From quantum point contacts to quantum wires: Density-functional calculations with exchange and correlation effects

2006 ◽  
Vol 74 (23) ◽  
Author(s):  
Peter Jaksch ◽  
Irina Yakimenko ◽  
Karl-Fredrik Berggren
Keyword(s):  
Density Functional Calculations ◽  
Density Functional ◽  
Quantum Wires ◽  
Quantum Point Contacts ◽  
Correlation Effects ◽  
Point Contacts ◽  
Quantum Point ◽  
Exchange And Correlation

scholarly journals Differential thermopower images as a probe of many-body effects in quantum point contacts

2021 ◽  
Author(s):  
Yuan Ren ◽  
Joshua Folk ◽  
Yigal Meir ◽  
Tomaz Rejec ◽  
Werner Wegscheider
Keyword(s):  
Density Functional ◽  
Chemical Potential ◽  
Local Density ◽  
Equilibrium Density ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Many Body ◽  
Quantum Point ◽  
Many Body Effects ◽  
Non Equilibrium

Abstract Mesoscopic circuit elements such as quantum dots and quantum point contacts (QPCs) offer a uniquely controllable platform for engineering complex quantum devices, whose tunability makes them ideal for generating and investigating interacting quantum systems. However, the conductance measurements commonly employed in mesoscopics experiments are poorly suited to discerning correlated phenomena from those of single-particle origin. Here, we introduce non-equilibrium thermopower measurements as a novel approach to probing the local density of states (LDOS), offering an energy-resolved readout of many-body effects. We combine differential thermopower measurements with non-equilibrium density functional theory (DFT) to both confirm the presence of a localized state at the saddle point of a QPC and reveal secondary states that emerge wherever the reservoir chemical potential intersects the gate-induced potential barrier. These experiments establish differential thermopower imaging as a robust and general approach to exploring quantum many-body effects in mesoscopic circuits.

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

Double-Channel Electron Transport in Suspended Quantum Point Contacts with in-Plane Side Gates

2020 ◽  
Vol 54 (12) ◽  
pp. 1605-1610
Author(s):  
D. A. Pokhabov ◽  
A. G. Pogosov ◽  
E. Yu. Zhdanov ◽  
A. K. Bakarov ◽  
A. A. Shklyaev
Keyword(s):  
Electron Transport ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Quantum Point ◽  
Double Channel

Resonant detection of microwave radiation in a circular two-dimensional electron system with quantum point contacts

2005 ◽  
Vol 87 (9) ◽  
pp. 092107 ◽  
Author(s):  
P. S. Dorozhkin ◽  
S. V. Tovstonog ◽  
S. A. Mikhailov ◽  
I. V. Kukushkin ◽  
J. H. Smet ◽  
...  
Keyword(s):  
Microwave Radiation ◽  
Electron System ◽  
Quantum Point Contacts ◽  
Two Dimensional ◽  
Point Contacts ◽  
Dimensional Electron ◽  
Dimensional Electron System ◽  
Quantum Point
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