Tunable Dirac points and high spin polarization in ferromagnetic-strain graphene superlattices

Wu, Qing‐Ping; Liu, Zhengfang; Chen, Ai-Xi; Xiao, Xunwen; Miao, Guo‐Xing

doi:10.1038/s41598-017-14948-y

Cited by 12 publications

(4 citation statements)

References 34 publications

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“…It should be pointed out that the negative shift is associated with the Klein tunneling effect. [35][36][37][38] In order to explore the effect of combined modulation, the calculated results for GHL shift are shown in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

Goos–Hänchen-like shift related to spin and valley polarization in ferromagnetic silicene*

Liu¹,

Liu²,

Zhang³

et al. 2021

Chinese Phys. B

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We study the Goos-Hänchen-like shift of single silicene barrier under the external perpendicular electric field, offresonant circularly polarized light and the exchange field modulation using the stationary-phase method. The results show that the Goos-Hänchen-like shift of silicene resulting from the external perpendicular electric field does not have the characteristics of spin or valley polarization, while that from off-resonant circularly polarized light or the exchange field is spin-polarized. More importantly, the combined effect of the external perpendicular electric field and the exchange field or off-resonant circularly polarized light can cause the Goos-Hänchen-like shift of the system to be spin and valley polarized. It is particularly worth noting that when the three modulations are considered at the same time, as the exchange field changes, the system will have a positive or negative Goos-Hänchen-like shift.

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Section: Resultsmentioning

confidence: 99%

Goos–Hänchen-like shift related to spin and valley polarization in ferromagnetic silicene*

Liu¹,

Liu²,

Zhang³

et al. 2021

Chinese Phys. B

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“…As in the case of semiconductor superlattices, most of the works in graphene superlattices are devoted to the study of single-period structures. In fact, there are extensive studies in electrostatic 17 – 20 , 20 – 23 , magnetic 24 – 29 , and strain 30 – 34 graphene superlattices. Regarding biperiodic superlattices in graphene the few works found in the literature address aspects related to the electron transport, band structure, and resonant peak splitting 35 – 38 .…”

Section: Introductionmentioning

confidence: 99%

Biperiodic superlattices and transparent states in graphene

Alvarado-Goytia

Rodríguez-González

Martı́nez-Orozco

et al. 2022

Sci Rep

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The transmission and transport properties of biperiodic graphene superlattices are studied theoretically. Special attention is paid to the so-called transparent states of biperiodic superlattices. A Dirac-like Hamiltonian is used to describe the charge carriers in graphene. The transfer matrix method and the Landauer–Büttiker formalism are implemented to obtain the transmittance and conductance, respectively. Similar results to those reported for Schrödinger electrons are obtained. However, in the case of Dirac electrons the splitted bands and the transparent states associated to the biperiodicity depend strongly on the angle of incidence as well as the character of the charge carriers. In fact, the dynamic of the splitted bands and transparent states is inverted for holes. The origin of transparent states is unveiled by obtaining an analytic expression for the transmittance. It is found that resonant transmission through single and double barriers gives rise to transparent states. Regarding the transport properties, it is possible to identify the fundamental changes caused by the biperiodicity. In particular, it is found a splitting, shifting, and diminishment of the conductance peaks with respect to the case of regular periodicity. This opens the door to corroborate experimentally the fundamental characteristics of biperiodic gated graphene superlattices through transport measurements.

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“…Also, it was shown experimentally that graphene can sustain strain up to 25% [19]. In recent years, the electronic, spintronic and valleytronic properties of strained graphene structure have gained much attention [20][21][22][23][24][25][26][27][28][29]. Cao et al [22] showed that when the armchair direction uniaxial strain is applied to a graphene junction, the transmission probability symmetry breaks with respect to the angle of incidence.…”

Section: Introductionmentioning

confidence: 99%

“…Cao et al [22] showed that when the armchair direction uniaxial strain is applied to a graphene junction, the transmission probability symmetry breaks with respect to the angle of incidence. Spin-dependent transport properties of graphene superlattices under strain were investigated by Wu et al [23]. They demonstrated that high spin polarization can be achieved in such a system due to the presence of strain.…”

Section: Introductionmentioning

confidence: 99%

Tunneling time and transmission properties in strained graphene with a time-oscillating potential

Sattari

Mirershadi

2020

Phys. Scr.

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We investigate the transport properties, the group delay time and the Hartman effect through the graphene electrostatic barrier with a time-dependent oscillating potential, under zigzag and armchair strains. In this work, we demonstrated that as the armchair-direction strain is applied, the transmission has a gap for the sidebands, as well as the central band. The transmission gap strongly depends on strain strength and barrier height. We found that the transmission probability can be controlled by adjusting the amplitude of the time-oscillating potential. The transmission probability for the nonzero angle of incidence, unlike the zero angles of incidence, depends on the sign of n for the nth sideband. Also, the group delay time is sensitive to the order of the sidebands. The barrier width is very important parameter in controlling the group delay time of various sidebands. Remarkably, the Hartman effect, for the armchair strain, in contrast to the zigzag direction strain, can be observed at the zero angles of incidence, for both the sidebands and the central band.

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Tunable Dirac points and high spin polarization in ferromagnetic-strain graphene superlattices

Cited by 12 publications

References 34 publications

Goos–Hänchen-like shift related to spin and valley polarization in ferromagnetic silicene*

Goos–Hänchen-like shift related to spin and valley polarization in ferromagnetic silicene*

Biperiodic superlattices and transparent states in graphene

Tunneling time and transmission properties in strained graphene with a time-oscillating potential

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