scholarly journals Composite fermion states around the two-dimensional hole Landau level filling factor 32 in tilted magnetic fields

2017 ◽  
Vol 95 (15) ◽  
Author(s):  
Po Zhang ◽  
Ruiyuan Liu ◽  
Rui-Rui Du ◽  
L. N. Pfeiffer ◽  
K. W. West
Keyword(s):  
Magnetic Fields ◽  
Landau Level ◽  
Filling Factor ◽  
Two Dimensional ◽  
Composite Fermion

scholarly journals Quantum Hall–based superconducting interference device

2019 ◽  
Vol 5 (9) ◽  
pp. eaaw8693 ◽  
Author(s):  
Andrew Seredinski ◽  
Anne W. Draelos ◽  
Ethan G. Arnault ◽  
Ming-Tso Wei ◽  
Hengming Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Josephson Junction ◽  
Landau Level ◽  
Carrier Density ◽  
Filling Factor ◽  
Quantum Hall ◽  
Edge States ◽  
Highly Efficient ◽  
Wide Range

We present a study of a graphene-based Josephson junction with dedicated side gates carved from the same sheet of graphene as the junction itself. These side gates are highly efficient and allow us to modulate carrier density along either edge of the junction in a wide range. In particular, in magnetic fields in the 1- to 2-T range, we are able to populate the next Landau level, resulting in Hall plateaus with conductance that differs from the bulk filling factor. When counter-propagating quantum Hall edge states are introduced along either edge, we observe a supercurrent localized along that edge of the junction. Here, we study these supercurrents as a function of magnetic field and carrier density.

Subband-Landau level coupling in a two-dimensional electron gas in tilted magnetic fields

1986 ◽  
Vol 19 (5) ◽  
pp. L107-L112 ◽  
Author(s):  
M A Brummell ◽  
M A Hopkins ◽  
R J Nicholas ◽  
J C Portal ◽  
K Y Cheng ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Landau Level ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Dimensional Electron Gas

Subband-Landau level coupling in a two-dimensional electron gas in tilted magnetic fields

1986 ◽  
Vol 19 (24) ◽  
pp. L545-L545
Author(s):  
M A Brummell ◽  
M A Hopkins ◽  
R J Nicholas ◽  
J C Portal ◽  
K Y Cheng ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Landau Level ◽  
Electron Gas ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Dimensional Electron Gas

SPIN RESOLVED SUBBAND-LANDAU-LEVEL COUPLING AND ELECTRON-HOLE COUPLING IN InAs/AlGaSbAs QUANTUM WELL

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2905-2909
Author(s):  
TAKAHIDE YOSHIDA ◽  
KENICHI OTO ◽  
SHUICHI ISHIDA ◽  
HIROTAKA GEKA ◽  
ICHIRO SHIBASAKI
Keyword(s):  
Magnetic Fields ◽  
Quantum Well ◽  
Hall Effect ◽  
Transport Properties ◽  
Landau Level ◽  
Filling Factor ◽  
Lattice Mismatch ◽  
High Magnetic Fields ◽  
Electron Hole ◽  
Magneto Resistance

We have investigated the magneto-transport properties in InAs / AlGaSbAs quantum well (QW), where the lattice mismatch is less than 0.5%. In tilted magnetic fields, the spin-resolved subband-Landau-level coupling has been clearly observed in the magneto-resistance due to the large g -factor of this QW. An anomaly in the Hall effect has been observed at high magnetic fields of the filling factor being less than unity, which is caused by the coexistence of electrons and holes in the system.

MAGNETIZATION OF A BILAYER 2D ELECTRON GAS

2004 ◽  
Vol 18 (27n29) ◽  
pp. 3665-3670 ◽  
Author(s):  
I. M. A. BOMINAAR-SILKENS ◽  
M. R. SCHAAPMAN ◽  
U. ZEITLER ◽  
P. C. M. CHRISTIANEN ◽  
J. C. MAAN ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Landau Level ◽  
Filling Factor ◽  
Electron Gas ◽  
Single Layer ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Two Dimensional Electron Gas ◽  
Torque Magnetometry ◽  
Dimensional Electron Gas

We present torque-magnetometry measurements of a bilayer two-dimensional electron gas (2DEG) with an inter-well barrier thin enough to enable a strong coupling between the quantum wells. We observe magnetization steps related to symmetric–anti-symmetric (SAS) transitions. Increasing the in-plane magnetic field leads to a reduction of the SAS splitting. Surprisingly, the heights of the magnetization steps related to Landau-level transitions are reduced relative to those measured for single-layer 2DEGs, suggesting that an in-plane magnetization component plays a role. Finally, at total filling factor ν=4, we observe an unidentified magnetization peak superposed upon the Landau-level step.

SPIN-ORBIT COUPLING OF TWO-DIMENSIONAL ELECTRONS AND LANDAU LEVELS FILLING FACTOR IN FRACTIONAL QUANTUM HALL EFFECT

2021 ◽  
Vol 77 ◽  
pp. 130-140
Author(s):  
A. A. Kornilovich ◽  
◽  
V. G. Litvinov ◽  
Keyword(s):  
Hall Effect ◽  
Landau Level ◽  
Quantum Hall Effect ◽  
Filling Factor ◽  
Quantum Hall ◽  
Fractional Quantum Hall Effect ◽  
Contactless Method ◽  
Two Dimensional ◽  
Fractional Quantum ◽  
Fractional Quantum Hall

A mechanism for pairing and joining two-dimensional electron clusters in a strong quantizing magnetic field is proposed. The aim of this work is to obtain the dependence of the filling factor on the Landau level number N the resulting spin S and magnetic mL quantum numbers determined by the L-S bond of twodimensional electrons. A contactless method for determining the Landau level filling factor  has been developed. An interpretation of the fractional quantum Hall effect is given.

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