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arXiv 1701.01684cond-mat.mes-hall
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二维电子系统的动量和能量全分辨谱函数

Full Momentum and Energy Resolved Spectral Function of a 2D Electronic System

Joonho Jang, Heun Mo Yoo, Loren Pfeiffer, Ken West, K. W. Baldwin, Raymond Ashoori

摘要:

单粒子谱函数测量材料中的电子态密度(DOS)作为动量和能量的函数,为超导和莫特绝缘体等现象提供了核心见解。虽然扫描隧道显微镜(STM)和其他隧道方法已经提供了部分光谱信息,但到目前为止,只有角度分辨光电子能谱(ARPES)可以全面确定材料的动量和能量光谱函数。然而,ARPES仅在材料表面的电子系统上工作,并且不能在存在外加磁场的情况下工作。在这里,我们展示了一种新的方法来确定全动量和能量分辨的电子光谱函数的二维(2D)电子系统嵌入在半导体中。与ARPES相比,该技术在存在大的外部施加的磁场的情况下仍然是可操作的,并且对于具有零电导率或零电子密度的电子系统起作用。它提供了一个直接的高分辨率和高保真度的相互作用的2D电子系统的色散和动力学探针。通过确保感兴趣的系统保持在平衡条件下,我们发现了涉及电子-声子相互作用,等离子体激元,极化子和原子系统中真空拉比分裂的新型声子模拟的多体效应的微妙特征。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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