Generation of strain-induced pseudo-magnetic field in a doped type-II Weyl semimetal

Kamboj, Suman; Rana, Partha Sarathi; Sirohi, Anshu; Vasdev, Aastha; Mandal, Manasi; Marik, Sourav; Singh, R. P.; Das, Tanmoy; Sheet, Goutam

doi:10.1103/physrevb.100.115105

Cited by 25 publications

(16 citation statements)

References 45 publications

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“…We are confident that the conductance scaling uncovered in this work can be observed in experiment, considering the recent efforts in manufacturing microstructured Weyl semimetals [38], creating strain-induced fields in type-II Weyl semimetals [39], and transport experiments in Dirac nanowires [40,41]. As our results rely on time-reversal symmetry-breaking materials, magneticexchange induced Weyl semimetals [42,43] are promising platforms for experiments.…”

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confidence: 61%

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Anomalous conductance scaling in strained Weyl semimetals

Behrends

Ilan

Bardarson

2019

Phys. Rev. Research

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Magnetotransport provides key experimental signatures in Weyl semimetals. The longitudinal magnetoresistance is linked to the chiral anomaly, and the transversal magnetoresistance to the dominant charge relaxation mechanism. Axial magnetic fields that act with opposite sign on opposite chiralities facilitate new transport experiments that probe the low-energy Weyl nodes. As recently realized, these axial fields can be achieved by straining samples or adding inhomogeneities to them. Here, we identify a robust signature of axial magnetic fields: an anomalous scaling of the conductance in the diffusive ultraquantum regime. In particular, we demonstrate that the longitudinal conductivity in the ultraquantum regime of a disordered Weyl semimetal subjected to an axial magnetic field increases with both the field strength and sample width due to a spatial separation of charge carriers. We contrast axial magnetic with real magnetic fields to clearly distinguish the different behavior of the conductance. Our results rely on numerical tight-binding simulations and are supported by analytical arguments. We argue that the spatial separation of charge carriers can be used for directed currents in microstructured electronic devices. arXiv:1906.08277v1 [cond-mat.mes-hall]

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supporting

confidence: 61%

“…In Fig. 9, we show the imaginary part of the self-energy correction (39). Scattering from states deep in the bulk to the surface is exponentially suppressed due to the exponential localization of the bulk zeroth Landau levels.…”

Section: Multiple Scattering Eventsmentioning

confidence: 99%

Anomalous conductance scaling in strained Weyl semimetals

Behrends

Ilan

Bardarson

2019

Phys. Rev. Research

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“…The construction of elastic gauge fields in three dimensional (3D) Weyl semimetals (WSM) in [27] has been followed by a number of works analyzing their physical consequences [28][29][30][31][32][33][34][35][36][37][38]. An experimental realization of elastic gauge fields in a WSM has appeared recently [39]. The most interesting feature of these elastic gauge fields is that they couple to the two chiralities with opposite signs, i. e., they are axial pseudo-gauge fields.…”

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confidence: 99%

Chiral sound waves in strained Weyl semimetals

Chernodub

Vozmediano

2019

Phys. Rev. Research

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We show that a strained wire of a Weyl semimetal supports a new type of gapless excitation, the chiral sound wave (CSW). It is a longitudinal charge density wave analog to the chiral magnetic wave predicted in the quark-gluon plasma but driven by an elastic axial pseudo-magnetic field. It involves the axial-axial-axial contribution to the chiral anomaly which couples the chiral charge density to the elastic axial gauge field. The chiral sound is unidirectional: it propagates along the elastic magnetic field and not in the opposite direction. The CSW may propagate for long distances as it does not couple directly to quickly dissipating electromagnetic plasmons, while its damping is controlled by the slow chirality flip rate. We propose an experimental setup to directly detect the chiral sound, which is excited by mechanical vibrations of the crystal lattice in the GHz frequency range. Our findings contribute to a new trend, the chiral acoustics, in strained Weyl semimetals. The low energy electronic excitations of Dirac andWeyl semimetals in three dimensions are Weyl fermions [1][2][3][4][5][6]. Despite the complexity of the band structure of real materials they have been providing evidences of high energy phenomena often related to quantum anomalies, in particular, experimental evidences for the chiral anomaly [7][8][9][10][11] and the chiral magnetic effect [12] have been reported in semimetals [13][14][15][16][17]. More recently, the gravitational [18,19], conformal [20-23] and torsional [24] anomalies have also been incorporated to the play. Directly related to the chiral anomaly there is a prediction in the physics of the quark-gluon plasma, of the existence of a collective excitation called chiral magnetic wave [25] which have eluded experimental detection so far due to its strong hybridization with the plasmons [26]. The CMW is a collective, gapless excitation of the electronic fluid which corresponds to a coherent propagation of electric and chiral density waves coupled together by the chiral magnetic effect. In this work we propose a new type of gapless excitation in strained Weyl semimetals, the chiral sound wave which can be easier to detect than its magnetic counterpart.

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“…Strain-induced pseudo-magnetic field was first experimentally demonstrated in 2D graphene systems [31,32]. Some experimental evidence of strain induced pseudo-magnetic field has also been found in certain 3D Weyl semimetal systems [33]. In addition, significant experimental progress has been achieved in observing chiral zero Landau levels induced by pseudogauge field in photonic and acoustic Weyl metamaterials [34,35].…”

Section: A Chiral Zero Modes At Magnetic Vortex Cores In Magnetic Wey...mentioning

confidence: 98%

Pseudo-gauge Fields in Dirac and Weyl Materials

Yu,

Liu

2021

Preprint

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Electrons in low-temperature solids are governed by the non-relativistic Schrödinger equation, since the electron velocities are much slower than the speed of light. Remarkably, the low-energy quasi-particles given by electrons in various materials can behave as relativistic Dirac/Weyl fermions that obey the relativistic Dirac/Weyl equation. We refer to these materials as "Dirac/Weyl materials", which provide a tunable platform to test relativistic quantum phenomena in table-top experiments. More interestingly, different types of physical fields in these Weyl/Dirac materials, such as magnetic fluctuations, lattice vibration, strain, and material inhomogeneity, can couple to the "relativistic" quasi-particles in a similar way as the U (1) gauge coupling. As these fields do not have gauge-invariant dynamics in general, we refer to them as "pseudo-gauge fields". In this chapter, we overview the concept and physical consequences of pseudo-gauge fields in Weyl/Dirac materials. In particular, we will demonstrate that pseudo-gauge fields can provide a unified understanding of a variety of physical phenomena, including chiral zero modes inside a magnetic vortex core of magnetic Weyl semimetals, a giant current response at magnetic resonance in magnetic topological insulators, and piezo-electromagnetic response in time-reversal invariant systems. It turns out that these phenomena are deeply related to various concepts in high-energy physics, such as chiral anomaly and axion electrodynamics.

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Generation of strain-induced pseudo-magnetic field in a doped type-II Weyl semimetal

Cited by 25 publications

References 45 publications

Anomalous conductance scaling in strained Weyl semimetals

Anomalous conductance scaling in strained Weyl semimetals

Chiral sound waves in strained Weyl semimetals

Pseudo-gauge Fields in Dirac and Weyl Materials

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