2023/10/18 by Madhuparna Karmakar, Rajesh Narayanan, Karmakar, Madhuparna +1
Materials Science · Physics and Astronomy · #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Quantum Gases (cond-mat.quant-gas) #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2310.12194
openalex publication_date 2023/10/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
We present the first instance of a disorder tuned Fermi-Bose crossover that could be realized in superconducting systems. More specifically, harnessing a non perturbative numerical technique we analyze the ground state behavior of a two-dimensional attractive Hubbard model subjected to spin selective disorder potential. In particular, using spectroscopic properties we provide unambiguous evidence of the change in the Fermi surface topology as a function of the disorder, establishing incontrovertibly a Fermi-Bose crossover. Interplay of strong correlations and strong disorder brings out the spin selectivity in the properties of this system giving rise to spin selective "Bose metal/insulator" phase. We propose an experimental set-up where such disorder tuned Fermi-Bose crossover could be observed in two-dimensional electron gas formed at oxide interface. Finally, we speculate on the possible implication of such spin-selective disorder on unraveling signatures of Bose-Fermi cross-over on doped iron chalcogenide superconductors.