The thickness dependence of quantum oscillations in ferromagnetic Weyl metal SrRuO$_{3}$

• URL: http://arxiv.org/abs/2112.13331v2
• Date: Wed, 21 Sep 2022 03:17:26 GMT
• Title: The thickness dependence of quantum oscillations in ferromagnetic Weyl metal SrRuO$_{3}$
• Authors: Uddipta Kar, Akhilesh Kr. Singh, Yu-Te Hsu, Chih-Yu Lin, Bipul Das, Cheng-Tung Cheng, M. Berben, Song Yang, Chun-Yen Lin, Chia-Hung Hsu, S. Wiedmann, Wei-Cheng Lee, Wei-Li Lee
• Abstract summary: Weyl metal SrRuO$_3$ thin films with different thicknesses were grown on miscut Sr$_3$ (001) substrates. Magneto-transport measurements were carried out in magnetic fields up to 35 T. We discovered a frequency $F approx$ 30 T at low temperatures and above 3 T that corresponds to a small Fermi pocket with a light effective mass.
• Score: 4.354101112823455
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Quantum oscillations in resistivity and magnetization at high magnetic fields are a macroscopic fingerprint of the energy quantization due to the cyclotron motion of quasiparticles. In a thin Weyl semimetal, a unique thickness dependent Weyl-orbit quantum oscillation was proposed to exist, originating from a nonlocal cyclotron orbit via the electron tunneling between the top and bottom Fermi-arc surface states. Here, untwinned and high crystalline Weyl metal SrRuO$_3$ thin films with different thicknesses were grown on miscut SrTiO$_3$ (001) substrates. Magneto-transport measurements were carried out in magnetic fields up to 35 T, and quantum oscillations with different frequencies were observed and compared to the calculated band structure. In particular, we discovered a frequency $F \approx$ 30 T at low temperatures and above 3 T that corresponds to a small Fermi pocket with a light effective mass. Its oscillation amplitude appears to be at maximum for film thicknesses in a range of 10 to 20 nm, and the phase of the oscillation exhibits a systematic change with the film thickness. After isolating the well separated frequencies, the constructed Landau fan diagram shows an unusual concave downward curvature in the 1/$\mu_0H_n$-$n$ curve, where $n$ is the Landau level index. Based on the rigorous analysis of the thickness and field-orientation dependence of the quantum oscillations, the oscillation with $F \approx$ 30 T is attributed to be of surface origin, which is related to the Fermi-arc surface state originating from non-overlapping Weyl nodes projected on the film's surface plane. Those findings can be understood within the framework of the Weyl-orbit quantum oscillation effect with non-adiabatic corrections.

Related papers

• Magnetoresistance oscillations induced by geometry in a two-dimensional quantum ring [0.0]
  We consider a GaAs device having an average radius of $800hspace0.05cmtextnm$ in different regimes of subband occupation at non-zero temperature. We explore how the modified surface affects the Van-Hoove conductance singularities and the magnetoresistance interference patterns resulting from the Aharonov-Bohm oscillations of different frequencies.
  arXiv  Detail & Related papers  (2024-06-21T13:54:40Z)
• Three-photon electron spin resonances [0.0]
  We report the observation of a three-photon resonant transition of charge-carrier spins in an organic light-emitting diode. Ratios of drive-induced shifts of this line to those of two-emitting and one-photon shifts agree with analytical expressions derived from the Floquet Hamiltonian.
  arXiv  Detail & Related papers  (2023-12-19T21:29:45Z)
• Precision Multi-Mode Microwave Spectroscopy of Paramagnetic and Rare-Earth Ion Spin Defects in Single Crystal Calcium Tungstate [0.0]
  We present experimental observations of dilute ion spin ensemble defects in a low-loss single crystal cylindrical sample of CaWO$_4$ cooled to $30$ mK in temperature. The resonator exhibited numerous whispering gallery modes with high $Q$-factors of up to $3times 107$, equivalent to a loss tangent of $sim 3times 10-8$.
  arXiv  Detail & Related papers  (2023-12-08T17:41:06Z)
• Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
  A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
  arXiv  Detail & Related papers  (2023-05-10T12:59:07Z)
• Thermal self-oscillations in monolayer graphene coupled to a superconducting microwave cavity [58.720142291102135]
  We observe thermal self-oscillations in a monolayer graphene flake coupled to superconducting resonator. The experimental observations fit well with theoretical model based on thermal instability. The modelling of the oscillation sidebands provides a method to evaluate electron phonon coupling in disordered graphene sample at low energies.
  arXiv  Detail & Related papers  (2022-05-27T15:38:41Z)
• Phase diagram of a distorted kagome antiferromagnet and application to Y-kapellasite [50.591267188664666]
  We reveal a rich ground state phase diagram even at the classical level. The presented model opens a new direction in the study of kagome antiferromagnets.
  arXiv  Detail & Related papers  (2021-07-28T18:00:03Z)
• Photon Condensation and Enhanced Magnetism in Cavity QED [68.8204255655161]
  A system of magnetic molecules coupled to microwave cavities undergoes the equilibrium superradiant phase transition. The effect of the coupling is first illustrated by the vacuum-induced ferromagnetic order in a quantum Ising model. A transmission experiment is shown to resolve the transition, measuring the quantum electrodynamical control of magnetism.
  arXiv  Detail & Related papers  (2020-11-07T11:18:24Z)
• Magnetic Gradient Fluctuations from Quadrupolar $^{73}$Ge in Si/SiGe Exchange-Only Qubits [0.0]
  We study the time-fluct magnetic gradient noise mechanisms in pairs of Si/SiGe quantum dots using exchange echo noise spectroscopy. We find that quadrupolar precession of the $73$Ge nuclei play a key role in the spin-echo decay time $T$, with a characteristic dependence on magnetic field and the width of the Si quantum well.
  arXiv  Detail & Related papers  (2020-09-17T05:32:21Z)
• Mechanical Decoupling of Quantum Emitters in Hexagonal Boron Nitride from Low-Energy Phonon Modes [52.77024349608834]
  Quantum emitters in hexagonal Boron Nitride (hBN) were recently reported to hol a homogeneous linewidth according to the Fourier-Transform limit up to room temperature. This unusual observation was traced back to decoupling from in-plane phonon modes which can arise if the emitter is located between two planes of the hBN host material.
  arXiv  Detail & Related papers  (2020-04-22T20:00:49Z)
• Non-trivial quantum magnetotransport oscillations in pure and robust topological $\alpha$-Sn films [58.720142291102135]
  We report experimental evidence of topological Dirac fermion charge carriers in pure and robust $alpha$-Sn films grown on InSb substrates. A surface band, with low carrier density and high mobility, is identified as the origin of the observed Shubnikov -- de Haas oscillations.
  arXiv  Detail & Related papers  (2020-02-27T16:46:11Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.