Abstracts
P1.31
Microfabrication of Multi-Slit Structures for Studies of Quasi-2
Dimensional Topological Superfluid
3
He
Tani Tomoyuki(1), Murakawa Satoshi(2), Wada Ryoma(1), Yamada Kaito(3),
Itoh Kohei(3), Mita Yoshio(4), Shirahama Keiya(1)
1) Keio University, Department of Physics, Japan
2) University of Tokyo, Cryogenics Research Center, Japan
3) Keio University, Department of Applied Physics and Physico-Informatics,
Japan
4) University of Tokyo, Department of Electrical Engineering and Information
Systems
Superfluid
3
He has been attracting much interest as a topological superfluid.
Confinement of
3
He into well-defined slit geometries enables us to perform
ultrasound experiments of topological properties, such as edge-related surface
collective (Higgs) modes, and flow experiments, such as phase slippage by
half-quantum vortices. We report fabrication of multiple micro-slit structures
through a thin Si layer of SOI chips, where the slit dimensions are
1
µ
m
×
100
µ
m
×
50
µ
m, by semiconductor processing techniques including Reactive
Ion Etchings. The method and result of our microfabrication and prospective
experiments are discussed.
P1.32
Escape Rates of Surface-State Electrons on Liquid Helium Film
Y. C. Sun(1), K. Kono(1, 2, 3)
1) RIKEN, Center for Emergent Matter Science, Wako, Japan
2) Institute of Physics, National Chiao Tung University, Hsinchu 30010, Taiwan
3) Institute of Physics, Kazan Federal University, Kazan 420008, Russia
While the escape of electrons is proposed to be a readout mechanism of a
quantum-bit on the basis of the ground and the first-excited surface-states of
electrons on liquid He, we measured the escape rates of surface-state electrons on
liquid helium film with a STM-like tip at around 1.5K. We use a microchannel
device with upper and bottom electrodes to control the initial electron density
(
≈
10
8
cm
−
2
) on the helium film surface, and the adjustable tip is placed above
the surface with tens of
µ
m distance. The electric field dependent escape rates
are presented here, and methods for detecting different rates are also developed.
38