Full momentum- and energy-resolved spectral function of a 2D electronic system

Autor:	Loren Pfeiffer, Ken W. West, Heun Mo Yoo, Kirk Baldwin, Raymond Ashoori, Joonho Jang
Rok vydání:	2017
Předmět:	Superconductivity Physics Electron density Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics business.industry Phonon Mott insulator FOS: Physical sciences Angle-resolved photoemission spectroscopy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Semiconductor law Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Scanning tunneling microscope 010306 general physics 0210 nano-technology business Quantum tunnelling
Zdroj:	Science. 358:901-906
ISSN:	1095-9203 0036-8075
DOI:	10.1126/science.aam7073
Popis:	The single-particle spectral function measures the density of electronic states (DOS) in a material as a function of both momentum and energy, providing central insights into phenomena such as superconductivity and Mott insulators. While scanning tunneling microscopy (STM) and other tunneling methods have provided partial spectral information, until now only angle-resolved photoemission spectroscopy (ARPES) has permitted a comprehensive determination of the spectral function of materials in both momentum and energy. However, ARPES operates only on electronic systems at the material surface and cannot work in the presence of applied magnetic fields. Here, we demonstrate a new method for determining the full momentum and energy resolved electronic spectral function of a two-dimensional (2D) electronic system embedded in a semiconductor. In contrast with ARPES, the technique remains operational in the presence of large externally applied magnetic fields and functions for electronic systems with zero electrical conductivity or with zero electron density. It provides a direct high-resolution and high-fidelity probe of the dispersion and dynamics of the interacting 2D electron system. By ensuring the system of interest remains under equilibrium conditions, we uncover delicate signatures of many-body effects involving electron-phonon interactions, plasmons, polarons, and a novel phonon analog of the vacuum Rabi splitting in atomic systems.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a4f556547e3d77159657ead4ffc8560b https://doi.org/10.1126/science.aam7073 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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