期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 116, 期 14, 页码 6575-6579出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1816119116
关键词
graphene; Dirac fermion; electron optics; quantum transport
资金
- INDEX - Nanoelectronics Research Corporation
- National Institute of Standards and Technology
- Office of Naval Research (ONR) [N00014-16-1-2921]
- Lloyd Foundation
- ONR [N00014-15-1-2761]
- National Research Foundation of Korea Grant - Korean Government [2016R1A5A1008184]
- Elemental Strategy Initiative
- Creating the Seeds for New Technology, Japan Science and Technology Agency [JPMJCR15F3]
- National Research Foundation of Korea [2016R1A5A1008184] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
We present a quantum switch based on analogous Dirac fermion optics (DFO), in which the angle dependence of Klein tunneling is explicitly utilized to build tunable collimators and reflectors for the quantum wave function of Dirac fermions. We employ a dual-source design with a single flat reflector, which minimizes diffusive edge scattering and suppresses the background incoherent transmission. Our gate-tunable collimator-reflector device design enables the quantitative measurement of the net DFO contribution in the switching device operation. We obtain a full set of transmission coefficients between multiple leads of the device, separating the classical contribution from the coherent transport contribution. The DFO behavior demonstrated in this work requires no explicit energy gap. We demonstrate its robustness against thermal fluctuations up to 230 K and large bias current density up to 10(2) A/m, over a wide range of carrier densities. The characterizable and tunable optical components (collimator-reflector) coupled with the conjugated source electrodes developed in this work provide essential building blocks toward more advanced DFO circuits such as quantum interferometers. The capability of building optical circuit analogies at a microscopic scale with highly tunable electron wavelength paves a path toward highly integrated and electrically tunable electron-optical components and circuits.
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