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Long-living excited states of a 2D diamagnetic exciton

Journal Article · · Solid State Communications
 [1];  [2]
  1. Univ. of Utah, Salt Lake City, UT (United States); OSTI
  2. Univ. of Utah, Salt Lake City, UT (United States)
+ Show Author Affiliations

Hydrogenic excited states of a 2D exciton are degenerate. In the presence of a weak magnetic field, the -states with a zero momentum of the center of mass get coupled to the -states with finite momentum of the center of mass. This field-induced coupling leads to a strong modification of the dispersion branches of the exciton spectrum. Namely, the lower branch acquires a shape of a “mexican hat” with a minimum at a finite momentum. At certain magnetic field, exciton branches exhibit a linear crossing, similarly to the spectrum of a 2D electron in the presence of spin–orbit coupling. While spin is not involved, degenerate and states play the role of the spin projections. Lifting of degeneracy due to diamagnetic shifts and deviation of electron–hole attraction from purely Coulomb suppresses the linear crossing.

Research Organization:
Univ. of Utah, Salt Lake City, UT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-06ER46313
OSTI ID:
1977667
Alternate ID(s):
OSTI ID: 1825573
Journal Information:
Solid State Communications, Journal Name: Solid State Communications Journal Issue: C Vol. 341; ISSN 0038-1098
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Mexican hat
Physics
S-P degeneracy
diamagnetic shift
magneto-exciton