Interaction of Magnetic Fields with Spinons in a Fractionalized State

• URL: http://arxiv.org/abs/2408.13665v4
• Date: Wed, 23 Jul 2025 16:01:28 GMT
• Title: Interaction of Magnetic Fields with Spinons in a Fractionalized State
• Authors: Yu Zhang, Hengdi Zhao, Tristan R. Cao, Rahul Nandkishore, Pedro Schlottmann, Lance Delong, Gang Cao,
• Abstract summary: Applying a magnetic field up to 14 T causes an abrupt increase in heat capacity by as much as 5000% below 150 mK.<n>Spinons, though charge-neutral, are highly sensitive to magnetic fields at low temperatures.
• Score: 4.249804623327605
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The 4d-electron trimer lattice exhibits either a quantum spin liquid (QSL) or a heavy-fermion strange metal (HFSM) phase, depending on Nb content. In the QSL state, itinerant spinons act as effective heat carriers, enhancing thermal conductivity. Strikingly, applying a magnetic field up to 14 T causes an abrupt increase in heat capacity by as much as 5000% below 150 mK, disrupting the linear temperature dependence characteristic of both phases. Meanwhile, AC magnetic susceptibility and electrical resistivity remain nearly unchanged, while thermal conductivity is suppressed by up to 40% below 4 K. These observations suggest that spinons, though charge-neutral, are highly sensitive to magnetic fields at low temperatures. We propose that the field induces Anderson localization of spinons, leading to emergent non-magnetic two-level systems that account for the rapid rise in heat capacity. These findings uncover a previously unexplored regime of spinon dynamics, governed by field-induced localization and distinct from conventional magnetic or transport signatures. Comments: To appear in npj Quantum Materials.

