3 research outputs found
Observation of a Helical Luttinger-Liquid in InAs/GaSb Quantum Spin Hall Edges
We report on the observation of a helical Luttinger-liquid in the edge of
InAs/GaSb quantum spin Hall insulator, which shows characteristic suppression
of conductance at low temperature and low bias voltage. Moreover, the
conductance shows power-law behavior as a function of temperature and bias
voltage. The results underscore the strong electron-electron interaction effect
in transport of InAs/GaSb edge states. Because of the fact that the Fermi
velocity of the edge modes is controlled by gates, the Luttinger parameter can
be fine tuned. Realization of a tunable Luttinger-liquid offers a
one-dimensional model system for future studies of predicted correlation
effects.Comment: 23 pages, 9 figure
A new type of carbon resistance thermometer with excellent thermal contact at millikelvin temperatures
Using a new brand of commercially available carbon resistor we built a
cryogenic thermometer with an extremely good thermal contact to its thermal
environment. Because of its superior thermal contact the thermometer is
insensitive to low levels of spurious radio frequency heating. We calibrated
our thermometer down to 5mK using a quartz tuning fork He-3 viscometer and
measured its thermal resistance and thermal response time.Comment: 5 pages, 4 figure