scholarly journals Spin-valley locking and bulk quantum Hall effect in a noncentrosymmetric Dirac semimetal BaMnSb2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. Y. Liu ◽  
J. Yu ◽  
J. L. Ning ◽  
H. M. Yi ◽  
L. Miao ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Transition Metal Dichalcogenides ◽  
Quantum Hall ◽  
Tight Binding ◽  
Spin Splitting ◽  
Quantum Limit ◽  
Dirac Semimetal ◽  
Bulk Single Crystals ◽  
Metal Dichalcogenides

AbstractSpin-valley locking in monolayer transition metal dichalcogenides has attracted enormous interest, since it offers potential for valleytronic and optoelectronic applications. Such an exotic electronic state has sparsely been seen in bulk materials. Here, we report spin-valley locking in a Dirac semimetal BaMnSb2. This is revealed by comprehensive studies using first principles calculations, tight-binding and effective model analyses, angle-resolved photoemission spectroscopy measurements. Moreover, this material also exhibits a stacked quantum Hall effect (QHE). The spin-valley degeneracy extracted from the QHE is close to 2. This result, together with the Landau level spin splitting, further confirms the spin-valley locking picture. In the extreme quantum limit, we also observed a plateau in the z-axis resistance, suggestive of a two-dimensional chiral surface state present in the quantum Hall state. These findings establish BaMnSb2 as a rare platform for exploring coupled spin and valley physics in bulk single crystals and accessing 3D interacting topological states.

EXPERIMENTAL FINITE-SIZE SCALING IN THE QUANTUM HALL EFFECT

1992 ◽  
Vol 06 (01) ◽  
pp. 1-8 ◽  
Author(s):  
S. KOCH ◽  
R.J. HAUG ◽  
K. v. KLITZING ◽  
K. PLOOG
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Localization Length ◽  
Finite Size ◽  
Landau Levels ◽  
Spin Splitting ◽  
Theoretic Approach ◽  
Lowest Landau Level ◽  
Experimental Findings

The critical exponent ν of the localization length in the integral quantum Hall regime can be measured directly using small Hall-bar geometries with different sizes. We obtain a universal behaviour for the three lowest Landau levels. This is in agreement with the universality prediction of the field-theoretic approach to the metal-insulator-transition in the quantum Hall effect. The value of ν=2.3±0.1 agrees with recent numerical studies for the lowest Landau level. We review recent experimental findings on the basis of these results and discuss the situation in Landau levels where spin-splitting is not resolved.

scholarly journals Collapse of spin splitting in the quantum Hall effect

1995 ◽  
Vol 52 (24) ◽  
pp. 17366-17378 ◽  
Author(s):  
M. M. Fogler ◽  
B. I. Shklovskii
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Spin Splitting

scholarly journals Unconventional Hall response in the quantum limit of HfTe5

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Galeski ◽  
X. Zhao ◽  
R. Wawrzyńczak ◽  
T. Meng ◽  
T. Förster ◽  
...  
Keyword(s):  
Hall Effect ◽  
Landau Level ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Three Dimensional ◽  
Quantum Limit ◽  
Strong Electron ◽  
Electron Band ◽  
Lowest Landau Level ◽  
Interacting Electrons

AbstractInteracting electrons confined to their lowest Landau level in a high magnetic field can form a variety of correlated states, some of which manifest themselves in a Hall effect. Although such states have been predicted to occur in three-dimensional semimetals, a corresponding Hall response has not yet been experimentally observed. Here, we report the observation of an unconventional Hall response in the quantum limit of the bulk semimetal HfTe5, adjacent to the three-dimensional quantum Hall effect of a single electron band at low magnetic fields. The additional plateau-like feature in the Hall conductivity of the lowest Landau level is accompanied by a Shubnikov-de Haas minimum in the longitudinal electrical resistivity and its magnitude relates as 3/5 to the height of the last plateau of the three-dimensional quantum Hall effect. Our findings are consistent with strong electron-electron interactions, stabilizing an unconventional variant of the Hall effect in a three-dimensional material in the quantum limit.

scholarly journals Effects of Zeeman spin splitting on the modular symmetry in the quantum Hall effect

2005 ◽  
Vol 36 (3-6) ◽  
pp. 469-471 ◽  
Author(s):  
D.R. Hang ◽  
R.B. Dunford ◽  
Gil-Ho Kim ◽  
H.D. Yeh ◽  
C.F. Huang ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Spin Splitting

scholarly journals Tunable topology and berry curvature dipole in transition metal dichalcogenide Janus monolayers

2021 ◽  
Author(s):  
Nesta Joseph ◽  
Saswata Roy ◽  
Awadhesh Narayan
Keyword(s):  
Transition Metal ◽  
Hall Effect ◽  
Transition Metal Dichalcogenides ◽  
Tight Binding ◽  
Quantum Spin ◽  
Transition Metal Dichalcogenide ◽  
Berry Curvature ◽  
Asymmetric Structures ◽  
Non Linear ◽  
Metal Dichalcogenides

Abstract Janus transition metal dichalcogenides, with intrinsic mirror asymmetry, exhibit a wide array of interesting properties. In this work, we study Janus monolayers derived from WTe2 using first-principles and tight-binding calculations. We discover that WSeTe and WSTe are topologically trivial, in contrast to the parent quantum spin Hall insulator WTe2. Motivated by the growing interest in non-linear Hall effect, which also requires asymmetric structures, we investigate the Berry curvature and its dipole in these Janus systems and find that they exhibit strikingly large values of Berry curvature dipole, despite being in the topologically trivial phase. We track down the origin of this behaviour and put forth a low-energy massive Dirac model to understand the central features of our ab inito computations. Our predictions introduce Janus monolayers as promising new platforms for exploring as well as engineering non-linear Hall effect.

scholarly journals Thickness dependence of the quantum Hall effect in films of the three-dimensional Dirac semimetal Cd3As2

APL Materials ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 026105 ◽  
Author(s):  
Manik Goyal ◽  
Luca Galletti ◽  
Salva Salmani-Rezaie ◽  
Timo Schumann ◽  
David A. Kealhofer ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Three Dimensional ◽  
Thickness Dependence ◽  
Dirac Semimetal
Sign in / Sign up

Export Citation Format

Share Document