temperature quantum critical point (QCP), the pressure can be written in the scaling form $P(T)=P(0)+N(T^3/c^2)\calF_N(\Delta/T)
Externí odkaz:
http://arxiv.org/abs/1303.6559