Magnetic field induced minigap in double quantum wells

Conference · Fri Jul 01 00:00:00 EDT 1994

OSTI ID:10166560

Simmons, J A; Lyo, S K; Klem, J F ^[1]; Harff, N E ^[1]

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1. Sandia National Labs., Albuquerque, NM (United States)

We report discovery of a partial energy gap, or minigap, in strongly coupled double quantum wells (QWs), due to an anticrossing of the two QW dispersion curves. The anticrossing and minigap are induced by an in-plane magnetic field B{sub {parallel}}, and give rise to large distortions in the Fermi surface and density of states, including a Van Hove singularity. Sweeping B{sub {parallel}} moves the minigap through the Fermi level, with the upper and lower gap edges producing a sharp maximum and minimum in the low-temperature in-plane conductance, in agreement with theoretical calculations. The gap energy may be directly determined from the data.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 10166560
• Report Number(s): SAND--94-1748C; CONF-940847--1; ON: DE94015013; BR: GB0103012
• Country of Publication: United States
• Language: English

Related Subjects

661100
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CLASSICAL AND QUANTUM MECHANICS
ENERGY GAP
FERMI LEVEL
MAGNETIC FIELDS
QUANTUM MECHANICS