Probing free-carrier and exciton dynamics in a bulk semiconductor with two-dimensional electronic spectroscopy

被引：3
|
作者：
Allerbeck, Jonas [1 ,2 ]
Deckert, Thomas [1 ]
Spitzner, Laurens [2 ]
Brida, Daniele [1 ,2 ]
机构：
[1] Univ Luxembourg, 162a,Ave Faiencerie, L-1511 Luxembourg, Luxembourg
[2] Univ Konstanz, Univ Str 10, D-78457 Constance, Germany
来源：
PHYSICAL REVIEW B | 2021年 / 104卷 / 20期
关键词：
OPTICAL-PROPERTIES; GASE; GALLIUM; TRANSITIONS;
D O I：
10.1103/PhysRevB.104.L201202
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We employ partially collinear two-dimensional electronic spectroscopy to disentangle precisely the ultrafast dynamics of excitons and free carriers in gallium selenide. Femtosecond temporal and meV energy resolution in the visible spectral region allows us to observe ultrafast bleaching at the exciton resonance with a relaxation time of 112 fs that corresponds to the thermal dissociation of excitons at room temperature, and is orders of magnitude faster than carrier relaxation in the bulk crystal. Our method is applicable to other functional materials, two-dimensional systems, and nanostructures.
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页数：6
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