Real-space imaging of dispersive triplon excitations in engineered quantum magnets

Abstract

Quantum magnets provide a powerful platform to explore complex quantum many-body phenomena. One example is triplon excitations, exotic many-body modes emerging from deconfined singlet-triplet transitions with no single particle analog. Triplons are challenging to observe in conventional materials, as the energy scales of singlet-triplet transitions are associated with Hund's energy and are dramatically larger than the typical bandwidth of spin fluctuations. We engineer a minimal quantum magnet from organic molecules and demonstrate the emergence of dispersive triplon modes in one- and two-dimensional assemblies probed with scanning tunneling microscopy and spectroscopy. We show the variable bandwidth of triplon excitations in these two different geometries. Our results provide the first demonstration of dispersive triplon excitations from a real-space measurement, suggesting their potential engineering to realize exotic many-body phenomena in quantum magnets without breaking time-reversal symmetry.

References in corpus (31)

• Fractionalized excitations in the spin liquid state of a kagomé lattice antiferromagnet
• The Kernel Polynomial Method
• The ITensor Software Library for Tensor Network Calculations
• Characterization of collective ground states in single-layer NbSe2
• Quantum magnetism and criticality
• Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chain
• Spontaneous Magnon Decays
• Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl3
• Fractional excitations in the square-lattice quantum antiferromagnet
• Spin Excitations and Correlations in Scanning Tunneling Spectroscopy
• Spinons and triplons in spatially anisotropic frustrated antiferromagnets
• Coupled Yu-Shiba-Rusinov states in molecular dimers on NbSe${}_2$
• Tuning the magnetic anisotropy of single molecules
• One- and Two-Triplon Spectra of a Cuprate Ladder
• A Tunable Two-impurity Kondo system in an atomic point contact
• Topological Triplon Modes and Bound States in a Shastry-Sutherland Magnet
• Collective spin excitations in a quantum spin ladder probed by high-resolution Resonant Inelastic X-ray Scattering
• Chebyshev Matrix Product State Impurity Solver for the Dynamical Mean-Field Theory
• Chebyshev expansion for Impurity Models using Matrix Product States
• Tuning the exchange bias on a single atom from 1 mT to 10 T
• Observation of Coexistence of Yu-Shiba-Rusinov States and Spin-Flip Excitations
• Yu-Shiba-Rusinov states in the charge-density modulated superconductor NbSe2
• Mesoscopic Phase Coherence in a Quantum Spin Fluid
• Theory of Quantum Oscillations of Magnetization in Kondo Insulators
• Topological magnetic excitations
• Topological spin excitations in Harper-Heisenberg spin chains
• Fermionic spin excitations in two and three-dimensional antiferromagnets
• Correlated decay of triplet excitations in the Shastry-Sutherland compound SrCu${}_2$(BO${}_3$)${}_2$
• Triplon band splitting and topologically protected edge states in the dimerized antiferromagnet
• Solitonic in-gap modes in a superconductor-quantum antiferromagnet interface
• Inversion and magnetic quantum oscillations in symmetric periodic Anderson model

Cited by in corpus (3)

• Hamiltonian Learning of Triplon Excitations in an Artificial Nanoscale Molecular Quantum Magnet
• Hamiltonian-learning quantum magnets with non-local impurity tomography
• Phase diagram of the J1-J2 Heisenberg second-order topological quantum magnet