Experimental measurement of the intrinsic excitonic wave function.
Experimental measurement of the intrinsic excitonic wave function.
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DOI:
10.1126/sciadv.abg0192
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发表时间:
2021-04
期刊:
影响因子:
13.6
通讯作者:
Dani KM
中科院分区:
文献类型:
--
作者:
Man MKL;Madéo J;Sahoo C;Xie K;Campbell M;Pareek V;Karmakar A;Wong EL;Al-Mahboob A;Chan NS;Bacon DR;Zhu X;Abdelrasoul MMM;Li X;Heinz TF;da Jornada FH;Cao T;Dani KM
We visualize the distribution of the electron around the hole in an exciton and observe its elusive anomalous dispersion. An exciton, a two-body composite quasiparticle formed of an electron and hole, is a fundamental optical excitation in condensed matter systems. Since its discovery nearly a century ago, a measurement of the excitonic wave function has remained beyond experimental reach. Here, we directly image the excitonic wave function in reciprocal space by measuring the momentum distribution of electrons photoemitted from excitons in monolayer tungsten diselenide. By transforming to real space, we obtain a visual of the distribution of the electron around the hole in an exciton. Further, by also resolving the energy coordinate, we confirm the elusive theoretical prediction that the photoemitted electron exhibits an inverted energy-momentum dispersion relationship reflecting the valence band where the partner hole remains, rather than that of conduction band states of the electron.
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影响因子:
44.1
作者:
KOHN, W;SHERRINGTON, D
通讯作者:
SHERRINGTON, D
影响因子:
3.7
作者:
Christiansen, Dominik;Selig, Malte;Knorr, Andreas
通讯作者:
Knorr, Andreas
影响因子:
--
作者:
Mott, NF
通讯作者:
Mott, NF
影响因子:
--
作者:
Frenkel, J
通讯作者:
Frenkel, J
影响因子:
4.6
作者:
Man MK;Deckoff-Jones S;Winchester A;Shi G;Gupta G;Mohite AD;Kar S;Kioupakis E;Talapatra S;Dani KM
通讯作者:
Dani KM