Spin structure factors of doped monolayer Germanene in the presence of spin-orbit coupling

AbstractIn this paper, we present a Kane-Mele model in the presence of magnetic field and next nearest neighbors hopping amplitudes for investigations of the spin susceptibilities of Germanene layer. Green’s function approach has been implemented to find the behavior of dynamical spin susceptibilities of Germanene layer within linear response theoryand in the presence of magnetic field and spin-orbit coupling at finite temperature. Our results show the magnetic excitation mode for both longitudinal and transverse components of spin tends to higher frequencies with spin-orbit coupling strength. Moreover the frequency positions of sharp peaks in longitudinal dynamical spin susceptibility are not affected by variation of magnetic field while the peaks in transverse dynamical susceptibility moves to lower frequencies with magnetic field. The effects of electron doping on frequency behaviors of spin susceptibilities have been addressed in details. Finally the temperature dependence of static spin structure factors due to the effects of spin-orbit coupling, magnetic field and chemical potential has been studied.

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Spin Structure Factors of Doped Monolayer Germanene in the Presence of Spin-Orbit Coupling

10.21203/rs.3.rs-139403/v1 ◽

2021 ◽

Author(s):

hamed rezania ◽

farshad azizi

Keyword(s):

Magnetic Field ◽

Spin Structure ◽

Chemical Potential ◽

Linear Response Theory ◽

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Structure Factors ◽

Static Spin ◽

Dynamical Spin

Abstract In this paper, we present a Kane-Mele model in the presence of magnetic field and next nearest neighbors hopping amplitudes for investigations of the spin susceptibilities of Germanene layer.Green's function approach has been implemented to find the behavior of dynamical spin susceptibilities of Germanene layer within linear response theory and in the presence of magnetic field and spin-orbit coupling at finite temperature.Our results show the magnetic excitation mode for both longitudinal and transverse components of spin tends to higher frequencies with spin-orbit coupling strength.Moreover the frequency positions of sharp peaks in longitudinal dynamical spin susceptibility are not affected by variation of magnetic field while the peaks in transverse dynamical susceptibility moves to lower frequencies with magnetic field.The effects of electron doping on frequency behaviors of spin susceptibilities have been addressed in details.Finally the temperature dependence of static spin structure factors due to the effects of spin-orbit coupling, magnetic field and chemical potential has been studied.

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Superradiant phase transition with cavity-assisted dynamical spin-orbit coupling

Physical Review A ◽

10.1103/physreva.103.053318 ◽

2021 ◽

Vol 103 (5) ◽

Author(s):

Ying Lei ◽

Shaoliang Zhang

Keyword(s):

Phase Transition ◽

Orbit Coupling ◽

Spin Orbit Coupling ◽

Spin Orbit ◽

Dynamical Spin ◽

Superradiant Phase

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

10.21203/rs.3.rs-529388/v1 ◽

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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