scholarly journals Quantum oscillations in Weyl and Dirac semimetal ultrathin films

2016 ◽  
Vol 93 (8) ◽  
Author(s):  
Daniel Bulmash ◽  
Xiao-Liang Qi
Keyword(s):  
Ultrathin Films ◽  
Quantum Oscillations ◽  
Dirac Semimetal

Realizing topological states in type-II Dirac semimetal PdTe2: an angle-resolved photoemission and quantum oscillations study

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Jadupati Nag ◽  
Anshu Kataria ◽  
Ravi Prakash Singh ◽  
Soma Banik ◽  
Aftab Alam ◽  
...  
Keyword(s):  
Type Ii ◽  
Quantum Oscillations ◽  
Dirac Semimetal ◽  
Topological States

scholarly journals Evidence for strong electron correlations in a nonsymmorphic Dirac semimetal

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Yu-Te Hsu ◽  
Danil Prishchenko ◽  
Maarten Berben ◽  
Matija Čulo ◽  
Steffen Wiedmann ◽  
...  
Keyword(s):  
Electronic Excitations ◽  
Electron Correlations ◽  
Strong Electron ◽  
Brillouin Zone Boundary ◽  
Quantum Oscillations ◽  
Strong Electron Correlations ◽  
Dirac Semimetal ◽  
Linear Band ◽  
Iridium Oxides ◽  
New Phenomena

AbstractMetallic iridium oxides (iridates) provide a fertile playground to explore new phenomena resulting from the interplay between topological protection, spin-orbit and electron-electron interactions. To date, however, few studies of the low energy electronic excitations exist due to the difficulty in synthesising crystals with sufficiently large carrier mean-free-paths. Here, we report the observation of Shubnikov-de Haas quantum oscillations in high-quality single crystals of monoclinic SrIrO3 in magnetic fields up to 35 T. Analysis of the oscillations reveals a Fermi surface comprising multiple small pockets with effective masses up to 4.5 times larger than the calculated band mass. Ab-initio calculations reveal robust linear band-crossings at the Brillouin zone boundary, due to its non-symmorphic symmetry, and overall we find good agreement between the angular dependence of the oscillations and the theoretical expectations. Further evidence of strong electron correlations is realized through the observation of signatures of non-Fermi liquid transport as well as a large Kadowaki-Woods ratio. These collective findings, coupled with knowledge of the evolution of the electronic state across the Ruddlesden-Popper iridate series, establishes monoclinic SrIrO3 as a topological semimetal on the boundary of the Mott metal-insulator transition.

scholarly journals Vanishing quantum oscillations in Dirac semimetal ZrTe5

2018 ◽  
Vol 115 (37) ◽  
pp. 9145-9150 ◽  
Author(s):  
Jingyue Wang ◽  
Jingjing Niu ◽  
Baoming Yan ◽  
Xinqi Li ◽  
Ran Bi ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Berry Phase ◽  
Zeeman Splitting ◽  
Arbitrary Field ◽  
Quantum Oscillations ◽  
Topological Materials ◽  
Dirac Semimetal ◽  
Zero Effect ◽  
The Magnetic Field

One of the characteristics of topological materials is their nontrivial Berry phase. Experimental determination of this phase largely relies on a phase analysis of quantum oscillations. We study the angular dependence of the oscillations in a Dirac material ZrTe5 and observe a striking spin-zero effect (i.e., vanishing oscillations accompanied with a phase inversion). This indicates that the Berry phase in ZrTe5 remains nontrivial for arbitrary field direction, in contrast with previous reports. The Zeeman splitting is found to be proportional to the magnetic field based on the condition for the spin-zero effect in a Dirac band. Moreover, it is suggested that the Dirac band in ZrTe5 is likely transformed into a line node other than Weyl points for the field directions at which the spin zero occurs. The results underline a largely overlooked spin factor when determining the Berry phase from quantum oscillations.

scholarly journals Recognition of Fermi-arc states through the magnetoresistance quantum oscillations in Dirac semimetal Cd3As2 nanoplates

2017 ◽  
Vol 96 (12) ◽  
Author(s):  
Guolin Zheng ◽  
Min Wu ◽  
Hongwei Zhang ◽  
Weiwei Chu ◽  
Wenshuai Gao ◽  
...  
Keyword(s):  
Quantum Oscillations ◽  
Fermi Arc ◽  
Dirac Semimetal

scholarly journals Three-dimensional Dirac semimetal and magnetic quantum oscillations in Cd3As2

