Conductance quantization and the 0.7x2e2/h conductance anomaly in one-dimensional hole systems

Abstract

We have studied ballistic transport in a 1D channel formed using surface gate techniques on a back-gated, high-mobility, bilayer 2D hole system. At millikelvin temperatures, robust conductance quantization is observed in the quantum wire formed in the top layer of the bilayer system, without the gate instabilities that have hampered previous studies of 1D hole systems. Using source drain bias spectroscopy, we have measured the 1D subband spacings, which are 5-10 times smaller than in comparable GaAs electron systems, but 2-3 times larger than in previous studies of 1D holes. We also report the first observation of the anomalous conductance plateau at G = 0.7 x 2e2/h in a 1D hole system.

10 pages, 3 figures

References in corpus (7)

• Quantum Transport in Semiconductor Nanostructures
• Possible Spin Polarization in a One-Dimensional Electron Gas
• The Low-Temperature Fate of the 0.7 Structure in a Point Contact: A Kondo-like Correlated State in an Open System
• Bias and temperature dependence of the 0.7 conductance anomaly in Quantum Point Contacts
• Density dependent spin polarisation in ultra low-disorder quantum wires
• Fano factor reduction on the 0.7 structure in a ballistic one-dimensional wire
• Controlled Wavefunction Mixing in a Strongly Coupled One-Dimensional Wire

Cited by in corpus (23)

• Spin dynamics in semiconductors
• Wigner crystal physics in quantum wires
• What lurks below the last plateau: Experimental studies of the 0.7 x 2e^2/h conductance anomaly in one-dimensional systems
• Zeeman splitting in ballistic hole quantum wires
• Quantized conductance in an AlAs 2D electron system quantum point contact
• Topologically non-trivial valley states in bilayer graphene quantum point contacts
• Ballistic transport in induced one-dimensional hole systems
• Spin-3/2 physics of semiconductor hole nanowires: Valence-band mixing and tunable interplay between bulk-material and orbital bound-state spin splittings
• Spin coupling in zigzag Wigner crystals
• Phase and amplitude response of "0.7 feature" caused by holes in silicon one-dimensional wires and rings
• Large variations in the hole spin splitting of quantum-wire subband edges
• Observation of orientation- and $k$-dependent Zeeman spin-splitting in hole quantum wires on (100)-oriented AlGaAs/GaAs heterostructures
• 0.7 Structure and Zero Bias Anomaly in Ballistic Hole Quantum Wires
• Interplay between one-dimensional confinement and crystallographic anisotropy in ballistic hole quantum wires
• Effect of spin-orbit interactions on the 0.7 anomaly in quantum point contacts
• Electronic and spin properties of hole point contacts
• Tunneling into strongly biased Tomonaga-Luttinger liquid
• Tailoring hole spin splitting and polarization in nanowires
• Hole spin relaxation in $p$-type GaAs quantum wires
• Near-thermal limit gating in heavily-doped III-V semiconductor nanowires using polymer electrolytes
• Electron spin relaxation in n-type InAs quantum wires
• High-quality quantum point contact in two-dimensional GaAs (311)A hole system
• Charge transport by modulating spin-orbit gauge fields for quasi-onedimensional holes