scholarly journals Enhanced quantum oscillations in Kondo insulators

2020 ◽  
Vol 101 (11) ◽  
Author(s):  
Yen-Wen Lu ◽  
Po-Hao Chou ◽  
Chung-Hou Chung ◽  
Ting-Kuo Lee ◽  
Chung-Yu Mou
Keyword(s):  
Quantum Oscillations ◽  
Kondo Insulators

scholarly journals Quantum oscillations in strongly correlated topological Kondo insulators

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
Robert Peters ◽  
Tsuneya Yoshida ◽  
Norio Kawakami
Keyword(s):  
Strongly Correlated ◽  
Quantum Oscillations ◽  
Kondo Insulators

scholarly journals Shadow surface states in topological Kondo insulators

2021 ◽  
Author(s):  
Areg Ghazaryan ◽  
Emilian Nica ◽  
Onur Erten ◽  
Pouyan Ghaemi
Keyword(s):  
High Frequency ◽  
Dirac Point ◽  
Chemical Potential ◽  
Surface States ◽  
Support Surface ◽  
Finite Frequency ◽  
Fermi Surfaces ◽  
Quantum Oscillations ◽  
Kondo Insulators ◽  
Out Of Plane

Abstract The surface states of 3D topological insulators in general have negligible quantum oscillations when the chemical potential is tuned to the Dirac points. In contrast, we find that topological Kondo insulators can support surface states with an arbitrarily large Fermi surfaces when the chemical potential is pinned to the Dirac point. We illustrate that these Fermi surfaces give rise to finite-frequency quantum oscillations, which can become comparable to the extremal area of the unhybridized bulk bands. We show that this occurs when the crystal symmetry is lowered from cubic to tetragonal in a minimal two-orbital model. We label such surface modes as `shadow surface states'. Moreover, we show that the sufficient NNN out-of-plane hybridization leading to shadow surface states can be self-consistently stabilized for tetragonal topological Kondo insulators. Consequently, shadow surface states provide an important example of high-frequency quantum oscillations beyond the context of cubic topological Kondo insulators.

scholarly journals Fermi surface of the skutterudite CoSb3 : Quantum oscillations and band-structure calculations

2021 ◽  
Vol 103 (8) ◽  
Author(s):  
M. Naumann ◽  
P. Mokhtari ◽  
Z. Medvecka ◽  
F. Arnold ◽  
M. Pillaca ◽  
...  
Keyword(s):  
Band Structure ◽  
Fermi Surface ◽  
Quantum Oscillations ◽  
Band Structure Calculations ◽  
Structure Calculations

scholarly journals Layer- and gate-tunable spin-orbit coupling in a high-mobility few-layer semiconductor

2021 ◽  
Vol 7 (5) ◽  
pp. eabe2892
Author(s):  
Dmitry Shcherbakov ◽  
Petr Stepanov ◽  
Shahriar Memaran ◽  
Yaxian Wang ◽  
Yan Xin ◽  
...  
Keyword(s):  
Electric Field ◽  
High Mobility ◽  
Orbit Coupling ◽  
Spin Splitting ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Quantum Oscillations ◽  
Out Of Plane ◽  
Order Of Magnitude ◽  
Spin Degeneracy

Spin-orbit coupling (SOC) is a relativistic effect, where an electron moving in an electric field experiences an effective magnetic field in its rest frame. In crystals without inversion symmetry, it lifts the spin degeneracy and leads to many magnetic, spintronic, and topological phenomena and applications. In bulk materials, SOC strength is a constant. Here, we demonstrate SOC and intrinsic spin splitting in atomically thin InSe, which can be modified over a broad range. From quantum oscillations, we establish that the SOC parameter α is thickness dependent; it can be continuously modulated by an out-of-plane electric field, achieving intrinsic spin splitting tunable between 0 and 20 meV. Unexpectedly, α could be enhanced by an order of magnitude in some devices, suggesting that SOC can be further manipulated. Our work highlights the extraordinary tunability of SOC in 2D materials, which can be harnessed for in operando spintronic and topological devices and applications.

Thermal transport, magnetism, and quantum oscillations in Weyl semimetal BaMnSb2

2020 ◽  
Vol 4 (6) ◽  
Author(s):  
Silu Huang ◽  
Lingyi Xing ◽  
Ramakanta Chapai ◽  
Roshan Nepal ◽  
Rongying Jin
Keyword(s):  
Thermal Transport ◽  
Quantum Oscillations ◽  
Weyl Semimetal

scholarly journals Critical Ising modes in low-dimensional Kondo insulators

1999 ◽  
Vol 60 (12) ◽  
pp. 9116-9121 ◽  
Author(s):  
Karyn Le Hur
Keyword(s):  
Kondo Insulators ◽  
Low Dimensional

scholarly journals Theory of topological Kondo insulators

2012 ◽  
Vol 85 (4) ◽  
Author(s):  
Maxim Dzero ◽  
Kai Sun ◽  
Piers Coleman ◽  
Victor Galitski
Keyword(s):  
Kondo Insulators
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