2017 ◽  
Vol 903 ◽  
pp. 012038 ◽  
Author(s):  
Filip Orbanić ◽  
Mario Novak ◽  
Nikola Biliškov ◽  
Sanda Pleslić ◽  
Ivan Kokanović
Keyword(s):  
Three Dimensional ◽  
Quantum Oscillations ◽  
Dirac Semimetal ◽  
Magnetic Quantum Oscillations

scholarly journals Dimensional crossover and band topology evolution in ultrathin semimetallic NiTe2 films

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Joseph A. Hlevyack ◽  
Liang-Ying Feng ◽  
Meng-Kai Lin ◽  
Rovi Angelo B. Villaos ◽  
Ro-Ya Liu ◽  
...  
Keyword(s):  
Film Thickness ◽  
Ultrathin Films ◽  
Molecular Beam ◽  
Surface States ◽  
Single Layer ◽  
Dirac Fermions ◽  
Dirac Semimetal ◽  
Emergent Phenomena ◽  
Device Applications ◽  
Topological Surface

AbstractNickel ditelluride (NiTe2), a recently discovered Type-II Dirac semimetal with topological Dirac fermions near the Fermi energy, is expected to exhibit strong thickness-mediated electronic tunability and intrinsic two-gap superconductivity in the single-layer limit. Realizing such intriguing phenomena requires the fabrication of ultrathin NiTe2 films and an understanding of the underlying physics that is still under debate. By conducting experimental band mappings of ultrathin films prepared with molecular beam epitaxy, we reveal spectroscopic evidence for the dimensionality crossover of single-crystalline ultrathin NiTe2 films as a function of film thickness. As the film thickness increases from one to five layers, the gap in the conical topological surface states closes. Comparisons of experimental to first-principles results also highlight difficulties in fabricating atomically smooth single-layer NiTe2 films. Our results not only provide further impetus for studying emergent phenomena in NiTe2 but also underscore the limitations of fabricating NiTe2 films for device applications.

scholarly journals Orbit topology analyzed from π phase shift of magnetic quantum oscillations in three-dimensional Dirac semimetal

2021 ◽  
Vol 118 (29) ◽  
pp. e2023027118
Author(s):  
Sang-Eon Lee ◽  
Myeong-jun Oh ◽  
Sanghyun Ji ◽  
Jinsu Kim ◽  
Jin-Hyeon Jun ◽  
...  
Keyword(s):  
Phase Shift ◽  
Three Dimensional ◽  
Dirac Fermion ◽  
Quantum Oscillations ◽  
Dirac Semimetal ◽  
Single Orbit ◽  
Dirac Materials ◽  
Dirac Semimetals ◽  
Cyclotron Mass ◽  
Magnetic Quantum Oscillations

With the emergence of Dirac fermion physics in the field of condensed matter, magnetic quantum oscillations (MQOs) have been used to discern the topology of orbits in Dirac materials. However, many previous researchers have relied on the single-orbit Lifshitz–Kosevich (LK) formula, which overlooks the significant effect of degenerate orbits on MQOs. Since the single-orbit LK formula is valid for massless Dirac semimetals with small cyclotron masses, it is imperative to generalize the method applicable to a wide range of Dirac semimetals, whether massless or massive. This report demonstrates how spin-degenerate orbits affect the phases in MQOs of three-dimensional massive Dirac semimetal, NbSb2. With varying the direction of the magnetic field, an abrupt π phase shift is observed due to the interference between the spin-degenerate orbits. We investigate the effect of cyclotron mass on the π phase shift and verify its close relation to the phase from the Zeeman coupling. We find that the π phase shift occurs when the cyclotron mass is half of the electron mass, indicating the effective spin gyromagnetic ratio as gs = 2. Our approach is not only useful for analyzing MQOs of massless Dirac semimetals with a small cyclotron mass but also can be used for MQOs in massive Dirac materials with degenerate orbits, especially in topological materials with a sufficiently large cyclotron mass. Furthermore, this method provides a useful way to estimate the precise gs value of the material.

scholarly journals Quantum oscillations of the magnetic torque in the nodal-line Dirac semimetal ZrSiS

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
F. Orbanić ◽  
M. Novak ◽  
Z. Glumac ◽  
A. McCollam ◽  
L. Tang ◽  
...  
Keyword(s):  
Nodal Line ◽  
Magnetic Torque ◽  
Quantum Oscillations ◽  
Dirac Semimetal

scholarly journals Quantum Oscillations from Nontrivial States in Quasi-Two-Dimensional Dirac Semimetal ZrTe5 Nanowires

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Pei Yang ◽  
Wei Wang ◽  
Xiaoqian Zhang ◽  
Kejie Wang ◽  
Liang He ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Quantum Oscillations ◽  
Dirac Semimetal
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