Oscillations of the electron energy loss rate in two-dimensional transition-metal dichalcogenides in the presence of a quantizing magnetic field

Bich, Tran N.; Kubakaddi, S. S.; Đình, Lê; Hieu, Nguyen N.; Phuc, Huynh V.

doi:10.1103/physrevb.103.235417

Cited by 8 publications

(5 citation statements)

References 56 publications

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“…We find that

shows an oscillatory behavior in accordance with the oscillations of the density of states at the Fermi level. Similar behavior for

was predicted previously in GaAs quantum wells [ 45 ] and more recently in two-dimensional transition-metal dichalcogenides [ 46 ]. The peak values of

occur when

lies close to the localized state of a LL and appear for values of

in the vicinity of

(with

).…”

Section: Resultssupporting

confidence: 87%

Quantum Oscillations of the Energy Loss Rate of Hot Electrons in Graphene at Strong Magnetic Fields

Tsaousidou

Kubakaddi

2023

Materials

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We present a theoretical model for the calculation of the energy loss rate (ELR) of hot electrons in a monolayer graphene due to their coupling with acoustic phonons at high perpendicular magnetic fields. Electrons interact with both transverse acoustic (TA) and longitudinal acoustic (LA) phonons. Numerical simulations of the ELR are performed as a function of the magnetic field, the electron temperature, the electron density, and the Landau level broadening. We find robust oscillations of the ELR as a function of the filling factor ν that originate from the oscillating density of states at the Fermi level. Screening effects on the deformation potential coupling are taken into account, and it is found that they lead to a significant reduction of ELR, especially, at low electron temperatures, Te, and high magnetic fields. At temperatures much lower than the Bloch–Grüneisen temperature, the ELR shows a Te4 dependence that is related to the unscreened electron interaction with TA acoustic phonons. Finally, our theoretical model is compared with existing experimental results and a very good quantitative agreement is found.

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“…We find that

shows an oscillatory behavior in accordance with the oscillations of the density of states at the Fermi level. Similar behavior for

was predicted previously in GaAs quantum wells [ 45 ] and more recently in two-dimensional transition-metal dichalcogenides [ 46 ]. The peak values of

occur when

lies close to the localized state of a LL and appear for values of

in the vicinity of

(with

).…”

Section: Resultssupporting

confidence: 87%

Quantum Oscillations of the Energy Loss Rate of Hot Electrons in Graphene at Strong Magnetic Fields

Tsaousidou

Kubakaddi

2023

Materials

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“…The −S g xx is found to display the oscillatory feature caused by the oscillating DoS with the magnetic field as evinced from equation ( 16) (see figure 1), where the peak positions have been pushed to the higher field region (in comparison to those of DoS) due to the effect of phonon scatterings. This result is similar to the −S g xx behavior observed in conventional 2DEG [33,36] and MLG [37], as well as the energy loss rate behavior observed in MoS 2 monolayer [68]. One interesting fact is that the contributions to the −S g xx from τ s = 1 (K↑ and/or K ′ ↓) and τ s = −1 (K↓ and/or K ′ ↑) states are clearly separated due to the lifting of the valley and spin degeneracies in MoS 2 monolayer [9].…”

Section: Resultssupporting

confidence: 87%

“…This is consistent with the phonon-drag thermopower behavior findings in graphene [37]. Our results for the −S g xx in the low-temperature regime differ from those for the mobility [26] and the electron energy loss rate [68] in MoS 2 monolayer, where the exponent is found to be δ e = 4 for unscreened DP scattering and δ e = 6 for DP and PE scatterings, respectively. In previous work evaluating for MoS 2 monolayer with B = 0, Bhargavi and Kubakaddi [25] found that the exponent δ e , in the BG regime T ≪ T BG , is exactly equal to 3 and 5 for unscreened TA-DP and screened TA-PE, respectively.…”

Section: Resultssupporting

confidence: 87%

Phonon-drag thermopower and thermoelectric performance of MoS₂ monolayer in quantizing magnetic field

