Tunneling study in granular aluminum near the Mott metal-to-insulator transition

Moshe, Aviv Glezer; Tuvia, Gal; Avraham, Shilo; Farber, E.; Deutscher, G.

doi:10.1103/physrevb.104.054508

Phys. Rev. B

2021

DOI: 10.1103/physrevb.104.054508

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Tunneling study in granular aluminum near the Mott metal-to-insulator transition

Aviv Glezer Moshe

Gal Tuvia

Shilo Avraham

et al.

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Cited by 6 publications

(1 citation statement)

References 30 publications

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“…Thin films with a thickness of 40-60 nm were thermally evaporated on R-plane sapphire substrates held at liquid nitrogen temperature (samples A-C), similar to previous works. 23,24 An additional device made on a substrate held at room temperature was investigated for comparison (sample D). A Hall bar or a square sample deposited simultaneously was used to assess the quality of the thin films.…”

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confidence: 99%

Granular aluminum nano-superconducting quantum interference device

Avraham,

Bachar,

Glezer Moshe

et al. 2023

Applied Physics Letters

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Granular aluminum (grAl) is an applied quantum material. We present nano-superconducting quantum interference devices (nanoSQUIDs) based on grAl thin films. These devices exhibit non-hysteretic behavior, allowing conventional SQUID readout down to temperatures well below the critical temperature as well as detection properties comparable to those of Dayem bridge-based devices of greater complexity. Despite being much longer than the coherence length, the current–phase relation of these grAl constrictions appears to be single valued at least down to half their critical temperature. This suggests that grAl thin films should be described as a network of inter-grain Josephson junctions.

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confidence: 99%

Granular aluminum nano-superconducting quantum interference device

Avraham,

Bachar,

Glezer Moshe

et al. 2023

Applied Physics Letters

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From a superconductor to a Mott insulator: The case of granular aluminum

Bachar,

Moshe

2023

Physica C: Superconductivity and its Applications

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Spatial emergence of off-diagonal long-range order throughout the BCS-BEC crossover

2022

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In a superfluid system, off-diagonal long-range order is expected to be exhibited in the appropriate reduced density matrices when the relevant particles (either bosons or fermion pairs) are considered to recede sufficiently far apart from each other. This concept is usually exploited to identify the value of the condensate density, without explicit concern, however, as to the spatial range over which this asymptotic condition can effectively be achieved. Here, based on a diagrammatic approach that includes beyond-mean-field pairing fluctuations in the broken-symmetry phase at the level of the t-matrix also with the inclusion of the Gorkov-Melik-Barkhudarov (GMB) correction, we present a systematic study of the two-particle reduced density matrix for a superfluid fermionic system undergoing the BCS-BEC crossover, when the entities to recede far apart from each other evolve with continuity from largely overlapping Cooper pairs in the BCS limit to dilute composite bosons in the BEC limit. By this approach, we not only provide the coupling and temperature dependence of the condensate density at the level of our diagrammatic approach, which includes the GMB correction, but we also obtain the evolution of the spatial dependence of the two-particle reduced density matrix, from a power law at low temperature to an exponential dependence at high temperature in the superfluid phase, when the interparticle coupling spans the BCS-BEC crossover. Our results put limitations on the minimum spatial extent of a finite-size system for which superfluid correlations can effectively be established.

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Tunneling study in granular aluminum near the Mott metal-to-insulator transition

Cited by 6 publications

References 30 publications

Granular aluminum nano-superconducting quantum interference device

Granular aluminum nano-superconducting quantum interference device

From a superconductor to a Mott insulator: The case of granular aluminum

Spatial emergence of off-diagonal long-range order throughout the BCS-BEC crossover

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