scholarly journals Weak-field induced nonmagnetic state in a Co-based honeycomb

2020 ◽  
Vol 6 (4) ◽  
pp. eaay6953 ◽  
Author(s):  
Ruidan Zhong ◽  
Tong Gao ◽  
Nai Phuan Ong ◽  
Robert J. Cava
Keyword(s):  
Magnetic Field ◽  
Experimental Studies ◽  
Weak Field ◽  
Quantum Spin ◽  
Orbit Coupling ◽  
Spin Liquid ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Quantum Spin Liquid ◽  
Low Magnetic Field

Layered honeycomb magnets are of interest as potential realizations of the Kitaev quantum spin liquid (KQSL), a quantum state with long-range spin entanglement and an exactly solvable Hamiltonian. Conventional magnetically ordered states are present for all currently known candidate materials, however, because non-Kitaev terms in the Hamiltonians obscure the Kitaev physics. Current experimental studies of the KQSL are focused on 4d or 5d transition metal–based honeycombs, in which strong spin-orbit coupling can be expected, yielding Kitaev interaction that dominates in an applied magnetic field. In contrast, for 3d-based layered honeycomb magnets, spin-orbit coupling is weak, and thus, Kitaev physics should be substantially less accessible. Here, we report our studies on BaCo2(AsO4)2, for which we find that the magnetic order associated with the non-Kitaev interactions can be fully suppressed by a relatively low magnetic field, yielding a nonmagnetic material and implying the presence of strong magnetic frustration and weak non-Kitaev interactions.

scholarly journals Spin Liquid versus Spin Orbit Coupling on the Triangular Lattice

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Jason Iaconis ◽  
Chunxiao Liu ◽  
Gábor Halász ◽  
Leon Balents
Keyword(s):  
Triangular Lattice ◽  
Quantum Spin ◽  
Orbit Coupling ◽  
Spin Liquid ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Liquid States ◽  
Quantum Spin Liquid ◽  
The Relationship ◽  
Liquid Physics

In this paper, we explore the relationship between strong spin-orbit coupling and spin liquid physics. We study a very general model on the triangular lattice where spin-orbit coupling leads to the presence of highly anisotropic interactions. We use variational Monte Carlo to study both U(1)U(1) quantum spin liquid states and ordered ones, via the Gutzwiller projected fermion construction. We thereby obtain the ground state phase diagram in this phase space. We furthermore consider effects beyond the Gutzwiller wavefunctions for the spinon Fermi surface quantum spin liquid, which are of particular importance when spin-orbit coupling is present.

scholarly journals Random Rashba spin-orbit coupling at the quantum spin Hall edge

2014 ◽  
Vol 89 (23) ◽  
Author(s):  
Florian Geissler ◽  
François Crépin ◽  
Björn Trauzettel
Keyword(s):  
Quantum Spin ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Rashba Spin ◽  
Quantum Spin Hall

scholarly journals Spin-Orbit Coupling Effects on Transport Properties of Electronic Lieb Lattice in the Presence of Magnetic Field

2021 ◽  
Author(s):  
Elham Sadeghi ◽  
Hamed Rezania
Keyword(s):  
Magnetic Field ◽  
Thermal Conductivity ◽  
Seebeck Coefficient ◽  
Temperature Dependence ◽  
Transport Properties ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Lieb Lattice ◽  
Thermal Conductivities

Abstract In this paper, the transport properties of a two-dimensional Lieb lattice that is a line-centered square lattice are investigated in the presence of magnetic field and spin-orbit coupling. Specially, we address the temperature dependence of electrical and thermal conductivities as well as Seebeck coefficient due to spin-orbit interaction. We have exploited Green’s function approach in order to study thermoelectric and transport properties of Lieb lattice in the context of Kane-Mele model Hamiltonian. The results for Seebeck coefficient show the sign of thermopower is positive in the presence of spin-orbit coupling. Also the temperature dependence of transport properties indicates that the increase of spin-orbit coupling leads to decrease thermal conductivity however the decrease of gap 1 parameter causes the reduction of thermal conductivity. There is a peak in temperature dependence of thermal conductivity for all values of magnetic fields and spin-orbit coupling strengths. Both electrical and thermal conductivities increase with increasing the temperature at low amounts of temperature due to the increasing of transition rate of charge carriers and excitation of them to the conduction bands. Also we have studied the temperature dependence of spin susceptibility of Lieb monolayer due to both spin orbit coupling and magnetic field factors in details.

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