Quantum interference between quasi-2D Fermi surface sheets in UTe2

Abstract

UTe${}_2$ is a spin-triplet superconductor candidate for which high quality samples with long mean free paths have recently become available, enabling quantum oscillation measurements to probe its Fermi surface and effective carrier masses. It has recently been reported that UTe${}_2$ possesses a 3D Fermi surface component [Phys. Rev. Lett. 131, 036501 (2023)]. The distinction between 2D and 3D Fermi surface sections in triplet superconductors can have important implications regarding the topological properties of the superconductivity. Here we report the observation of oscillatory components in the magnetoconductance of UTe${}_2$ at high magnetic fields. We find that these oscillations are well described by quantum interference between quasiparticles traversing semiclassical trajectories spanning magnetic breakdown networks. Our observations are consistent with a quasi-2D model of this material's Fermi surface based on prior dHvA-effect measurements. Our results strongly indicate that UTe${}_2$ -- which exhibits a multitude of complex physical phenomena -- possesses a remarkably simple Fermi surface consisting exclusively of two quasi-2D cylindrical sections.

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• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Observation of odd-parity superconductivity in UTe2
• Nodal superconducting gap structure and topological surface states of UTe${}_2$
• Quasiparticle interference and spectral function of the UTe${}_2$ superconductive surface band
• Magnetic signatures of pressure-induced multicomponent superconductivity in UTe${}_2$
• Dramatic elastic response at the critical end point in UTe${}_2$
• Higher-order topological phases for time-reversal-symmetry breaking superconductivity in UTe${}_2$
• Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe${}_2$
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Nodal Superconductivity of UTe${}_2$ Probed by Field-Angle-Resolved Specific Heat on a Crystal with $T_{\mathrm{c}}=2.1$ K
• Magnetic fluctuations and anisotropy in UTe2: a multi-orbital study based on GGA+U and RPA
• Pressure-enhanced $f$-electron orbital weighting in UTe2 mapped by quantum interferometry
• Quasiparticle Interference of Spin-Triplet Superconductors: Application to UTe${}_2$
• Electronic structure of UTe${}_2$ under pressure
• Raman response of collective modes in multicomponent superconductors