Related papers

• Fourth-order quantum master equations reveal that spin-phonon decoherence undercuts long magnetization relaxation times in single-molecule magnets [55.2480439325792]
  We numerically implement fourth-order quantum master equations to account for coherence terms and describe the full effect of up to two-phonon processes on spin dynamics.<n>We show that while strong axial magnetic anisotropy ensures slow magnetic relaxation approaching seconds at 77 K, the superposition of Kramers doublets is coherent for less than 10 ns due to a novel two-phonon pure dephasing mechanism.
  arXiv  Detail & Related papers  (2025-07-28T11:13:33Z)
• Field-tunable spin disordered phase in the triangular-lattice delafossite TlYbSe2 [0.0]
  We introduce a relatively disorder-free frustrated triangular lattice compound TlYbSe2 belonging to the rare-earth delafossite family. While DC magnetization suggests magnetic exchange interactions in the order of several kelvin, the zero-field AC magnetization and heat capacity measurements reveal no signs of long-range magnetic order down to 20 mK.
  arXiv  Detail & Related papers  (2025-04-07T18:59:51Z)
• Controllable and Continuous Quantum Phase Transitions in Intrinsic Magnetic Topological Insulator [50.54133633499971]
  We study the intrinsic magnetic topological material MnBi2Te4 in which the heavy n-type doping features are strongly suppressed. Based on angle-resolved photoemission spectroscopy, transport measurements, and first-principles calculations, we reveal two magnetism-induced TPTs. Our work paves the way for the realization of intrinsic magnetic topological states in MnBi2Te4 family and provides an ideal platform for achieving controllable and continuous TPTs.
  arXiv  Detail & Related papers  (2025-03-08T03:46:54Z)
• Evidence for reentrant quantum paraelectric state preceded by a multiglass phase with non-classical exponent and magnetodielectric coupling in SrFe12O19 [0.0]
  Evidence for a re-entrant quantum paraelectric (QPE) state preceded by a dipole glass (DG) phase with a non-classical exponent in the quantum critical regime of SrFe12O19 is presented.
  arXiv  Detail & Related papers  (2023-12-17T06:14:46Z)
• Robust room temperature ferromagnetism in an itinerant van der Waals antiferromagnet [4.586172029546092]
  coexistence of antiferromagnetic and ferromagnetic order at room temperature in single-phase van der Waals materials has attracted significant research interest. A notable phenomenon observed is the evident odd-even layer-number effect at high temperature. The robust ferromagnetic order observed in even-layer flakes at low temperature could potentially be attributed to spin-polarized defects.
  arXiv  Detail & Related papers  (2023-11-03T06:13:22Z)
• An anti-maser for quantum-limited cooling of a microwave cavity [58.720142291102135]
  We experimentally demonstrate how to generate a state in condensed matter at moderate cryogenic temperatures. This state is then used to efficiently remove microwave photons from a cavity. Such an "anti-maser" device could be extremely beneficial for applications that would normally require cooling to millikelvin temperatures.
  arXiv  Detail & Related papers  (2023-07-24T11:12:29Z)
• Imaging magnetism evolution of magnetite to megabar pressure range with quantum sensors in diamond anvil cell [57.91882523720623]
  We develop an in-situ magnetic detection technique at megabar pressures with high sensitivity and sub-microscale spatial resolution. We observe the macroscopic magnetic transition of Fe3O4 in the megabar pressure range from strong ferromagnetism (alpha-Fe3O4) to weak ferromagnetism (beta-Fe3O4) and finally to non-magnetism (gamma-Fe3O4) The presented method can potentially investigate the spin-orbital coupling and magnetism-superconductivity competition in magnetic systems.
  arXiv  Detail & Related papers  (2023-06-13T15:19:22Z)
• Finite Temperature Dynamics of Spin Solitons with Applications in Thermocouples and Refrigerators [0.0]
  We extend our mechanism to spin thermoelectrics by probing responses of ferrimagnetic domain walls (DWs) to thermal gradients. voltages here stem from DW-spin collective motion, in contrast to normal electron transport phenomena. These findings deepen our understanding of heat-driven DW kinetics and suggest profitable new directions in an emerging realm of spincaloritronics.
  arXiv  Detail & Related papers  (2023-04-13T15:21:40Z)
• 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)
• Magnetic field-controlled lattice thermal conductivity in MnBi2Te4 [0.0]
  We discover a new way to control the lattice thermal conductivity, generating both a positive and a negative magnetic field dependence. This finding may open a way to design magnetically controlled heat switches.
  arXiv  Detail & Related papers  (2022-03-15T16:15:10Z)
• Fabrication of Surface Ion Traps with Integrated Current Carrying Wires enabling High Magnetic Field Gradients [0.0]
  A major challenge for quantum computers is the scalable simultaneous execution of quantum gates. One approach to address this in trapped ion quantum computers is the implementation of quantum gates based on static magnetic field gradients and global microwave fields. We present the fabrication of surface ion traps with integrated copper current carrying wires embedded inside the substrate below the ion trap electrodes.
  arXiv  Detail & Related papers  (2022-02-04T18:52:29Z)
• Engineering the Radiative Dynamics of Thermalized Excitons with Metal Interfaces [58.720142291102135]
  We analyze the emission properties of excitons in TMDCs near planar metal interfaces. We find suppression or enhancement of emission relative to the point dipole case by several orders of magnitude. nanoscale optical cavities are a viable pathway to generating long-lifetime exciton states in TMDCs.
  arXiv  Detail & Related papers  (2021-10-11T19:40:24Z)
• Measurement of the Low-temperature Loss Tangent of High-resistivity Silicon with a High Q-factor Superconducting Resonator [58.720142291102135]
  We present the direct loss tangent measurement of a high-resist intrinsicivity (100) silicon wafer in the temperature range from 70 mK to 1 K. The measurement was performed using a technique that takes advantage of a high quality factor superconducting niobium resonator.
  arXiv  Detail & Related papers  (2021-08-19T20:13:07Z)
• Low Temperature Relaxation of Donor Bound Electron Spins in $^{28}$Si:P [0.0]
  We measure the spin-lattice relaxation of donor bound electrons in ultrapure, isotopically enriched, phosphorus-doped $28$Si:P. The $28$Si:P spin relaxation rate increases linearly with temperature in the regime below 1 K. At high magnetic fields, the spin relaxation is dominated by the magnetic field dependent single phonon spin relaxation process.
  arXiv  Detail & Related papers  (2021-04-12T16:54:52Z)
• Demonstrating levitation within a microwave cavity [0.0]
  We report the first successful experiments with a levitated millimeter-scale neodymium magnet within a centimeter-scale superconducting aluminum coaxial quarter-wave stub cavity. Resonance spectra are collected via a vector network analyzer (VNA) between temperatures of 5 K and 50 mK revealing movement of the magnet inside of the cavity.
  arXiv  Detail & Related papers  (2021-01-05T01:42:09Z)
• 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)
• Ferromagnetic Gyroscopes for Tests of Fundamental Physics [49.853792068336034]
  A ferromagnetic gyroscope (FG) is a ferromagnet whose angular momentum is dominated by electron spin polarization and that will precess under the action of an external torque. We model and analyze FG dynamics and sensitivity, focusing on practical schemes for experimental realization.
  arXiv  Detail & Related papers  (2020-10-17T07:13:50Z)
• Electrically tuned hyperfine spectrum in neutral Tb(II)(Cp$^{\rm{iPr5}}$)$_2$ single-molecule magnet [64.10537606150362]
  Both molecular electronic and nuclear spin levels can be used as qubits. In solid state systems with dopants, an electric field was shown to effectively change the spacing between the nuclear spin qubit levels. This hyperfine Stark effect may be useful for applications of molecular nuclear spins for quantum computing.
  arXiv  Detail & Related papers  (2020-07-31T01:48:57Z)
• Machine Learning Guided Discovery of Gigantic Magnetocaloric Effect in HoB$_{2}$ Near Hydrogen Liquefaction Temperature [0.7782210470180305]
  We report the experimental discovery of gigantic magnetic entropy change 40.1 J kg$-1$ K$-1$ (0.35 J cm$-3$ K$-1$) for a field change of 5 T in the vicinity of a ferromagnetic second-order phase transition with a Curie temperature of 15 K. This is the highest value reported so far, to our knowledge, near the hydrogen liquefaction temperature thus it is a highly suitable material for hydrogen liquefaction and low temperature magnetic cooling applications.
  arXiv  Detail & Related papers  (2020-05-12T08:52:28Z)
• Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions [57.50861918173065]
  Electrical control of spins at the nanoscale offers architectural advantages in spintronics. Recent demonstrations of electric-field (E-field) sensitivities in molecular spin materials are tantalising. E-field sensitivities reported so far are rather weak, prompting the question of how to design molecules with stronger spin-electric couplings.
  arXiv  Detail & Related papers  (2020-05-03T09:27:31Z)
• Direct control of high magnetic fields for cold atom experiments based on NV centers [50.591267188664666]
  In cold atomic gases the interactions between the atoms are directly controllable through external magnetic fields. Here, we overcome the limitations of such an indirect control through a direct feedback scheme. We achieve a control of better than 1 ppm after 20 minutes of integration time, ensuring high long-term stability for experiments.
  arXiv  Detail & Related papers  (2020-03-18T09:03:25Z)

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.