96 citations · 600 across the 37 of their papers we have counts for
37 papers
Equal-spin and opposite-spin density-density correlations in the BCS-BEC crossover: Gauge Symmetry, Pauli Exclusion Principle, Wick's Theorem and Experiments
Nikolai Kaschewski, Axel Pelster, Carlos A. R. Sá de Melo
We develop a general theory of spin-dependent density-density correlations, that is valid for any temperature, interactions, dimensions and mass or population status of Fermi gases…
Topological two-band electron-hole superconductors with -wave symmetry: Absence of Dirac quasiparticle annihilation in magic-angle twisted trilayer graphene
Senne Van Loon, Carlos A. R. Sa de Melo
We discuss a two-band model for two-dimensional superconductors with electron and hole bands separated by an energy gap and singlet -wave pairing in each band. This type of mode…
Superfluid transition temperature and fluctuation theory of spin-orbit and Rabi-coupled fermions with tunable interactions
Philip D. Powell, Gordon Baym, Carlos Sa de Melo
We obtain the superfluid transition temperature of equal Rashba-Dresselhaus spin-orbit and Rabi-coupled Fermi superfluids, from the Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein…
Effects of quantum fluctuations on the low-energy collective modes of two-dimensional superfluid Fermi gases from the BCS to the Bose Limit
Senne Van Loon, Carlos A. R. Sá de Melo
We investigate the effects of quantum fluctuations on the low-energy collective modes of two-dimensional (2D) -wave Fermi superfluids from the BCS to the Bose limit. We compare…
Nanocontact vortex oscillators based on CoMnGe pseudo-spin valves
Jérémy Létang, Claudia de Melo, Charles Guillemard +9
We present an experimental study of vortex dynamics in magnetic nanocontacts based on pseudo spin valves comprising the CoMnGe Heusler compound. The films were grown by molecul…
Engineering CoMnAlSi Heusler compounds as a model system to correlate spin polarization, intrinsic Gilbert damping and ultrafast demagnetization
C. Guillemard, W. Zhang, G. Malinowski +8
Engineering of magnetic materials for developing better spintronic applications relies on the control of two key parameters: the spin polarization and the Gilbert damping responsib…
Color superfluidity of neutral ultra-cold fermions in the presence of color-flip and color-orbit fields
Doga Murat Kurkcuoglu, Carlos A. R. Sá de Melo
We describe how color superfluidity is modified in the presence of color-flip and color-orbit fields in the context of ultra-cold atoms, and discuss connections between this proble…
Quantum phases of interacting three-component fermions under the influence of spin-orbit coupling and Zeeman fields
Doga Murat Kurkcuoglu, C. A. R. Sa de Melo
We describe the quantum phases of interacting three component fermions in the presence of spin-orbit coupling, as well as linear and quadratic Zeeman fields. We classify the emergi…
Creating spin-one fermions in the presence of artificial spin-orbit fields: Emergent spinor physics and spectroscopic properties
Doga Murat Kurkcuoglu, C. A. R. Sa de Melo
We propose the creation and investigation of a system of spin-one fermions in the presence of artificial spin-orbit coupling, via the interaction of three hyperfine states of fermi…
Exchange interactions in the Hubbard-Stratonovich transformation for the stability analysis of itinerant ferromagnetism
Enya Vermeyen, Carlos A. R. Sá de Melo, Jacques Tempere
Itinerant ferromagnetism, i.e. spontaneous polarization of non-localized particles, is expected to occur for strong repulsive interactions in a spin-1/2 Fermi system. However, this…
Quantum phase transitions and Berezinskii-Kosterlitz-Thouless temperature in a two-dimensional spin-orbit-coupled Fermi gas
Jeroen P. A. Devreese, Jacques Tempere, Carlos A. R. Sá de Melo
We study the effect of spin-orbit coupling on both the zero-temperature and non-zero temperature behavior of a two-dimensional (2D) Fermi gas. We include a generic combination of R…
Parity violation in ferromagnet-superconductor heterostructures with strong spin-orbit coupling