Phuc¹,

Kubakaddi²,

Đình³

et al. 2022

J. Phys.: Condens. Matter

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We present a theory of phonon-drag thermopower, $S_{xx}^g$, in MoS$_2$ monolayer at a low-temperature regime in the presence of a quantizing magnetic field $B$. Our calculations for $S_{xx}^g$ consider the electron-acoustic phonon interaction via deformation potential (DP) and piezoelectric (PE) couplings for longitudinal (LA) and transverse (TA) phonon modes. The unscreened TA-DP is found to dominate $S_{xx}^g$ over other mechanisms. The $S_{xx}^g$ is found to oscillate with the magnetic field where the lifting effect of the valley and spin degeneracies in MoS$_2$ monolayer has been clearly observed. An enhanced $S_{xx}^g$ with a peak value of $\sim1$~mV~K$^{-1}$ at about \mbox{$T=10$~K} is predicted, which is closer to the zero field experimental observation. In the Bloch-Gr\"{u}neisen regime the temperature dependence of $S_{xx}^g$ gives the power-law $S_{xx}^g\propto T^{\delta_e}$, where $\delta_e$ varies marginally around 3 and 5 for unscreened and screened couplings, respectively. In addition, $S_{xx}^g$ is smaller for larger electron density $n_e$. The power factor PF is found to increase with temperature $T$, decrease with $n_e$, and oscillate with $B$. The prediction of an increase of thermal conductivity with temperature and the magnetic field is responsible for the limit of the figure of merit ($ZT$). At a particular magnetic field and temperature, $ZT$ can be maximized by optimizing electron density. By fixing $n_e=10^{12}$~cm$^{-2}$, the highest $ZT$ is found to be $0.57$ at $T=5.8$~K and $B=12.1$~T. Our findings are compared with those in graphene and MoS$_2$ for the zero-magnetic field.

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“…Since graphene was discovered experimentally, 1 2D materials with layered structures were of particular interest to the scientic community. [2][3][4] Many 2D structures have been experimentally synthesized and theoretically predicted with anomalous physical properties that differ from their bulk counterparts. [5][6][7][8][9] Among them, transition metal dichalcogenides are one of the objects that have been focused on in recent research with many prospects for applications in nanotechnology.…”

Section: Introductionmentioning

confidence: 99%

A first-principles prediction of novel Janus T′-RuXY (X/Y = S, Se, Te) monolayers: structural properties and electronic structures

Hien

2022

RSC Adv.

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Oscillations of the electron energy loss rate in two-dimensional transition-metal dichalcogenides in the presence of a quantizing magnetic field

Cited by 8 publications

References 56 publications

Quantum Oscillations of the Energy Loss Rate of Hot Electrons in Graphene at Strong Magnetic Fields

Quantum Oscillations of the Energy Loss Rate of Hot Electrons in Graphene at Strong Magnetic Fields

Phonon-drag thermopower and thermoelectric performance of MoS₂ monolayer in quantizing magnetic field

A first-principles prediction of novel Janus T′-RuXY (X/Y = S, Se, Te) monolayers: structural properties and electronic structures

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Oscillations of the electron energy loss rate in two-dimensional transition-metal dichalcogenides in the presence of a quantizing magnetic field

Cited by 8 publications

References 56 publications

Quantum Oscillations of the Energy Loss Rate of Hot Electrons in Graphene at Strong Magnetic Fields

Quantum Oscillations of the Energy Loss Rate of Hot Electrons in Graphene at Strong Magnetic Fields

Phonon-drag thermopower and thermoelectric performance of MoS2 monolayer in quantizing magnetic field

A first-principles prediction of novel Janus T′-RuXY (X/Y = S, Se, Te) monolayers: structural properties and electronic structures

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Product

Resources

About

Phonon-drag thermopower and thermoelectric performance of MoS₂ monolayer in quantizing magnetic field