Observation of spin-orbit coupling induced Weyl points and topologically protected Kondo effect in a two-electron double quantum dot

Abstract

Recent years have brought an explosion of activities in the research of topological aspects of condensed-matter systems. Topologically non-trivial phases of matter are typically accompanied by protected surface states or exotic degenerate excitations such as Majorana end states or Haldane's localized spinons. Topologically protected degeneracies can, however, also appear in the bulk. An intriguing example is provided by Weyl semimetals, where topologically protected electronic band degeneracies and exotic surface states emerge even in the absence of interactions. Here we demonstrate experimentally and theoretically that Weyl degeneracies appear naturally in an interacting quantum dot system, for specific values of the external magnetic field. These magnetic Weyl points are robust against spin-orbit coupling unavoidably present in most quantum dot devices. Our transport experiments through an InAs double dot device placed in magnetic field reveal the presence of a pair of Weyl points, exhibiting a robust ground state degeneracy and a corresponding protected Kondo effect.

arXiv comment6 pages, 3 figures. Supplementary Information can be downloaded as an ancillary pdf file

References in corpus (33)

• Weyl and Dirac Semimetals in Three Dimensional Solids
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Helical liquids and Majorana bound states in quantum wires
• Spins in few-electron quantum dots
• Kondo Physics in a Single Electron Transistor
• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Coherent control of a single electron spin with electric fields
• From the Kondo Regime to the Mixed-Valence Regime in a Single-Electron Transistor
• The Kondo Effect in the Unitary Limit
• Spin-orbit qubit in a semiconductor nanowire
• Kondo physics in carbon nanotubes
• Revival of the Kondo effect
• Kondo effect in an integer-spin quantum dot
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Spectroscopy of spin-orbit quantum bits in indium antimonide nanowires
• A coherent beam splitter for electronic spin states
• Suppressing Spin Qubit Dephasing by Nuclear State Preparation
• Multi-terminal Josephson junctions as topological materials
• Observation of topological transitions in interacting quantum circuits
• Plasmon Weyl Degeneracies in Magnetized Plasma
• Measuring a topological transition in an artificial spin 1/2 system
• Universal Scaling in Non-equilibrium Transport Through a Single-Channel Kondo Dot
• Field Tuning the G-Factor in InAs Nanowire Double Quantum Dots
• Suppression of spin relaxation in an InAs nanowire double quantum dot
• Pauli Spin Blockade in the Presence of Strong Spin-Orbit Coupling
• Probing low noise at the MOS interface with a spin-orbit qubit
• Spin-orbit coupling and operation of multi-valley spin qubits
• Dynamical Quantum Hall Effect in the Parameter Space
• Integrated silicon qubit platform with single-spin addressability, exchange control and robust single-shot singlet-triplet readout
• Exploring the phase diagram of the two-impurity Kondo problem
• Tunable Kondo physics in a carbon nanotube double quantum dot
• Anisotropic Pauli spin-blockade effect and spin-orbit interaction field in an InAs nanowire double quantum dot
• $g$-factor anisotropy in nanowire-based InAs quantum dots

Cited by in corpus (13)

• Mixed topological semimetals driven by orbital complexity in two-dimensional ferromagnets
• Discovery of a magnetic Dirac system with large intrinsic non-linear Hall effect
• Chirality flip of Weyl nodes and its manifestation in strained MoTe${}_2$
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
• Classification and magic magnetic-field directions for spin-orbit-coupled double quantum dots
• Magnetic degeneracy points in interacting two-spin systems: geometrical patterns, topological charge distributions, and their stability
• Weyl point immersed in a continuous spectrum: an example from superconducting nanostructures
• Spintronics with a Weyl point in superconducting nanostructures
• Magnetically-Tuned Kondo Effect in a Molecular Double Quantum Dot: Role of the Anisotropic Exchange
• Stability of Weyl node merging processes under symmetry constraints
• Topological charge distributions of an interacting two-spin system
• Four-state discrimination for a pair of spin qubits via gate reflectometry
• The geometry of the Hermitian matrix space and the Schrieffer--Wolff transformation