Metallic network of topological domain walls

Hou, Tao; Ren, Yafei; Quan, Yujie; Jung, Jeil; Ren, Wei; Qiao, Zhenhua

doi:10.1103/physrevb.101.201403

Cited by 23 publications

(14 citation statements)

References 42 publications

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“…The spontaneous polarization of ferroelectric domains is found to be bistable, it can be affected by high external electric field 21 . Scattering of the charge carriers on the domain walls is known to provide noticeable contribution to the sample resistance 22 . Thus, coexistence of metallic and ferroelectric properties should produce new physical effects 23 for electron transport in TMDCs, and, therefore, it should be important for nanoelectronic applications.…”

Section: Introductionmentioning

confidence: 99%

Evidence of the ferroelectric polarization in charge transport through WTe$_2$ Weyl semimetal surface

Orlova,

Ryshkov,

Timonina

et al. 2020

Preprint

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We investigate electron transport along the surface of WTe2 three-dimensional single crystals, which are characterized by coexistence of Weyl semimetal conductivity and ferroelectricity at room temperature. We find that non-linear behavior of dV /dI(I) WTe2 differential resistance is accompanied by slow relaxation process, which appears as the dV /dI(I) dependence on the sign of the current change. This observation is confirmed by direct investigation of time-dependent relaxation curves. While strongly non-linear differential resistance should be expected for the zero-gap WTe2, the slow relaxation in transport is very unusual for well-conducting semimetals at room temperature. We establish, that non-monotonous dependence of the amplitude of the effect on driving current ∆dV /dI(I) well corresponds to the known Sawyer-Tower's ferroelectric hysteresis loop. This conclusion is also confirmed by gate voltage dependencies, so our results can be understood as a direct demonstration of WTe2 ferroelectric polarization in charge transport experiment.

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Section: Introductionmentioning

confidence: 99%

Evidence of the ferroelectric polarization in charge transport through WTe$_2$ Weyl semimetal surface

Orlova,

Ryshkov,

Timonina

et al. 2020

Preprint

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“…3 suggest that plasmons in TBG may be described by a network model [63], similar to that used to describe the low-energy dispersion relation of the electronic system [43,64]. We thus expect only weak dependence on the carrier density in contrast to its electronic counterpart [44].…”

mentioning

confidence: 81%

“…At the interface between the AB and BA regions, and because of the difference in band topology, two EES per spin and valley appear [26,34,35], with opposite propagation direction in opposite valleys, which has been experimentally proven [36][37][38][39][40]. In TBGs the existence of a network of EES encircling the triangular regions with AB and BA stacking has been predicted [41][42][43][44][45][46] and recently experimentally observed [47].…”

mentioning

confidence: 85%

Plasmonic Dirac Cone in Twisted Bilayer Graphene

et al. 2020

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We discuss plasmons of biased twisted bilayer graphene when the Fermi level lies inside the gap. The collective excitations are a network of chiral edge plasmons (CEP) entirely composed of excitations in the topological electronic edge states that appear at the AB-BA interfaces. The CEP form a hexagonal network with a unique energy scale ϵ p ¼ ðe 2 Þ=ðϵ 0 ϵt 0 Þ with t 0 the moiré lattice constant and ϵ the dielectric constant. From the dielectric matrix we obtain the plasmon spectra that has two main characteristics: (i) a diverging density of states at zero energy, and (ii) the presence of a plasmonic Dirac cone at ℏω ∼ ϵ p =2 with sound velocity v D ¼ 0.0075c, which is formed by zigzag and armchair current oscillations. A network model reveals that the antisymmetry of the plasmon bands implies that CEP scatter at the hexagon vertices maximally in the deflected chiral outgoing directions, with a current ratio of 4=9 into each of the deflected directions and 1=9 into the forward one. We show that scanning near-field microscopy should be able to observe the predicted plasmonic Dirac cone and its broken symmetry phases.

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“…In addition to the flatband electronic structure at magic angle, the minimally twisted bilayer graphene (mTBLG) with a tiny twist angle ( 1 • ) can realize a network of one-dimensional (1D) conducting states in the presence of a perpendicular electric field [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. [See Fig.…”

Section: Introductionmentioning

confidence: 99%

Charge density wave and finite-temperature transport in minimally twisted bilayer graphene

Chou,

Wu,

2021

Preprint

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We study phenomena driven by electron-electron interactions in the minimally twisted bilayer graphene (mTBLG) with a perpendicular electric field. The low-energy degrees of freedom in mT-BLG are governed by a network of one-dimensional domain-wall states, described by two channels of one-dimensional linearly dispersing spin-1/2 fermions. We show that the interaction can realize a spin-gapped inter-channel charge density wave (CDW) state at low temperatures, forming a "Coulomb drag" between the channels and leaving only one charge conducting mode. For sufficiently high temperatures, power-law-in-temperature resistivity emerges from the charge umklapp scatterings within a domain wall. Remarkably, the presence of the CDW states can strengthen the charge umklapp scattering and induce a resistivity minimum at an intermediate temperature corresponding to the CDW correlation energy. We further discuss the conditions that resistivity of the network is dominated by the domain walls. In particular, the power-law-in-temperature resistivity results can apply to other systems that manifest topological domain-wall structures.

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Metallic network of topological domain walls

Cited by 23 publications

References 42 publications

Evidence of the ferroelectric polarization in charge transport through WTe$_2$ Weyl semimetal surface

Evidence of the ferroelectric polarization in charge transport through WTe$_2$ Weyl semimetal surface

Plasmonic Dirac Cone in Twisted Bilayer Graphene

Charge density wave and finite-temperature transport in minimally twisted bilayer graphene

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