TRANSPORT PROPERTIES OF TUNNEL-COUPLED ONE-DIMENSIONAL CHANNELS FROM AN ELECTRON BILAYER SYSTEM IN PERPENDICULAR MAGNETIC FIELD

2009 ◽  
Vol 23 (12n13) ◽  
pp. 2910-2914 ◽  
Author(s):  
S. S. BUCHHOLZ ◽  
S. F. FISCHER ◽  
U. KUNZE ◽  
D. SCHUH ◽  
G. ABSTREITER
Keyword(s):  
Magnetic Field ◽  
Transport Properties ◽  
Quantum Hall ◽  
Quantum Point Contacts ◽  
Perpendicular Magnetic Field ◽  
Point Contacts ◽  
One Dimensional ◽  
Bilayer System ◽  
Quantum Point ◽  
Landau Level Mixing

In a tunnel coupled GaAs / AlGaAs electron bilayer system (BLS), we compare transport measurements of 1D quantum Hall (QH) edge channels with lithographically defined quantum point contacts (QPCs). The electron densities in both systems can be varied by a top-gate. In a perpendicular magnetic field, Landau level mixing is observed in the QH regime, and indications of crossings of spin split QPC subbands are detected.

scholarly journals New signatures of the spin gap in quantum point contacts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
K. L. Hudson ◽  
A. Srinivasan ◽  
O. Goulko ◽  
J. Adam ◽  
Q. Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Quantum Point Contacts ◽  
Spin Orbit ◽  
Point Contacts ◽  
Spin Gap ◽  
One Dimensional ◽  
Topological Quantum ◽  
Potential Applications ◽  
Quantum Point ◽  
P Type

AbstractOne dimensional semiconductor systems with strong spin-orbit interaction are both of fundamental interest and have potential applications to topological quantum computing. Applying a magnetic field can open a spin gap, a pre-requisite for Majorana zero modes. The spin gap is predicted to manifest as a field dependent dip on the first 1D conductance plateau. However, disorder and interaction effects make identifying spin gap signatures challenging. Here we study experimentally and numerically the 1D channel in a series of low disorder p-type GaAs quantum point contacts, where spin-orbit and hole-hole interactions are strong. We demonstrate an alternative signature for probing spin gaps, which is insensitive to disorder, based on the linear and non-linear response to the orientation of the applied magnetic field, and extract a spin-orbit gap ΔE ≈ 500 μeV. This approach could enable one-dimensional hole systems to be developed as a scalable and reproducible platform for topological quantum applications.

Different Transmission Regimes of Two Quantum Point Contacts in a Magnetic Field

1995 ◽  
Vol 5 (9) ◽  
pp. 1257-1262
Author(s):  
V. Marigliano Ramaglia ◽  
F. Ventriglia ◽  
G. P. Zucchelli
Keyword(s):  
Magnetic Field ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Quantum Point

scholarly journals Anomalous integer quantum Hall effect in the ballistic regime with quantum point contacts

1989 ◽  
Vol 62 (10) ◽  
pp. 1181-1184 ◽  
Author(s):  
B. J. van Wees ◽  
E. M. M. Willems ◽  
C. J. P. M. Harmans ◽  
C. W. J. Beenakker ◽  
H. van Houten ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Ballistic Regime ◽  
Integer Quantum Hall Effect ◽  
Integer Quantum ◽  
Quantum Point

Low-frequency noise of quantum point contacts in the ballistic and quantum Hall regime

1991 ◽  
Vol 175 (1-3) ◽  
pp. 213-216 ◽  
Author(s):  
F. Liefrink ◽  
A.J. Scholten ◽  
C. Dekker ◽  
R. Eppenga ◽  
H. van Houten ◽  
...  
Keyword(s):  
Quantum Hall ◽  
Low Frequency ◽  
Frequency Noise ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Low Frequency Noise ◽  
Quantum Hall Regime ◽  
Hall Regime ◽  
Quantum Point
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