Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session Q45: Advances in Detectors and Their Electronics
3:00 PM–5:36 PM,
Wednesday, March 8, 2023
Room: Room 315
Sponsoring
Unit:
GIMS
Chair: Angela Di Fulvio, University of Illinois - Urbana Champaign
Abstract: Q45.00004 : Positron Charge Sensing Using Two-Dimensional Materials*
3:36 PM–3:48 PM
Presenter:
Paz Or
(The Hebrew University of Jerusalem)
Authors:
Paz Or
(The Hebrew University of Jerusalem)
Omer Kotlovsky
(The Hebrew University of Jerusalem)
Devidas T R
(Hebrew University of Jerusalem)
Matan Hadad
(The Hebrew University of Jerusalem)
Roi Abir
(The Hebrew University of Jerusalem)
Takashi Taniguchi
(National Institute for Materials Science)
Kenji Watanabe
(National Institute for Materials Science)
Iris Sabo-Napadensky
(Soreq NRC)
Sharon May-Tal Beck
(Physics department, NRCN)
Guy Ron
(Hebrew University of Jerusalem)
Hadar Steinberg
(Hebrew University of Jerusalem)
We utilized a high-mobility double-gated graphene field-effect transistor to measure the accumulated charge created by positron annihilation in its back-gate. I will describe the use of graphene devices under DC, reaching a positron current sensitivity of 1.2 fA/√Hz, <!--[if gte msEquation 12]> lang=EN-US style='font-size:12.0pt;font-family:"Cambria Math",serif;
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mso-bidi-theme-font:major-bidi;mso-ansi-language:EN-US'> style='mso-bidi-font-style:normal'>Hz detected over 20 min [1]. I will also describe our RF devices, reaching a sensitivity of 0.01 fA/√Hz, corresponding to ~100 positrons/sec. In these RF graphene-based devices, the graphene is coupled to a waveguide and is integrated as an RF resonator, where annihilation events are detected through changes in the graphene RF reflection coefficient S11. It is designed for charge-detection of positrons in micro-second time-resolution, aiming to detect single positron annihilation events. Using a table-top 22Na positron source, we demonstrate the utility of two-dimensional layered materials as probes for the charging dynamics of positrons in solids. In the future, we intend to integrate these devices inside the SPOT-IL slow positron beam [3, 4], built at the Hebrew University of Jerusalem.
*Devices for this study were fabricated at the Center for Nanoscience and Nanotechnology, the Hebrew University. Funding for this work was provided by the IAEC through Pazy grant 328/20, and by the Israel Science Foundation grant 861/19. P.O is supported by a fellowship by the ministry of science and technology, Israel. T.R.D. acknowledges support from the Lady Davis Postdoctoral Fellowship program. K.W. and T.T. acknowledge sup-port from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant Number JPMXP0112101001) and JSPS KAKENHI (Grant Numbers JP19H05790 and JP20H00354).
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