Subcycle Formation of Floquet-Bloch Bands

被引：0

作者：

Freudenstein, J. ^{[1
]}

Ito, S. ^{[2
]}

Schuler, M. ^{[3
]}

Meierhofer, M. ^{[1
]}

Schlauderer, S. ^{[1
]}

Reimann, J. ^{[2
]}

Afanasiev, D. ^{[1
]}

Kokh, K. A. ^{[4
,5
]}

Tereshchenko, O. E. ^{[4
,5
]}

Guedde, J. ^{[2
]}

Sentef, M. A. ^{[6
,7
]}

Huber, R. ^{[1
]}

Hoefer, U. ^{[1
,2
]}

机构：

[1] Univ Regensburg, Dept Phys, Univ Str 31, D-93040 Regensburg, Germany

[2] Philipps Univ Marburg, Dept Phys, Renthof 5, D-35032 Marburg, Germany

[3] Paul Scherrer Inst, Condensed Matter Theory Grp, Forsch Str 111, CH-5232 Villigen, Switzerland

[4] AV Rzhanov Inst Semicond Phys, Novosibirsk 630090, Russia

[5] VS Sobolev Inst Geol & Mineral SB RAS, Novosibirsk 630090, Russia

[6] Univ Bremen, Inst Theoret Phys, D-28359 Bremen, Germany

[7] Univ Bremen, Bremen Ctr Computat Mat Sci, D-28359 Bremen, Germany

来源：

2024 49TH INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES, IRMMW-THZ 2024 | 2024年

关键词：

Floquet states; band-structure engineering; lightwave electronics; subcycle ARPES; topological insulators; STATES;

D O I：

10.1109/IRMMW-THz60956.2024.10697707

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Floquet-Bloch states can form in solids under periodic driving of electrons. We capture their ultrafast buildup with angle-resolved photoemission spectroscopy and subcycle time resolution. For this, we drive the Dirac surface state of a topological insulator with intense mid-infrared fields. Starting with strong intraband currents, Floquet sidebands build up in a single optical cycle. Intraband acceleration simultaneously proceeds in multiple sidebands until high-energy electrons scatter into bulk states and dissipation destroys the Floquet bands. A full quantum theory describes the simultaneous occurrence of Floquet states with intraband and interband dynamics. Our results shed new light on the dynamics of Floquet states and suggest that optical band-structure engineering is possible within a single oscillation cycle of the carrier field of light.

引用

页数：2

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