半圆盘Galton板上的相对论石墨烯棘轮
Relativistic graphene ratchet on semidisk Galton board
摘要：
使用广泛的蒙特卡罗模拟，我们研究了数值和分析的光电效应，或棘轮，定向电子输运诱导的微波辐射上的半圆盘高尔顿板的反量子点在石墨烯。通常的二维电子气（2DEG）和石墨烯中的电子之间的比较表明，棘轮电流在非常低的温度下是相当的。然而，石墨烯中的大的平均自由程应该允许在室温下具有强的棘轮传输。此外，在石墨烯中，即使对于非偏振辐射也会出现棘轮传输。这些特性为基于室温石墨烯的微波和太赫兹辐射的灵敏光电探测器开辟了有希望的可能性。
英文摘要：
Using extensive Monte Carlo simulations we study numerically and analytically a photogalvanic effect, or ratchet, of directed electron transport induced by a microwave radiation on a semidisk Galton board of antidots in graphene. A comparison between usual two-dimensional electron gas (2DEG) and electrons in graphene shows that ratchet currents are comparable at very low temperatures. However, a large mean free path in graphene should allow to have a strong ratchet transport at room temperatures. Also in graphene the ratchet transport emerges even for unpolarized radiation. These properties open promising possibilities for room temperature graphene based sensitive photogalvanic detectors of microwave and terahertz radiation.
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