P. M. Svetlichnyy, Z. Jiang, C. A. R. Sá de Melo
We study spectroscopic properties of ferromagnetic-superconductor heterostructures with strong spin-orbit coupling of the Rashba type and in the presence of exchange fields. The su…
Formation of Feshbach molecules in the presence of artificial spin-orbit coupling and Zeeman fields
Doga Murat Kurkcuoglu, C. A. R. Sa de Melo
We derive general conditions for the emergence of singlet Feshbach molecules in the presence of artificial Zeeman fields for arbritary mixtures of Rashba and Dresselhaus spin-orbit…
First-order phase transition and anomalous hysteresis of Bose gases in optical lattices
Daisuke Yamamoto, Takeshi Ozaki, Carlos A. R. Sá de Melo +1
We study the first-order quantum phase transitions of Bose gases in optical lattices. A special emphasis is placed on an anomalous hysteresis behavior, in which the phase transitio…
Wigner Crystallization in Two Dimensions: Evolution from Long- to Short-Ranged Forces
Benjamin M. Fregoso, C. A. R. Sá de Melo
We study fermions in two dimensions interacting via a long-ranged 1/r potential for small particle separations and a short-ranged 1/r^3 potential for larger separations in comparis…
Ultra-cold fermions in the flatland: evolution from BCS to Bose superfluidity in two-dimensions with spin-orbit and Zeeman fields
Li Han, C. A. R. Sá de Melo
We discuss the evolution from BCS to Bose superfluidity for ultracold fermions in two-dimensions and in the presence of simultaneous spin-orbit and Zeeman fields. We analyze severa…
Who is the Lord of the Rings: Majorana, Dirac or Lifshitz? The Spin-Orbit-Zeeman Saga in Ultra-cold Fermions
Kangjun Seo, Li Han, C. A. R. Sá de Melo
We discuss the emergence of rings of zero-energy excitations in momentum space for superfluid phases of ultra-cold fermions when spin-orbit, Zeeman fields and interactions are vari…
Artificial spin-orbit coupling in ultra-cold Fermi superfluids
Kangjun Seo, Li Han, C. A. R. Sá de Melo
We develop a theory for interacting fermions in the presence of spin-orbit coupling and Zeeman fields, and show that many new superfluids phases, which are topological in nature, e…
Topological phase transitions in ultra-cold Fermi superfluids: the evolution from BCS to BEC under artificial spin-orbit fields
Kangjun Seo, Li Han, C. A. R. Sá de Melo
We discuss topological phase transitions in ultra-cold Fermi superfluids induced by interactions and artificial spin orbit fields. We construct the phase diagram for population imb…
Evolution from BCS to BEC superfluidity in the presence of spin-orbit coupling
Li Han, C. A. R. Sá de Melo
We discuss the evolution from BCS to BEC superfluids in the presence of spin-orbit coupling, and show that this evolution is just a crossover in the balanced case. The dependence o…
Dipolar Bosons in Triangular Optical Lattices: Quantum Phase Transitions and Anomalous Hysteresis
Daisuke Yamamoto, Ippei Danshita, Carlos A. R. Sá de Melo
We study phase transitions and hysteresis in a system of dipolar bosons loaded into triangular optical lattices at zero temperature. We find that the quantum melting transition fro…
Density fluctuations and compressibility matrix for population or mass imbalanced Fermi-Fermi mixtures
Kangjun Seo, C. A. R. Sá de Melo
We describe the relation between the isothermal atomic compressibility and density fluctuations in mixtures of two-component fermions with population or mass imbalance. We derive a…
The evolution from BCS to BEC superfluidity in the presence of disorder
Li Han, C. A. R. Sá de Melo
We describe the effects of disorder on the critical temperature of -wave superfluids from the BCS to the BEC regime, with direct application to ultracold fermions. We use the fu…
Ultra-cold fermions in real or fictitious magnetic fields: The BCS-BEC evolution and the type-I--type-II transition
M. Iskin, C. A. R. Sa de Melo
We study ultra-cold neutral fermion superfluids in the presence of fictitious magnetic fields, as well as charged fermion superfluids in the presence of real magnetic fields. Charg…