Circular terahertz ratchets in a two-dimensionally modulated Dirac system

被引：2

作者：

Hild, M. ^{[1
]}

Yahniuk, I. ^{[1
,2
]}

Golub, L. E. ^{[1
]}

Amann, J. ^{[1
]}

Eroms, J. ^{[1
]}

Weiss, D. ^{[1
]}

Watanabe, K. ^{[3
]}

Ganichev, S. D. ^{[1
,2
]}

Taniguchi, T. ^{[4
]}

机构：

[1] Univ Regensburg, Terahertz Ctr, D-93040 Regensburg, Germany

[2] PAS, CENTERA Labs, Inst High Pressure Phys, PL-01142 Warsaw, Poland

[3] Natl Inst Mat Sci, Res Ctr Elect & Opt Mat, 1-1 Namiki, Tsukuba 3050044, Japan

[4] Natl Inst Mat Sci, Res Ctr Mat Nanoarchitecton, 1-1 Namiki, Tsukuba 3050044, Japan

来源：

PHYSICAL REVIEW RESEARCH | 2024年 / 6卷 / 02期

基金：

欧洲研究理事会;

关键词：

FIELD-EFFECT TRANSISTORS; GRAPHENE; RADIATION; DETECTORS;

D O I：

10.1103/PhysRevResearch.6.023308

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on the observation of the circular ratchet effect excited by terahertz laser radiation in a specially designed two-dimensional metamaterial consisting of a graphene monolayer deposited on a few-layer graphene gate patterned with an array of triangular antidots. We show that a periodically driven Dirac fermion system with spatial asymmetry converts the a.c. power into a d.c. current, whose direction reverses when the radiation helicity is switched. The circular ratchet effect is demonstrated for room temperature and a radiation frequency of 2.54 THz. It is shown that the ratchet current magnitude can be controllably tuned by the patterned and uniform back gate voltages. The results are analyzed in the light of the developed microscopic theory considering electronic and plasmonic mechanisms of the ratchet current formation.

引用

页数：9

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