Spectroscopic Bogoliubov features near the unitary limit

Domański, T.

doi:10.1103/physreva.84.023634

Cited by 5 publications

(7 citation statements)

References 47 publications

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“…However, its unambiguous identification is still under debate. Some of strong-coupling theories predict a pseudogap [136][137][138][139][140], while some others claim no such effects [141]. Ab-initio quantum Monte Carlo simulations of the spectral function have been performed [142,143], but the accuracy is yet to be improved.…”

Section: Virial Expansion Of Single-particle Spectral Functionmentioning

confidence: 99%

Virial expansion for a strongly correlated Fermi system and its application to ultracold atomic Fermi gases

2013

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Strongly correlated Fermi system plays a fundamental role in very different areas of physics, from neutron stars, quark-gluon plasmas, to high temperature superconductors. Despite the broad applicability, it is notoriously difficult to be understood theoretically because of the absence of a small interaction parameter. Recent achievements of ultracold trapped Fermi atoms near a Feshbach resonance have ushered in enormous changes. The unprecedented control of interaction, geometry and purity in these novel systems has led to many exciting experimental results, which are to be urgently understood at both low and finite temperatures. Here we review the latest developments of virial expansion for a strongly correlated Fermi gas and their applications on ultracold trapped Fermi atoms. We show remarkable, quantitative agreements between virial predictions and various recent experimental measurements at about the Fermi degenerate temperature. For equation of state, we discuss a practical way of determining high-order virial coefficients and use it to calculate accurately the long-sought third-order virial coefficient, which is now verified firmly in experiments at ENS and MIT. We discuss also virial expansion of a new many-body paramter -Tan's contact. We then turn to less widely discussed issues of dynamical properties. For dynamic structure factor, the virial prediction agrees well with the measurement at the Swinburne University of Technology. For single-particle spectral function, we show that the expansion up to the second order accounts for the main feature of momentum-resolved rf-spectroscopy for a resonantly interacting Fermi gas, as recently reported by JILA. In the near future, more practical applications with virial expansion are possible, owing to the ever-growing power in computation.

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Section: Virial Expansion Of Single-particle Spectral Functionmentioning

confidence: 99%

Virial expansion for a strongly correlated Fermi system and its application to ultracold atomic Fermi gases

2013

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“…AR has played an important role in the observation of transport signatures of exotic Majorana fermions in mesoscopic systems 4 . In addition, recent advances in cold-atomic systems promise new testbeds where theoretical findings 5,6 related to Andreev reflection can be demonstrated experimentally 7 . Crossed Andreev reflection (cAR) is a phenomenon closely related to AR and occurs in a system consisting of two normal metals attached to a superconductor [8][9][10][11][12][13][14][15][16][17][18][19][20][21] .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of crossed Andreev reflection in a superconducting ladder connected to normal metal leads

Soori

Mukerjee

2017

Phys. Rev. B

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Crossed Andreev reflection (cAR) is a scattering process that happens in a quantum transport set-up consisting of two normal metals (NM) attached to a superconductor (SC), where an electron incident from one NM results in a hole emerging in the other. Typically, electron tunnelling (ET) through the superconductor from one NM to the other competes with cAR and masks its signature in the conductance spectrum. We propose a novel scheme to enhance cAR, in which the SC part of the NM-SC-NM is side-coupled to another SC having a different superconducting phase to form a Josephson junction in the transverse direction. At strong enough coupling and for a large enough phase difference, one can smoothly traverse between the highly ET-dominant to the highly cARdominant transport regimes by tuning chemical potential, due to the appearance of subgap Andreev states that are extended in the longitudinal direction. We discuss connections to realistic systems.

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“…MBSs exist only in the non-trivial superconducting phase and correspond to the zero-energy modes E n = 0. For observing the MBS in the system, the following quantities can be considered: (i) the local density of states (LDOS) [23], (ii) the density of Majorana quasiparticles P M [24], and (iii) the topological quantum number Q [25]. Below, we briefly discuss each of them.…”

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confidence: 99%

Quantum engineering of Majorana quasiparticles in one-dimensional optical lattices

Ptok

Cichy

Domański

2018

J. Phys.: Condens. Matter

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We propose a feasible way of engineering Majorana-type quasiparticles in ultracold fermionic gases on a one-dimensional (1D) optical lattice. For this purpose, imbalanced ultracold atoms interacting by the spin-orbit coupling should be hybridized with a three-dimensional Bose-Einstein condensate molecular cloud. We show that the Majorana-type excitations can be created or annihilated upon constraining the profile of a trapping potential and/or an internal scattering barier. This process is modeled within the Bogoliubov-de Gennes approach. Our study is relevant also to nanoscopic 1D superconductors, where both potentials can be imposed by electrostatic means.

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Spectroscopic Bogoliubov features near the unitary limit

Cited by 5 publications

References 47 publications

Virial expansion for a strongly correlated Fermi system and its application to ultracold atomic Fermi gases

Virial expansion for a strongly correlated Fermi system and its application to ultracold atomic Fermi gases

Enhancement of crossed Andreev reflection in a superconducting ladder connected to normal metal leads

Quantum engineering of Majorana quasiparticles in one-dimensional optical lattices

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