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Title: Excitonic gap formation in pumped Dirac materials

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1355961
Grant/Contract Number:
BES E3B7
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 95; Journal Issue: 20; Related Information: CHORUS Timestamp: 2017-05-05 22:11:12; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Triola, Christopher, Pertsova, Anna, Markiewicz, Robert S., and Balatsky, Alexander V. Excitonic gap formation in pumped Dirac materials. United States: N. p., 2017. Web. doi:10.1103/PhysRevB.95.205410.
Triola, Christopher, Pertsova, Anna, Markiewicz, Robert S., & Balatsky, Alexander V. Excitonic gap formation in pumped Dirac materials. United States. doi:10.1103/PhysRevB.95.205410.
Triola, Christopher, Pertsova, Anna, Markiewicz, Robert S., and Balatsky, Alexander V. 2017. "Excitonic gap formation in pumped Dirac materials". United States. doi:10.1103/PhysRevB.95.205410.
@article{osti_1355961,
title = {Excitonic gap formation in pumped Dirac materials},
author = {Triola, Christopher and Pertsova, Anna and Markiewicz, Robert S. and Balatsky, Alexander V.},
abstractNote = {},
doi = {10.1103/PhysRevB.95.205410},
journal = {Physical Review B},
number = 20,
volume = 95,
place = {United States},
year = 2017,
month = 5
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on May 5, 2018
Publisher's Accepted Manuscript

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  • Formation processes of magnetic polarons from excitons were studied in Cd{sub 1{minus}x}Mn{sub x}Te with the Mn composition x varying from 0.02 to 0.1 by transient photoluminescence spectroscopy. Two kinds of excitonic magnetic polarons were observed. One is the magnetic polaron composed of the free exciton, which is interacting with neighboring Mn-ion spins by the exchange interaction. The other is the magnetic polaron composed of the exciton bound to the neutral donor by aligning the surrounding Mn spins. The donor bound magnetic polarons appear for x=0.02{endash}0.05 with the binding energy of 0.5{endash}1.0 meV. The free excitonic magnetic polarons arise for x=0.02{endash}0.1,more » where the binding energy of the free excitonic magnetic polaron varies in the range of 3.5-8.0 meV depending on the Mn composition. The stability of the free excitonic magnetic polaron state is confirmed by the appearance of the strong transient photoluminescence in the wide Mn composition range. {copyright} 2001 American Institute of Physics.« less
  • We have studied light matter interaction in quantum dot and exciton-polaritonic coupler hybrid systems. The coupler is made by embedding two slabs of an excitonic material (CdS) into a host excitonic material (ZnO). An ensemble of non-interacting quantum dots is doped in the coupler. The bound exciton polariton states are calculated in the coupler using the transfer matrix method in the presence of the coupling between the external light (photons) and excitons. These bound exciton-polaritons interact with the excitons present in the quantum dots and the coupler is acting as a reservoir. The Schr√∂dinger equation method has been used tomore » calculate the absorption coefficient in quantum dots. It is found that when the distance between two slabs (CdS) is greater than decay length of evanescent waves the absorption spectrum has two peaks and one minimum. The minimum corresponds to a transparent state in the system. However, when the distance between the slabs is smaller than the decay length of evanescent waves, the absorption spectra has three peaks and two transparent states. In other words, one transparent state can be switched to two transparent states when the distance between the two layers is modified. This could be achieved by applying stress and strain fields. It is also found that transparent states can be switched on and off by applying an external control laser field.« less
  • Here, the excitonic insulator phase has long been predicted to form in proximity to a band gap opening in the underlying band structure. The character of the pairing is conjectured to crossover from weak (BCS-like) to strong coupling (BEC-like) as the underlying band structure is tuned from the metallic to the insulating side of the gap opening. Here we report the high-magnetic field phase diagram of graphite to exhibit just such a crossover. By way of comprehensive angle-resolved magnetoresistance measurements, we demonstrate that the underlying band gap opening occurs inside the magnetic field-induced phase, paving the way for a systematicmore » study of the BCS-BEC-like crossover by means of conventional condensed matter probes.« less